DEN - LHR

£92 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 19/12. 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
£691
Typical prices: £463-£652
Icelandair
Wed 21/10Sun 1/11
DEN - LHR • 1 stop
Cheapest direct flights
£692
Typical prices: £484-£684
Lufthansa
Sun 16/8Tue 1/9
DEN - LHR • Direct
Advice from real travellers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
At Heathrow Terminal 3, expect crowds; a restaurant can offer a calmer wait.
Packing only a carry-on can make Heathrow transfers and extra security easier.
Expert advice
Expert advice
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Expert advice
Expert advice
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Top airlines
Cheapest • from £691 (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 01m
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
Insights
Insights
Top stopover airports
Cheapest • Avg £484 (return)
Shortest trip • 11h 10m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 19% price drop
Most popular
Good to know
Good to know
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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, 21 Oct - Sun, 1 Nov
Icelandair Logo
16:40 - 11:55
DEN
-
LHR
12h 15m
1 stop
Icelandair Logo
12:15 - 18:05
LHR
-
DEN
12h 50m
1 stop
£691Icelandair
Sat, 10 Oct - Sat, 17 Oct
United Airlines Logo
23:59 - 21:20
DEN
-
LHR
14h 21m
1 stop
United Airlines Logo
09:30 - 15:40
LHR
-
DEN
13h 10m
1 stop
£692United Airlines
Mon, 3 Aug - Wed, 19 Aug
Multiple Airlines Logo
17:35 - 09:40
DEN
-
LHR
9h 05mdirect
Multiple Airlines Logo
06:55 - 13:45
LHR
-
DEN
13h 50m
1 stop
£693Multiple Airlines
Wed, 9 Sep - Wed, 16 Sep
Multiple Airlines Logo
20:30 - 12:35
DEN
-
LHR
9h 05mdirect
Multiple Airlines Logo
06:55 - 13:45
LHR
-
DEN
13h 50m
1 stop
£695Multiple Airlines
Thu, 1 Oct - Wed, 7 Oct
Delta Logo
11:00 - 07:10
DEN
-
LHR
13h 10m
1 stop
Delta Logo
10:45 - 17:30
LHR
-
DEN
13h 45m
1 stop
£695Delta
Wed, 12 Aug - Wed, 19 Aug
United Airlines Logo
20:35 - 12:35
DEN
-
LHR
9h 00mdirect
United Airlines Logo
07:25 - 18:50
LHR
-
DEN
18h 25m
1 stop
£696United Airlines
Fri, 21 Aug - Tue, 25 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
£697Icelandair
Mon, 31 Aug - Tue, 8 Sep
United Airlines Logo
23:59 - 05:55
DEN
-
LHR
22h 56m
1 stop
United Airlines Logo
06:55 - 13:45
LHR
-
DEN
13h 50m
1 stop
£698United Airlines
Tue, 22 Sep - Sun, 4 Oct
Finnair Logo
18:40 - 10:35
DEN
-
LHR
8h 55mdirect
Finnair Logo
08:55 - 17:39
LHR
-
DEN
15h 44m
1 stop
£698Finnair
Tue, 8 Sep - Wed, 23 Sep
Air Canada Logo
11:25 - 06:30
DEN
-
LHR
12h 05m
1 stop
Air Canada Logo
08:40 - 18:46
LHR
-
DEN
17h 06m
2 stops
£699Air Canada
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 October.

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 October, where tickets cost £515 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £996 and £849 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 £946, 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 1 week before departure. For the absolute cheapest price, our data suggests you should book 9 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£92
Best time to beat the crowds (18% less expensive on average)
Most popular time to fly and prices are also 19% 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 £92 for a one-way ticket and £691 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?

    United Airlines, Lufthansa, 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 787-9 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 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 £657 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 £757 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 £609 or less one-way and £954 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 9882 reviews
7.1Entertainment
7.7Boarding
7.3Comfort
6.6Food
8.1Crew
Airline reviews

Very easy ! Use the kiosk and bag drop and right to security within 10 min

10.0 ExcellentJoanne, Jun 2026
DEN - ORD
Read more United Airlines reviews

Very easy ! Use the kiosk and bag drop and right to security within 10 min

The entertainment they offer could use some games, and maybe they could add some cookies to the snack menu. And the automated messages are a bit repetitive. But it was comfortable temperature wise and the seats were comfortable. The crew is very polite and helpful

This planes staff was top tier. Everything went great and had a great flight home.

Destroyed my suitcase. Tired of talking about it. Cancelling my unite mileage plus account.

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

It was a short flight so I was expecting too much

Had a one hour delay due to mechanical issue. I didn’t think I’d be able to make my connecting flight, but they waited for me and greeted me when I arrived to help things run smooth.

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

Cree was organized and pleasant. Plane had good seating but as it’s a shuttle toilets hadn’t been thoroughly cleaned (eg. bins too full)

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

The flight was cancelled, so why are you asking me how the flight was?

We sat in our seats on the tarmac for almost 3 hours due to storms. They would not give us water or a snack. We were to depart at 7.30 pm and it was about 10.30 when we took off. No dinner until much after that. Beef type noodle dish was terrible with about a teaspoon of beef in it. The breakfast sweet waffle with egg and sausage inside was horrible. An English muffin sandwich would have been much better. Food was the worst in all of our years of traveling the world.

Our screen kept turning off ...3 times...had to get crew attention to turn it on again

They messed up my seat so I didn’t get the one I paid for

Put me on standby; flight was late; missed my connecting flight; disaster

Flight attendants were fine, seats a bit hard but I use a cushion for extra support. The only issue was it was a bit too cool and I needed to ask for and received and extra blanket. I survived!!!

Very few things and/or people are excellent. It was very good.

Extremely uncomfortable seats. Experience was like a Frontier Airlines flight. Would not fly it again.

Very, very tight legroom. They must’ve jammed in an additional few rows of seat seating. Denver to Munich was the least legroom I’ve ever had on any flight, let alone a multi hour international journey. I will not take that flight again.

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.

Meh. Lived the seat. The entertainment unit did not work and had to be reset 3 times. Service was SLOW taking over 90 min to be served. Crew forgot about my meal. Chicken was dry and almost inedible.

Boarding process was chaotic. Confusion over Boarding gates: gate 55 or gate 56 ???. Unnecessary standing in long lines to board. Better to call out Boarding groups one at a time and everyone else to sit. Airline only has 2 Boarding groups 1-3 and 4-9. That causes over crowding and chaos

Lady next to me was coughing profusely the entire flight, other lady moved seats because of it, 8 hours of that during an overnight flight is a bit much.

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

Canceled flight late London to Florence. Help at airport very poor. Treated poorly. Had to sleep in the airport. Lost bags- still do not have them. Horrible. I should be reimbursed!

The seats are extra cramped if you are taller than 5’8! Spring for the extra legroom seats for sure if you have a long flight!

Very disappointed with British Airways. It has been over 24 hours and I still have not received my checked baggage or any proper update. Customer support has been unresponsive, making the situation even more frustrating. Poor baggage handling and lack of communication seriously impacted my travel experience.

Flight was good but temp in the cabin was cold.

I like American Airlines and their safety record. They provide quality service and a feel safe enough to prefer American Airlines over other carriers even if I have to pay a little more.

Cancelled flight and re booked seats were a downgrade. British Airways said the upgrade was t available but when I checked it was but then they wouldn’t make it right

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

Information on your arrival and departure airports