DEN - LHR

£198 Find Cheap Flights from Denver to London Heathrow Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Heathrow departing on 4/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to London, as well as popular online travel agencies
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Everything you should know

Cheapest return fare
£437
Overall average: £503
Multiple Airlines
Mon 2/3Mon 9/3
DEN - LHR • 2 stops
Cheapest direct flights
£464
Typical prices: £464-£643
British Airways
Sun 1/3Wed 18/3
DEN - LHR • Direct
Our travellers' advice
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
BA's economy includes a free cabin bag, avoiding fees.
Expect long walks at Heathrow's terminals after landing.
Expert advice
Expert advice
+1
+1
Expert advice
Expert advice
+1
Top airlines
Icelandair
Cheapest • from £440 (return)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 12% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 15% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Denver to Heathrow (DEN-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Denver to Heathrow that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Denver to Heathrow

Mon, 2 Mar - Mon, 9 Mar
Multiple Airlines Logo
15:40 - 21:20
DEN
-
LHR
22h 40m
2 stops
Multiple Airlines Logo
06:40 - 19:05
LHR
-
DEN
18h 25m
2 stops
£437Multiple Airlines
Sun, 8 Mar - Wed, 18 Mar
Multiple Airlines Logo
08:05 - 11:50
DEN
-
LHR
21h 45m
1 stop
Multiple Airlines Logo
07:40 - 15:35
LHR
-
DEN
13h 55m
1 stop
£439Multiple Airlines
Sun, 15 Feb - Thu, 19 Feb
Icelandair Logo
15:40 - 10:50
DEN
-
LHR
12h 10m
1 stop
Icelandair Logo
12:15 - 18:05
LHR
-
DEN
12h 50m
1 stop
£440Icelandair
Sun, 15 Feb - Thu, 26 Feb
Icelandair Logo
15:40 - 19:30
DEN
-
LHR
20h 50m
1 stop
Icelandair Logo
12:15 - 18:05
LHR
-
DEN
12h 50m
1 stop
£440Icelandair
Sun, 15 Feb - Thu, 19 Feb
Icelandair Logo
15:40 - 19:30
DEN
-
LHR
20h 50m
1 stop
Icelandair Logo
12:15 - 18:05
LHR
-
DEN
12h 50m
1 stop
£441Icelandair
Mon, 6 Apr - Tue, 28 Apr
Icelandair Logo
16:40 - 20:20
DEN
-
LHR
20h 40m
1 stop
Icelandair Logo
21:25 - 19:00
LHR
-
DEN
28h 35m
1 stop
£442Icelandair
Tue, 10 Mar - Wed, 18 Mar
Multiple Airlines Logo
16:40 - 18:50
DEN
-
LHR
20h 10m
3 stops
Multiple Airlines Logo
06:40 - 19:05
LHR
-
DEN
18h 25m
2 stops
£443Multiple Airlines
Mon, 9 Mar - Mon, 16 Mar
Multiple Airlines Logo
17:20 - 15:50
DEN
-
LHR
16h 30m
1 stop
Multiple Airlines Logo
06:50 - 19:55
LHR
-
DEN
19h 05m
2 stops
£443Multiple Airlines
Sun, 1 Mar - Wed, 18 Mar
Lufthansa Logo
17:45 - 16:50
DEN
-
LHR
16h 05m
1 stop
Lufthansa Logo
06:35 - 15:35
LHR
-
DEN
15h 00m
1 stop
£444Lufthansa
Fri, 27 Feb - Fri, 6 Mar
Icelandair Logo
15:40 - 10:50
DEN
-
LHR
12h 10m
1 stop
Icelandair Logo
12:15 - 18:05
LHR
-
DEN
12h 50m
1 stop
£445Icelandair
Booking Insights

KAYAK's insights & trends for Denver to Heathrow flights

Get data-powered insights and trends into flights from Denver to Heathrow to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Denver to London Heathrow Airport?

The average price of all round-trip flights from Denver to London Heathrow Airport clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to London Heathrow Airport on a Wednesday and more expensive on a Saturday. On your return trip to Denver, you should consider flying back on a Wednesday, and avoid Saturdays for better deals.

What is the cheapest month to fly from Denver to London Heathrow Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Denver to London Heathrow Airport is October, where tickets cost £482 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £833 and £721 respectively.

Can I save money by flying with a stopover from Denver to London Heathrow Airport?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of £515, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from Denver to London Heathrow Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Denver to London Heathrow Airport, you should book around 2 weeks before departure, which saves you about 12% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

Expert advice

Expert advice for your flight from Denver to Heathrow

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on Finnair

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Stefanie Waldek

Stefanie Waldek

Expert on United Airlines

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or out at sea, likely en route to Antarctica or the Arctic.

Jessica Macdonald

Jessica Macdonald

Expert on Lufthansa

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has travelled to more than 50 countries across six continents.

Duncan Madden

Duncan Madden

Expert on British Airways

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Marisa Garcia

Marisa Garcia

Expert on Iberia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialising in airline interiors and regulations. 10 years ago, she pivoted to journalism. She shares her insights in leading aviation, travel and business publications and on her site, FlightChic.

Good to know - Cheap tickets from Denver to London Heathrow Airport

Low seasonJanuary
Cheapest flight£198
Best time to beat the crowds (12% less expensive on average)
Most popular time to fly (20% more expensive on average)
Flight from Denver to London Heathrow Airport

When to book flights from Denver to Heathrow

Are your dates flexible? Find out the best times to travel from Denver to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Denver to Heathrow: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Denver to Heathrow 
Verified travelerFlew with British Airways
DEN
-
LHR
Dec 2025
Jst take one cashing bag no checked luggage-so much easier
TressaFlew with Lufthansa
DEN
-
LHR
Dec 2024
Make your layover longer because you will need it for all the walking at Heathrow
Verified travelerFlew with Iberia
DEN
-
LHR
Sept 2024
Coming from Denver with London as a layover you will have to go through security again

FAQs for booking Denver to London Heathrow Airport flights

  • What is the cheapest flight from Denver to London Heathrow Airport?

    In the last 3 days, the lowest price for a flight from Denver to London Heathrow Airport was £198 for a one-way ticket and £437 for a return.

  • Which airports will I be using when flying from Denver to London Heathrow Airport?

    On your way to London Heathrow Airport, you’ll fly out from Denver Intl. You’ll be landing at London Heathrow.

  • Which airlines offer Wi-Fi service onboard planes from Denver to London Heathrow Airport?

    Iberia, Lufthansa, United Airlines, and American Airlines offer inflight Wi-Fi service on the Denver to London Heathrow Airport flight route.

  • Which aircraft models fly most regularly from Denver to London Heathrow Airport?

    The Boeing 787 Dreamliner is the aircraft model that flies most regularly on the Denver to London Heathrow Airport flight route.

  • Which airline alliances offer flights from Denver to London Heathrow Airport?

    oneworld, and Star Alliance are the airline alliances operating flights between Denver and London Heathrow Airport, with oneworld being the most commonly used for this route.

  • On which days can I fly direct from Denver to London Heathrow Airport?

    There are direct flights from Denver to London Heathrow Airport on a daily basis.

  • Which is the best airline for flights from Denver to London, United Airlines or Iberia?

    The two airlines most popular with KAYAK users for flights from Denver to London are United Airlines and Iberia. With an average price for the route of £557 and an overall rating of 7.4, United Airlines is the most popular choice. Iberia is also a great choice for the route, with an average price of £500 and an overall rating of 7.0.

  • How does KAYAK find such low prices on flights from Denver to London Heathrow Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Denver to London Heathrow Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Denver to London Heathrow Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Denver is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Denver to London Heathrow Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London Heathrow Airport with an airline and back to Denver with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Denver to London Heathrow Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Denver to London Heathrow Airport

  • Looking for a cheap flight from London Heathrow Airport to Denver? 25% of our users found flights on this route for £189 or less one-way and £444 or less round-trip.

Prefer to fly direct from Denver to London Heathrow Airport?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Denver Intl to London Heathrow.
Find which airlines fly direct from Denver Intl Airport to London Heathrow Airport, which days they fly and book direct flights.

Direct departures

Denver Intl to London Heathrow

Monday

British Airways, United Airlines

British Airways, United Airlines

Tuesday

British Airways, United Airlines

British Airways, United Airlines

Wednesday

British Airways, United Airlines

British Airways, United Airlines

Thursday

British Airways, United Airlines

British Airways, United Airlines

Friday

British Airways, United Airlines

British Airways, United Airlines

Saturday

British Airways, United Airlines

British Airways, United Airlines

Sunday

British Airways, United Airlines

British Airways, United Airlines

See more direct flights

Direct returns

London Heathrow to Denver Intl

Monday

British Airways, United Airlines

British Airways, United Airlines

Tuesday

British Airways, United Airlines

British Airways, United Airlines

Wednesday

British Airways, United Airlines

British Airways, United Airlines

Thursday

British Airways, United Airlines

British Airways, United Airlines

Friday

British Airways, United Airlines

British Airways, United Airlines

Saturday

British Airways, United Airlines

British Airways, United Airlines

Sunday

British Airways, United Airlines

British Airways, United Airlines

See more direct flights

Reviews of the top 4 airlines flying from Denver to Heathrow

 
See real verified KAYAK customer reviews for airlines flying from Denver to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to Heathrow? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9219 reviews
6.6Food
7.7Boarding
7.3Comfort
7.1Entertainment
8.1Crew
Airline reviews

Some flight attendants were great others were cranky. Seats were very tight and sitting on an aisle was very hard as the carts and people walking constantly bumped shoulder and arm.

10.0 ExcellentTrish, Jan 2026
SFO - LHR
Read more United Airlines reviews

Some flight attendants were great others were cranky. Seats were very tight and sitting on an aisle was very hard as the carts and people walking constantly bumped shoulder and arm.

Sitting on the runway after we land for almost two hours! Not sure if we should blame United or Just Dumpy Vance.

Flight was late - I was downgraded from first class to coach

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

Great smooth flight. Had a seating change, but that was an improvement. Thanks United Airways Crew.

Flight was good but there are way to many announcements for credit cards etc.

Crew seemed a bit cranky. No seatback screens. But boarding was efficient and on time and we arrived early.

See previous note about the passenger in Denver who threw my husband's bag out of the overhead bin in order to maker room for his own. And the flight attendant back up the new passenger.

Terrible. They wouldn't allow me on my flight on the 14th..

Although the flight was delayed the crew and the flight itself were very good. Couldn't fault anything and after the disappointment of being abandoned in the US by BA it was a welcome relief to travel with United

The boarding procedure got confusing because they wanted to weigh everyone’s carry-on. Apparently mine was 3 1/2 kg over their limit. I didn’t know they had a limit. And at the check-in desk, nothing was said about this. They wanted me to check the carry-on at no charge and that would have been fine except then they told me at my connection in London I would have to go outside to baggage claim retrieve my bag, and then recheck it. In other words, they could not check it to my final destination, only to London. I told him this was unacceptable so after a few minutes of discussion, they came back and said that my bag would be OK to carry on the plane. It seems that if you have a connection then the weight is not as important. Then when I actually went to board the boarding agent said I needed a tag indicating that my bag had been weighed, even though she had just five minutes ago talked to the same person who cleared me. Lots of confusion seems like a very bad process. They need to improve this.

My flight being automatically moved messed up my travel plans, and I had to quickly find an alternative mode of transportation. I couldn’t get a refund from any of the companies involved. Kayak, Ibiza, or Vueling. I am still unsure of how to settle my concern.

Plane delayed due to weather. Plane boarded, then told to unboard due to a maintenance issue.

the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

The staff was very nice and helpful. Some of the best crew I have met.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

Was all good.l including a sofdrink. AA improved significantly. There was no entertainment.

I've taken British Airways before and it has been great. On this trip to Spain and Portugal we had two BA flights. On both flights we were taken by bus from the terminal out to the plane on the tarmac. There were many older folks on these flights, and to ask people in their 70s to lug their carry-on and personal items up the long mobile staircase to the plane entrance, is very disturbing. I won't be taking British Airways in the future. Many people on these flights were very unhappy.

The food on the flight was of marginal quality. Small bits of chicken, instant mashed potatoes and some carrots. The rolls were very dry, nearly inedible. The seats were quite small and didn’t allow for any shifting of position during the flight. There was limited leg room.0

Service and food were excellent. Incredibly friendly and competent staff. Flight was delayed over and hour and I had to run between terminals to get my connecting flight.

Missed it by a couple minutes and couldn’t find an alternative flight so had to spend the night in DC and after much shuffling from 1 airline to another managed to get a United to Frankfurt.

There were only 2 toilets and one of them did not work in business class. We are not allowed to cross classes so had to wait in line to use the toilets!! The entertainment touch display was finicky and did not work all the time.

We missed our flight. There was not enough time built into the layover to get through immigration, customs, bagclaim, bag rechecking, and the long trip to another terminal and gate. Kayak really screwed up. We took the bus up to Wisconsin and then were picked up in Brookfield by private car. It was lucky we didnt miss the last bus out.

I tried both on line and by calling the Customer Service line to arrange for a special meal as i have food intolerances. I was under the impression from your service representative that I was successful. I was not. I cannot eat spicy foods and get very ill if i eat bell peppers. I could not eat either menu choice and no special meal was actually ordered. ( your representative tried to order it for a flight that did not have meal service!!! - found this out later). Your wonderful cabin crew managed to put together a fruit, salad, roll and cheese tray for me so I had something to eat. WHY WOULD YOU SERVE SPICY FOOD, WITH NO MILDER OPTION,ON AN INTERNATIONAL FLIGHT???

Crew was professional and great, flight was clean. However food was pathetic. I ordered a Hindu meal assuming no meat but they served chicken. Need to be very specific- Hindu meal should be categorize as Vegetarian - no meat or egg. Or it should be specific that we are serving meat.

Late flight Delays Poor service Poor staff Worst airline ever

Ground staff and cabin crew were excellent. Flight was perfectly on time. Zero issues.

Even after a delay, getting off the ground, thanks for keeping me safe, the airline made certain that my connecting flight was rebooked to get me to my final destination. It was actually rebooked twice, and my luggage still managed to meet me. The airline gave me a credit for food and beverage to be used at the airport vendors, regretfully, the credit did not transfer to my final boarding pass. Oh, well…

A bit more space? Not practical, I know. I felt squished in but part of that could have been the man sitting next to me.

The issue was not with BA it was with the link yoiu sent fopr booking the flight

Loved the boarding option from Business class lounge, experience on flight was excellent, plenty of good food choices

The airline was not clear about a new departure time so we got to the airport early anyway. The flight left early which was great because of weather. The check in process was very easy and staff were friendly and helpful. The crew was great and our flight was very good.

Awful it always is unfortunately is the only way to fly direct to london

I travelled in business class and was disappointed by lack of service, curt and borderline rude time of the crew and to top it off, all of my luggage was delayed. It was like pulling teeth to even report the missing luggage and recover it the next day from the airport.

Boarding was poor. All groups called immediately one after the other resulting in a long queue in the jetty/jet bridge. Seats were very hard and and did not recline on a 4.5 hour flight. No food was available. Plane was cold. There was no entertainment.

The cramped seats are cruel and unusual punishment and may violate the Geneva code.

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

The flight was excellent in World Travellor plus. Well worth the extra money. Boarding at Phoenix was the usual poorly organized event. Very stressful.

Although business class, the seating was really cramped. The food was so so.

Everything you need to know for your flight from Denver to Heathrow

Information on your arrival and departure airports