LHR - DEN

$684 Find Cheap Flights from London Heathrow Airport to Denver - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to Denver departing on 8/25. 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.
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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$867
Typical prices: $645-$903
Icelandair
Thu 9/3Tue 9/22
LHR - DEN • 1 stop
Cheapest non-stop
$869
Typical prices: $649-$908
Lufthansa
Mon 9/21Tue 9/29
LHR - DEN • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
BA premium economy adds priority boarding; Iberia offers 37” pitch in Premium Economy.
Lufthansa Economy includes meals; Heathrow security queues can be long.
Expert advice
Expert advice
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Expert advice
Top airlines
Cheapest • from $867 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
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Airline reviews
+1
Nonstop flights
You can fly direct with British Airways and United Airlines. Average duration is 9h 45m
Direct flights
Direct flights
+1
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Direct flights
Direct flights
+1
Avoid delays
Most punctual • 89% on-time
Best time • Fewest delays
Insights
Insights
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Insights
Top layover airports
Cheapest • Avg $398 (round-trip)
Shortest trip • 14h 19m (one-way)
Insights
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When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 24% compared to booking last minute.
Insights
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Insights
When to travel
Cheapest • 20% price drop
Most popular
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Flight Deals

Cheap Flights from Heathrow to Denver (LHR-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Heathrow to Denver 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 round-trip flight deals from Heathrow to Denver

Thu, Sep 3 - Tue, Sep 22
Icelandair Logo
9:25 pm - 12:40 pm
LHR
-
DEN
22h 15m
1 stop
Icelandair Logo
4:40 pm - 11:55 am
DEN
-
LHR
12h 15m
1 stop
$867Icelandair
Tue, Sep 22 - Wed, Oct 7
Multiple Airlines Logo
8:30 am - 3:40 pm
LHR
-
DEN
14h 10m
1 stop
Multiple Airlines Logo
4:40 pm - 11:55 am
DEN
-
LHR
12h 15m
1 stop
$868Multiple Airlines
Mon, Sep 21 - Mon, Oct 5
United Airlines Logo
7:30 am - 1:35 pm
LHR
-
DEN
13h 05m
1 stop
United Airlines Logo
4:40 pm - 11:55 am
DEN
-
LHR
12h 15m
1 stop
$869United Airlines
Tue, Sep 22 - Thu, Oct 1
United Airlines Logo
7:30 am - 1:35 pm
LHR
-
DEN
13h 05m
1 stop
United Airlines Logo
12:30 pm - 7:15 am
DEN
-
LHR
11h 45m
1 stop
$870United Airlines
Mon, Sep 21 - Mon, Oct 5
United Airlines Logo
7:30 am - 1:35 pm
LHR
-
DEN
13h 05m
1 stop
United Airlines Logo
5:35 pm - 9:40 am
DEN
-
LHR
9h 05mnonstop
$871United Airlines
Tue, Sep 1 - Wed, Sep 23
United Airlines Logo
6:55 am - 1:45 pm
LHR
-
DEN
13h 50m
1 stop
United Airlines Logo
5:35 pm - 9:40 am
DEN
-
LHR
9h 05mnonstop
$872United Airlines
Wed, Sep 23 - Thu, Oct 8
United Airlines Logo
6:55 am - 1:45 pm
LHR
-
DEN
13h 50m
1 stop
United Airlines Logo
10:20 am - 6:55 am
DEN
-
LHR
13h 35m
1 stop
$873United Airlines
Tue, Sep 1 - Tue, Sep 15
Lufthansa Logo
2:50 pm - 5:35 pm
LHR
-
DEN
9h 45mnonstop
Lufthansa Logo
8:25 pm - 12:25 pm
DEN
-
LHR
9h 00mnonstop
$874Lufthansa
Tue, Sep 1 - Wed, Sep 23
United Airlines Logo
6:55 am - 1:45 pm
LHR
-
DEN
13h 50m
1 stop
United Airlines Logo
9:40 am - 6:30 am
DEN
-
LHR
13h 50m
1 stop
$875United Airlines
Tue, Sep 22 - Sun, Oct 4
United Airlines Logo
6:55 am - 1:45 pm
LHR
-
DEN
13h 50m
1 stop
United Airlines Logo
11:59 pm - 9:35 pm
DEN
-
LHR
14h 36m
1 stop
$876United Airlines
Booking Insights

KAYAK's insights & trends for Heathrow to Denver flights

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

How much is a round-trip flight from London Heathrow Airport to Denver?

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

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

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

For London Heathrow Airport to Denver, Wednesday is the cheapest day to fly on average and Tuesday is the most expensive. Flying from Denver back to London Heathrow Airport, the best deals are generally found on Wednesday, with Saturday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport to Denver, 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 London Heathrow Airport to Denver is September, where tickets cost $685 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is $1,101 and $1,044 respectively.

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

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $918 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to Denver, 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 London Heathrow Airport to Denver, you should book around 2 weeks before departure, which saves you about 24% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Expert advice

Expert advice for your flight from Heathrow to Denver

 
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
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, specialized in airline interiors and regulations. Ten 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 on the 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 traveled to more than 50 countries across six continents.

Duncan Madden

Duncan Madden

Expert on British Airways and LHR

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.

Harriet Baskas

Harriet Baskas

Expert on DEN

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low season

January

Cheapest flight

$684
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly and prices are also 21% lower on average.
Flight from London Heathrow Airport to Denver

When to book flights from Heathrow to Denver

Are your dates flexible? Find out the best times to travel from Heathrow to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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.

FAQs for booking London Heathrow Airport to Denver flights

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

    In the last 5 days, the lowest price for a flight from London Heathrow Airport to Denver was $684 for a one-way ticket and $867 for a round-trip.

  • Do I need a passport to fly between London Heathrow Airport and Denver?

    Yes, you’ll need a passport to travel to Denver from London Heathrow Airport.

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

    The Boeing 787-9 Dreamliner is the aircraft model that flies most regularly on the London Heathrow Airport to Denver flight route.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from London to Denver are United Airlines and American Airlines. With an average price for the route of $1,169 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $910 and an overall rating of 7.1.

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

    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 London Heathrow Airport to Denver.

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

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

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

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to London Heathrow Airport with another airline. Booking your flights between London Heathrow Airport and DEN can sometimes prove cheaper using this method.

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

    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 Denver from London Heathrow Airport 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 London Heathrow Airport to Denver

  • Looking for a cheap flight? 25% of our users found flights on this route for $712 or less one-way and $891 or less round-trip.

Prefer to fly direct from London Heathrow Airport to Denver?

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

Direct departures

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

Direct returns

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

Reviews of the top 5 airlines serving from Heathrow to Denver

 
See real verified KAYAK customer reviews for airlines flying from London to Denver. 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 Heathrow to Denver? 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 10005 reviews
8.1Crew
7.7Boarding
7.3Comfort
6.6Food
7.1Entertainment
Airline reviews

We flew business fares. Was amazing. However, the check in didn't offer business fares preboarding which is less hectic. 8/10 due to this. Staff compared to Canadian carriers go above and beyond. Would gladly fly United again.

10.0 ExcellentChris, Jul 2026
IAH - DEN
Read more United Airlines reviews

We flew business fares. Was amazing. However, the check in didn't offer business fares preboarding which is less hectic. 8/10 due to this. Staff compared to Canadian carriers go above and beyond. Would gladly fly United again.

The staff was incredible, very attentive, polite, made you feel like the center of the universe. They even all wrote me a happy birthday card. Truly just an amazing crew, cannot stress it enough.

Checking bag at terminal was horrible. No agents to check us in and only 1 kiosk working. Boarding went ok. Crew onboard was very scattered rained. Missed our row while serving and then didn’t see them hardly again.

The entertainment is a bit limited, it would be better if they added some games to play besides the movies and tv shows. But the seats are comfortable and the crew is polite

Food was great. Staff was phenomenal. Seats were a bit hard and could use a lot more entertainment options as far as movies to choose from. WiFi was good. Overall great trip.

Boarding was smooth and efficient. The only food was some pretzels, but it was a short flight. Not much to order if you were hungry.

Read the fine print. This was my flight home. I booked my flight for the quickest way home. Had a carry-on and a personal item. Same as my outbound flight. Apparently I needed to pre-pay extra for my carry-on. When I checked in, I was told that I had to check it. I said I’ll pay for it, and was told that this wasn’t an option anymore. They said I still had to pay $50 to check my carry-on. I told them I’ll pay whatever to just carry it in as intended. I was not allowed, so eventually I paid $50 to check my carry-on under a plane that was half full, with overhead compartments that were even less full. My white carry-on suitcase was practically destroyed getting from Idaho falls to Denver to Orange County. The low price air fair was a bait and switch. Got me to the gate, made me pay extra, then didn’t even allow me to pay for a carry on. Not to mention that I paid the $8 for WiFi that didn’t work. All to get my suitcase destroyed. I don’t think I’m going to even keep my Untied mileage plus membership and card. Apparently, membership does not have its privileges for this one.

I flew from Santa Fe to Denver to catch a flight to London and the transfer of my luggage on arrival at Denver to the London flight worked perfectly. The crew on the ground and on board for the London flight were so friendly and efficient.

Very friendly and helpful staff on board and United was excellent when I missed my onward flight due to the delay in London. Very well organised meant much less stress

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the room where it was being kept.

Everything was delayed and the staff sent me to the wrong gate, causing me to miss one of my flights. I arrived at my destination 6 hours later than I was supposed to.

On the return flight, arriving in Denver we sat on the tarmac in Denver for over 20 minutes.

The flight was fine. It's the satellite terminal that supports American eagle flights is what sucks. There is only one food option and everything there is way overpriced. I mean I know it's airport pricing, but it's even crazier than that. I bought a sandwich in a plastic container for $18.

Don't change gate multiple times make people run across the airport. Announce delays in a timely manner. Have maintenance crew ready. Don't delay and keep passengers on the plane for 3 hrs. on tarmac.

The flight attendant use 1.5 hours to answer my call. My dirty food tray was unattended.

Our bags took a long time to get unloaded once we landed.

Terrible. The flight was delayed two hours due to weather. Then when we got on the plane, the first pilot ended up timing out and we had to wait for a second pilot. Second pile came on board and we tax it out. Had to return back to the gate because of an unruly passenger. Then the copilot timed out. Had to wait for new copilot. Also had to wait for maintenance to check for fuel. Then found out the second pilot timed out and we had to wait for a third pilot. Was ready to go and then needed maintenance again for another issue. In the end, it was 2 o’clock in the morning when they announced that the flight couldn’t go because the third pilot and the second copilot had timed out.

One of the best flights I’ve had. So smooth.

Because I can’t stand very long in one place, I was allowed to reword.

Flight to Phoenix was delayed 1 hour and was not weather related. Flight Denver was delayed 2.5 hours and again was not weather related as the plane came from San Francisco.

The ticket was reserved in my name but not paid for by underpricer. Alaska airlines was unable to issue my ticket (could not connect the ticket with the PNR) due to an error with underpricer and I spent the better part of 2 hours at the ticket counter trying to rectify.

1. No food on a 8 hr flight is a travesty! The fare was not that low. 2. The entertainment was pretty bad and you had to buy headphones!!! 3. Only 2 toilets for the whole Economy section!!

We paid for saga class, which is the business class for international. My seat was broken and did not recline and my monitor for in-flight entertainment was broken.

Friendly flight crew. Airplane (757) configured as a domestic flight (no lie-flat seats) & no advanced meal selection.

The most uncomfortable seat i’ve ever had on a flight

If there was a disclaimer regarding food service or lack thereof, l missed it. If l had known l would have prepared better. Same with transferring at Reykjavik. No information about disembarking via stairs into rain, slush and puddles deep enough to swallow a foot. After being treated to haute cuisine restaurants and warm inviting environment during the flight, the airport is, let’s be kind, disappointing. Plane was comfortable, Airbus, staff were welcoming enough. I would likely try the route again. Maybe have a night and day in Iceland. Maybe not.

For an economy lite experience, it's by far the best I've had. New planes, clean, great destinations. Very happy to have discovered Iceland Air.

Smooth efficient airline. Think they should have their own bag drop as the queue took 30mins to bmscan and drop

did internet check in but still had to get checked in at the counter and this was not the first time. Bummer!

Paying $75 for my bag is disgusting. Got off ground late so I missed my connections. Kept us waiting for passengers in the cold. Will not use them again.

I liked the flight, the attendants, and the comfort. But the gate for boarding was poor. Even the elderly had to climb down many many steps to the bus and climb up to the plane.

Service was excellent. Flight was only about half full, which meant we had tons of room to stretch out. Boarding area was nice and well organized, flight attendants were super friendly and attentive and we loved the 3 snacks!

Lufthansa is turning into a budget airline. On transfers, the luggage never arrives if you have less than 2 hours for the transfer. This is happened to me multiple times when I end up on flights serviced by Lufthansa. The first leg of the flight was serviced by Discover Airlines. It was a 3-hour flight and they only offer a glass of water. Everything else is for purchase. I purchased my ticket as economy which should have included a bag but it ended up booking as economy light so I had to pay for a bag in each direction.

The food that was served was superb!!! Awesome snacks!!! Frequent drink service!!! To me, this was shocking. I took a British Airways flight from Denver to London for the first leg of my trip and the food was horrendous. Thank you for keeping us fed and satiated on such a long flight!!!!

It was freezing. I asked crew member for a blanket and was told it might be in front of plane but I never got one. I turned off all the vents but still froze.

My flight was delayed d the gate was never updated inside the terminal. If I hadn’t checked my email I would have missed my flight. Also, I paid a total of $5100 for my flight to be. Business or first class. My final leg of my flight from Heathrow to Frankfurt was not to standard of what I expected or experienced in the previous legs of my trip.

I think it was a United A380 plane. The trip from Munich to Denver was about 12 hours and the preferred economy seat I paid $75 for was very cramped. The crew was nice but I was so uncomfortable and getting up to walk around didn’t really help. My legs were swollen for 4 days afterward. I would think on such a long trip the seats would have more room. I would have gone 1st class but it was 3-4 times more expensive. I won’t fly anywhere far away again. My last experience with Lufthansa was great to Italy and back, but this time I could swear everything was United and not good.

Not good. They charged an additional $70 to check a bag we had already paid for on line with Lufstansa

This flight went smoothly and the economy plus free upgrade worked very well.

The hot towels before the second meal was an unexpected surprise. The crew was attentive and personable, and that’s a lot on a nine hour flight. And the hot pretzels were a kind of “auf wiedersehn “ to Germany.

Long line with check in at the DIA British Airway counter.

It was great overall. A few slight improvements could be made on the onboarding process at the Gates with announcements and clarity of communications (both at the gate and in flight). The movies in the entertainment options could be improved for bollywood, hollywood.

Everything excellent except for bag drop off. We started at the D area and that was so slow that it was eventually closed just as we were about to go to a station. We then went to F. We got one suitcase checked and then the screen showed that the station was no longer operable. There were long lines everywhere so we had to ask if we could butt in to the next station to finish. Again, this was the only incident, otherwise it was an excellent flying experience

There were no gluten-free vegan options available, so food was very limited on this flight, and some of the crew weren’t especially helpful about it. To make matters worse, a passenger was sick on board, and although the area was cleaned, the smell lingered for the rest of the journey. On top of that, we ended up circling for an extra hour, which only made the unpleasant situation drag on even longer.

We never made it onto this flight due to BA's lackluster organisation.

We arrived late to London, and consequently were 5 min. late to be allowed through security for our next flight. Even though dozens of people missed the same flight, BA did not radio ahead to hold open security for an extra 5-10 min. to allow people to get on the flight. This caused an additional 6 hour delay in London after waiting over an hour in Customer Service to get rebooked. They did not have enough staff on hand to help people in a timely manner. Not at all happy with the BA's customer care or customer service.

Boarding was fairly chaotic. One of your employees clipped my ankle as he was passing with an empty wheelchair and not only did not apologize but stated something to the effect of “oh forGod’s sake.” There was plenty of room for him to pass. otherwise, everything was excellent.

Seating is tight if you don’t upgrade. Food was decent. Boarding and unboarding was efficient. Smooth flight. Could make upgrades more affordable

The seat was very uncomfortable. It helped to use the foot rest. Could not sleep because of the seat.

The crew was so unfriendly. Our (the last) section of the plane only got drink service once during an over 9 hour flight. When it come to the main meal service we only got a vegetarian option and where told the chicken option gone. About 30 minutes later I went to the bathroom and lo and behold the whole crew were eating the chicken option.

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

Information on your arrival and departure airports