DEN - LHR

£315 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 15/9. 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
£574
Typical prices: £772-£496
Icelandair
Wed 26/8Sat 12/12
DEN - LHR • 1 stop
Cheapest direct flights
£587
Typical prices: £610-£460
British Airways
Tue 20/10Tue 27/10
DEN - LHR • Direct
Advice from real travellers
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
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Expert advice
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Top airlines
Cheapest • from £574 (return)
Best reviews • 7.4 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Direct flights
You can fly direct with British Airways and United Airlines. Average duration is 9h 05m
Direct flights
Direct flights
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Direct flights
Direct flights
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Avoid delays
Most punctual • 87% on-time
Best time • Fewest delays
Insights
Insights
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Insights
Top stopover airports
Cheapest • Avg £473 (return)
Shortest trip • 11h 10m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 14% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 17% price drop
Most popular
Good to know
Good to know
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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

Wed, 26 Aug - Sat, 12 Dec
Icelandair Logo
20:10 - 11:55
DEN
-
LHR
32h 45m
1 stop
Icelandair Logo
12:15 - 18:05
LHR
-
DEN
12h 50m
1 stop
£574Icelandair
Sat, 1 Aug - Thu, 20 Aug
Icelandair Logo
16:40 - 11:55
DEN
-
LHR
12h 15m
1 stop
Icelandair Logo
21:25 - 12:40
LHR
-
DEN
22h 15m
1 stop
£577Icelandair
Wed, 13 May - Tue, 19 May
Icelandair Logo
16:40 - 20:20
DEN
-
LHR
20h 40m
1 stop
Icelandair Logo
21:25 - 19:00
LHR
-
DEN
28h 35m
1 stop
£579Icelandair
Sun, 23 Aug - Mon, 31 Aug
Icelandair Logo
16:40 - 11:55
DEN
-
LHR
12h 15m
1 stop
Icelandair Logo
13:05 - 19:00
LHR
-
DEN
12h 55m
1 stop
£579Icelandair
Tue, 20 Oct - Tue, 27 Oct
British Airways Logo
18:35 - 10:35
DEN
-
LHR
9h 00mdirect
British Airways Logo
12:25 - 16:30
LHR
-
DEN
10h 05mdirect
£587British Airways
Mon, 19 Oct - Wed, 21 Oct
Air Canada Logo
05:00 - 11:50
DEN
-
LHR
23h 50m
2 stops
Air Canada Logo
11:05 - 10:31
LHR
-
DEN
54h 26m
2 stops
£590Air Canada
Thu, 27 Aug - Mon, 31 Aug
Icelandair Logo
16:40 - 11:55
DEN
-
LHR
12h 15m
1 stop
Icelandair Logo
13:05 - 19:00
LHR
-
DEN
12h 55m
1 stop
£591Icelandair
Wed, 26 Aug - Mon, 31 Aug
Icelandair Logo
20:10 - 11:55
DEN
-
LHR
32h 45m
1 stop
Icelandair Logo
13:05 - 19:00
LHR
-
DEN
12h 55m
1 stop
£593Icelandair
Mon, 19 Oct - Wed, 21 Oct
Air Canada Logo
12:05 - 13:20
DEN
-
LHR
18h 15m
1 stop
Air Canada Logo
11:05 - 18:46
LHR
-
DEN
38h 41m
2 stops
£594Air Canada
Mon, 20 Jul - Mon, 31 Aug
Icelandair Logo
16:40 - 20:20
DEN
-
LHR
20h 40m
1 stop
Icelandair Logo
13:05 - 19:00
LHR
-
DEN
12h 55m
1 stop
£595Icelandair
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.

How much is a return flight from Denver to London Heathrow Airport?

This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from Denver to London Heathrow Airport departing in August.

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 Monday. On your return trip to Denver, you should consider flying back on a Thursday, and avoid Sundays 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 September, where tickets cost £491 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £870 and £754 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.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £540 on average.

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 14% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 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.

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.

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.

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.

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.

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

Low seasonJanuary
Cheapest flight£315
Best time to beat the crowds (14% less expensive on average)
Most popular time to fly and prices are also 18% lower 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 
DarleneFlew with British Airways
DEN
-
LHR
Mar 2026
Plan on a crazy, crowded experience in terminal 3! Find a resturarant to camp in to remove yourself from the pandamonium
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 £315 for a one-way ticket and £574 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?

    American Airlines, and United 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 Airbus A350-1000 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 Lufthansa?

    The two airlines most popular with KAYAK users for flights from Denver to London are United Airlines and Lufthansa. With an average price for the route of £612 and an overall rating of 7.4, United Airlines is the most popular choice. Lufthansa is also a great choice for the route, with an average price of £741 and an overall rating of 6.8.

  • 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 £381 or less one-way and £686 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 3 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 9677 reviews
8.1Crew
6.6Food
7.7Boarding
7.3Comfort
7.1Entertainment
Airline reviews

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

8.0 ExcellentAnonymous, Apr 2026
DEN - IAD
Read more United Airlines reviews

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

Really hard landing... as in slammed into the runway then hit the brakes really hard ...

Putting people that close to the bathroom, where you have to look into the bathroom as people are exiting and entering was not great and the smell was also not great. I know the airlines are desperate for more chairs, but that seat is a crime.

Every staff member was professional, friendly and courteous. The pizza twist was ok. It was warm but too much dough.

one staffer was frustrated (it happen); the flight was late and the pilot mentioned they'll make amend but the snacks were the same, other than that the aircraft was clean and everything went smooth, no complaints

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

No seat back entertainment. And app had a hard time getting entertainment loaded.

ticket agent lady wás very helpful , she arranged wheel chair for my elderly mother

Flight left on time and we arrived 25 minutes early! There was a gate available when we arrived so early on a busy Sunday afternoon! Flight attendants came around twice with the drinks cart.

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.

Flight was delayed by several hours and then cancelled due to weather. But Staff was very helpful getting me on a different flight. United should offer food coupons and tooth brush and paste for stranded passengers

I upgraded to the business class cabin. It was the poorest business class I have ever experienced. No access to any business lounge in Tampa airport. Seats are not comfortable. I had a window seat and had to step/crawl over the next seat. Food was mediocre and service below average for business class. Bathroom location was ridiculous. No place to wait. I cannot believe I paid this kind of money and will never fly Lufthansa Discover again. They really should reimburse me somehow.

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Was never allowed on and not refunded the full amount of the ticket plus charged a $300 processing fee.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

Flights were delayed and due to a checked hand luggage bag by an overzealous gate agent in Berlin I missed my ground connection costing me another £80. Food was cold and bland, I honestly expect better from a national carrier operating out of one of their major hubs.

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Very good, i got two seats for myself, and was comfortable with the blanket i got

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.

Food is too little (in volume) and too spicy.. There are no snacks in the back of the plane in between meals.

Boarding was orderly, pilot and flight attendants were nice, entertainment options were good, and low sodium meals were quite tasty.

The whole experience was excellent, O can say out from Miami the best airline to travel with for any European destination. Since the ground staff to the inflight crew attention was great, service on board 10 of 10. Finally the 380 is very confortable and nice to travel.

All crew except 1 were excellent. When I asked assistance with business class seat conversion to a bed (not being familiar as never used before but have numerous times with other airlines) crew member helped very reluctantly. I should have told her that business class seat conversion is totally different in each airline such as Delta, New Zealand Air and United. Sorry it was my 1st time with America Airlines. Now I know, I won't bother asking assistance in future.

The seats in Premier Economy were very comfortable. The food was better than average. The way British Airways handled our seating was atrocious.

Flight delayed, connection was not at gate listed and so missed, staff were rude at Heathrow, phone tree stupid and difficult, took me 21 actual hours to reach my destination. Almost lost my hotel reservation after walking in a strange city alone after midnight because they would not put me up in a hotel at sfo or heathrow. I will never fly BA again and will tell all people and Instagram followers never to fly BA.

Overall ok. Best part has always been the sundae dessert.

I’ve never been on a trans-Atlantic (or Pacific) flight where the seats don’t recline—not even a little. I asked my seat mate when BA starting doing this and he said “Oh, a few years ago.” I couldn’t sleep, with my head falling forward waking me continuously, and came off the plane incredibly stiff. I booked a Premium Economy seat to get a more comfortable seat, which was worse than most basic Economy seats I’ve ever booked.

Nice aircraft. Good crew. Delayed departure from Houston, but arrived on time in London. Main thing I don’t like about flying BA is having to transit through security in London Heathrow. A major pain!

The gate agent made me check my carry-on in Denver, even though I've traveled all over taking this case on the plane. Beware folks. Food in Premium Economy was quite good - excellent blanket! Flight attendants on the Heathrow-to-Budapest flight on 3-27-2026 were quite snappy. I got a frown when asked to unscrew the water bottle cap for me (I had a cast on my right arm). Also woke up right when they were handing out biscuits. She had given my rowmates one and was in the process of giving water when I asked for a biscuit. She scolded me and said, "You snooze, you lose". She did give me one, but I thought that comment was uncalled for.

Wish the food and overall service was better. They treat Business class passengers same as economy

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

Information on your arrival and departure airports