Find Cheap Flights from London Heathrow to Denver International (LHR - DEN)

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Good to Know

Low Season:
February
Best time to beat the crowds
6%
expected price decrease
High Season:
July
Most popular time to fly
28%
expected price increase
Average Price:
$1414
(avg. price over the last 2 weeks)
Good Deal:
$860
or less (round trip)

When to Book Flights from London Heathrow to Denver International

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

When looking for a cheap flight, consider that 25% of our users selected a flight on this route for $860 or less.
The cheapest flight from London Heathrow to Denver International was found 90 days before departure, on average.
Book at least 3 weeks before departure in order to get a below-average price.
High season is considered to be June, July and August. The cheapest month to fly is February.
Morning departure is around 32% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking London Heathrow to Denver International Flights

How long does a flight from London Heathrow to Denver International take?
An average nonstop flight takes 9h 50m, covering a distance of 4659 miles.
How many flights are there between London Heathrow and Denver International?
There are 36 (nonstop) flights between London Heathrow and Denver International per week, averaging 5 per day.
Which airlines provide the cheapest flights from London Heathrow to Denver International?
In the past 3 days, the cheapest round-trip tickets were found on Icelandair ($564), British Airways ($612) and Multiple Airlines ($615).
Do I need a passport to fly between London Heathrow and Denver International?
Yes.
Which airlines fly most frequently between London Heathrow and Denver International?
American Airlines (1 times daily), Aer Lingus (1 times daily), Finnair (1 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly London Heathrow to Denver International?
For London Heathrow to Denver International, Thursday is the cheapest day to fly on average and Tuesday is the most expensive. Flying from Denver International back to London Heathrow, the best deals are generally found on Sunday, with Tuesday being the most expensive.

Book cheap flights from London Heathrow to Denver International (round-trip)

Airports
Origin
London
$564
only
$564
Destination
Denver
$564
only
$564
Thu, Feb 22
LHR
DEN
12h 45m
Tue, Mar 6
DEN
LHR
12h 00m
Trip: 13 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6243 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
KEF
IAD
Mediocre 3.6

I made it home with my luggage.

Absolutely chaos boarding, seats way to close together in both width and length. They had open seats with more room, told me I couldn’t move seats but let others. Each leg of the flight the pilots landed like the plane fell out of the sky! The crew was yet again nowhere to be found during the flight. They do offer food for sale during the flight but it’s at outrageous Icelandic prices!! Never again!!!

LGW
KEF
Excellent 8.3

After a long journey overall, it was nice to have an easy plane ride to Iceland!

N/A

HEL
KEF
Excellent 10.0

Crew very nice, food delicious and nutritious

BOS
KEF
Mediocre 2.0

Tried to reschedule flight just a few days later because of a friend's wedding. It would have cost more in fees to reschedule the flight than it cost in the first place, and THEN I would have had to pay for an entirely new flight. JustFly was absolutely awful to work with and showed neither remorse nor compassion.

ORD
KEF
Good 7.0

Such a short connection time. 45 minutes does not allow for much margin of error.

Sat, Dec 9
LHR
DEN
34h 25m
Mon, Dec 11
DEN
LHR
13h 09m
Trip: 3 days
7.9GoodShow reviews
Overall 7.9 Good
Based on 130 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
DEN
Excellent 10.0

plane was not full so plenty of room to move around etc

LHR
DEN
Mediocre 3.3

very little food! chairs r too tight and tv screens r rediculously small... no usb adaptors to charge ur phone, no toilette seat covers!

LHR
DEN
Good 7.3

Meal from Lagos to London was good

I don't know why spray was used on Lagos flight to London and London flight to Denver no spray.

LHR
DEN
Good 7.6

Because we missed our connecting, British Airways did provide us with food and hotel.

We missed our connecting flight because somebody checked in and checked bag for our incoming flight, but did not get on the plane. It delayed us an hour. The problem was when we got to Heathrow 45 minutes before flight left, but they had already bumped us from the flight. We could’ve easily made the flight, but they blamed it on the computers, and we had to get on a flight the next day. I think we need to quit relying so much on computers, and use our actual brains!

LHR
DEN
Mediocre 2.0

Nothing

Nothing was impressive at all

Sat, Feb 17
LHR
DEN
13h 55m
Tue, Feb 27
DEN
LHR
13h 00m
Trip: 11 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Mar 20
LHR
DEN
18h 27m
Tue, Apr 3
DEN
LHR
14h 00m
Trip: 15 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1468 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.5
AMS
IAH
Good 7.3

Per usual, KLM can't seem to figure out the order of boarding the plane. Should be business - priority - everyone else. Instead they do priority first, and that's usually two-thirds of the passengers. Strange choice of in-flight movies; no accounting for taste, I guess.

ATL
CLE
Okay 4.0

OLD plane without comfort or entertainment

MUC
AMS
Good 7.6

Great food

Sears we're toooo small

AMS
SFO
Excellent 10.0

Loved the service...everything was excellent

The bus class seat was a bit narrow at the feet

ATL
CLE
Okay 4.6

old plane, tight and uncomfortable

Tue, May 1
LHR
DEN
18h 03m
Tue, May 15
DEN
LHR
9h 00m
Trip: 15 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 1375 reviews
Overall
7.1
Boarding
7.1
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
BRU
IAD
Excellent 10.0

Airplane was clean and service was attentive. Food was good and served hot.

JFK
BRU
Excellent 10.0

They gave us a pillow and blanket so we could sleep. They offered a good selection of movies and other entertainment. The airline staff was friendly and helpful.

Seating was cramped but all airlines treat their three class clients like cattle.

LYS
BRU
Excellent 9.0

I travel often with Brussels Airlines and often run out of movies I want to watch during my trips. Air France has a selection of movies that is 2-3 times the number of movies offered by Brussels.

TLV
BRU
Okay 5.6

The crew were very nice.

It was a small plane with only 1 bathroom which was not available for the flight due to long lines. There was no food or even a drink of water without payment. there was no in flight entertainment.

JFK
BRU
Okay 4.0

Paid extra to secure aisle seat booking, reconfirmed byne two days before flight, at check-in was reassigned to a middle seat, without explanatiob or apology. Had to be uncomfortably adamant about paid aisle seat reservation for them to put me in one of the several still available.

Tue, Mar 20
LHR
DEN
15h 10m
Sat, Apr 14
DEN
LHR
20h 15m
Trip: 26 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 16763 reviews
Overall
8.2
Boarding
8.2
Comfort
7.9
Crew
8.5
Entertainment
7.8
Food
7.7
IST
FRA
Excellent 9.6

The food and service was superb.

BUD
MUC
Excellent 10.0

My flight from Budapest took off hour later then scheduled. We landed in Munich only ten minutes before the international flight's take off to San Francisco. Upon the Munich landing, eight of us were escorted on a special bus, with a special pass controll and on special routs to make sure we get on the plane on time. Our laggage managed to get on the same plane as well. Thank you Lufthansa!

MCO
FRA
Excellent 8.0

No language options on tv besides english.

FRA
JFK
Excellent 9.0

Lufthansa pilots are some of the best in the industry and the flight was extremely smooth from take off to landing. There were bouts of turbulence but the pilot immediately changed altitudes to steer away from it. Flying on the 748 is a pleasure and it's a shame these great planes will eventually all be phased out in favor of more fuel efficient 787s and their Airbus counterparts.

Having to pay 86€ for a second suitcase that weighed just 15kg. In JFK they didn't charge me but Germans always go by the book. I think for the price of the ticket and lower gasoline costs compared to the height of the recession this is simply outrageous. Next time I'll pay for economy plus. You get a seat that is wider than economy but a little bit less legroom than a business one and the second baggage is included. The meal was nothing special but the friendliness of the flight attendants made up for it.

FCO
FRA
Excellent 10.0

Ease and concenience

Tue, Mar 20
LHR
DEN
18h 22m
Wed, Apr 4
DEN
LHR
25h 10m
Trip: 16 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13528 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
DTW
EWR
Excellent 8.0

Boarding was quick. Staff and crew were friendly. Everything went well despite the 30 min delay we had on the runway. They gave us snacks and we ended up still arriving on time.

LAX
GUA
Mediocre 2.0

Nothing worst flight I've ever had.

Everything Delta was so poor quality!!! The flight attendants were not helpful.

JFK
LAX
Excellent 9.3

Check in was easy through their app. Also very quick lines to drop off bags. Crew was very nice and respectful

Seat are a little bit too close together. But overall very comfortable

ATL
SNA
Excellent 8.0

4 hour flight. Non-eventful except slight turbulence. Good to be home! Thank you!

NA

LGA
CVG
Excellent 8.3

Plane was far too tight. Very uncomfortable for taller individuals.

Tue, Feb 20
LHR
DEN
14h 55m
Fri, Mar 9
DEN
LHR
26h 06m
Trip: 18 days
8.1ExcellentShow reviews
Overall 8.1 Excellent
Based on 920 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
LHR
SFO
Good 6.0

Service is super fast

LAX
LHR
Mediocre 2.0

No one would update that the flight was delayed. They would not even communicate as to why delayed and would not put us in a different flight. Absolutely no customer service. Disappointed and would not fly jet airways again . I missed my conference lecture today as I was late.

No communication, nor will they tell you why it's late . Nor will they move you to another flight even wen requested

SYD
LAX
Excellent 9.0

After 14 hours the seats were like sitting on spikes

JFK
LHR
Good 6.3

Crew was professional.

Couldn't stretch my right (window side) leg. Display quality was poor.

LHR
LAX
Excellent 9.6

The crew was friendly and professional, the food was good and offered frequently due to the long flight time (10.5 hours). The plane was comfortable even though nearly full. Overall, it was a good experience and I would definitely fly with Virgin Atlantic again.

Thu, May 17
LHR
DEN
9h 50m
Thu, May 24
DEN
LHR
9h 00m
Trip: 8 days
8.1ExcellentShow reviews
Overall 8.1 Excellent
Based on 14 reviews
Overall
7.9
Boarding
8.0
Comfort
7.5
Crew
8.3
Entertainment
7.3
Food
7.2
LHR
DEN
Good 7.3

crew, food

Sat in row 53 of 55 rows, should have boarded in sections instead of everyone all at once. Could not sleep due to passenger behind kept jostling my backrest.

LHR
DEN
Good 7.0

I am 6'1" tall. Seats were designed for 5'1" persons.

LHR
DEN
Excellent 8.3

Crew was (as usual on BA flights) friendly, attentive, and personable.

Boarding was a bit chaotic. Everyone was all bunched up and you could not get through when your rows were called. Also, when they "boarded by rows" the called rows 23-50+ all at once so that people were all bunched up in the isles of the plane. It really did not help

JFK
HEL
Good 6.3

Food was all right because the flight didn't depart from Finland and catering was from a non-Finnish supplier. Hurrah!

Stewardesses announced that only chicken is available, regardless of any special meal requests (vegetarian etc..). Eventually special meals were located, but not before passengers specifically demanding for them. WTF. Finnair generously pours you a half an glass of wine with meal, for anything more you have to pay for. Supposedly you can buy snacks with money, but there were no menus or pricelists to be found in the seat pockets. Touchscreen functions were barely working on my entertainment screen, the remote control didn't work altogether. WIFI didn't work at all.

LHR
DEN
Excellent 9.3

Video system needed to be reset often for entire plane.

Sat, Jan 20
LHR
DEN
12h 45m
Sat, Jan 27
DEN
LHR
12h 00m
Trip: 8 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6243 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
LGW
KEF
Good 6.0

The lights in the cabin were great set up to look like the Aurora

Offered 1 drink and no snack. Rarely do you see the crew on their flights

KEF
CPH
Mediocre 2.0

Flight was canceled and I had to find out through twitter, they never called me about it until two hours before my new flight that they had put me on. Couldn't even reach them by phone. The calls would drop each time.

HEL
KEF
Excellent 10.0

Crew very nice, food delicious and nutritious

KEF
MUC
Good 7.0

Really? Not even a snack on a 6 hour flight?

KEF
EWR
Good 7.3

It was a smooth flight and the crew were quite attentive.

I didn't like the confusion of boarding. We stood in a long line for quite a while before boarding began. There were three other lines going to other destinations, which made it confusing and packed with people. Check in was a little stressful as well. Due to a belt malfunction, we had to wait in line for a long time without any information. Once we were able to check our bags, my husband's bag was declined. We had to wait in another line before finally getting the go ahead to go to customs. For the amount of money I paid, I thought a snack would have been provided.

Tue, Dec 5
LHR
DEN
18h 32m
Tue, Dec 12
DEN
LHR
13h 52m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Feb 23
LHR
DEN
12h 45m
Sun, Mar 4
DEN
LHR
12h 00m
Trip: 10 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6243 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
BOS
KEF
Good 6.6

Service of staff was sub par compared to other airlines serving Germany

KEF
CPH
Mediocre 2.0

Flight was canceled and I had to find out through twitter, they never called me about it until two hours before my new flight that they had put me on. Couldn't even reach them by phone. The calls would drop each time.

ORD
KEF
Good 7.0

Such a short connection time. 45 minutes does not allow for much margin of error.

KEF
MUC
Good 7.0

Really? Not even a snack on a 6 hour flight?

BRU
KEF
Good 6.0

Second time I have flown to Brussels with Iceland Air. I love their customer service and especially the flight route. My flight going over was cancelled due to weather. I called their reservation office , had to wait on hold for 1 hour and 15 minutes , but it was worth it. The reservation agent found me a new flight on LH, she explained I would get a conformation about 3 hours after our conversation with the flight information and new txt information. I was able to check in with LH on line that evening. Iceland Air had every pre assigned seats for me.

The boarding process in Kevlavik is pretty awful. No seating around gate areas. You have to stand in line for about 30 minutes to then have to get on shuttle to be driven to plane where you have to walk on stairs to get to plane, or in some cases you actually get to board from the terminal, which happened yesterday. I have MS,and sometimes standing for long periods of time and then having to climb up stairs is difficult for me. I also see a lot of elderly people and parents with babies having difficulty with this boarding process. Their airport really needs major expansion for the amount of people that travel thru their. Seating araes around their gates should be a priority.

Tue, Mar 27
LHR
DEN
18h 33m
Tue, Apr 10
DEN
LHR
13h 25m
Trip: 15 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1468 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.5
ATL
CLE
Okay 4.0

OLD plane without comfort or entertainment

DMM
AMS
Okay 4.0

OLD OLD plane with hard seats and tiny screens

JNB
AMS
Excellent 9.6

Comfort economy well worth the extra.

AMS
SFO
Excellent 10.0

Loved the service...everything was excellent

The bus class seat was a bit narrow at the feet

LHR
AMS
Good 7.6

I was pleasantly surprised they had a snack service on such a short flight. The flight attendants were very friendly

Amsterdam customs is the most disorganized I have ever seen. With the number of tourists entering the country you would think they would have done something about it. There were only 2 customs agents!! One for all passports and 1 for all passports. We were in the customs hall longer than we were in flight!

Mon, Feb 19
LHR
DEN
39h 43m
Tue, Mar 6
DEN
LHR
16h 50m
Trip: 16 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 1375 reviews
Overall
7.1
Boarding
7.1
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
FCO
BRU
Excellent 10.0

Everything was perfect, highly recommended

JFK
BRU
Okay 4.0

Paid extra to secure aisle seat booking, reconfirmed byne two days before flight, at check-in was reassigned to a middle seat, without explanatiob or apology. Had to be uncomfortably adamant about paid aisle seat reservation for them to put me in one of the several still available.

BRU
IAD
Excellent 10.0

Airplane was clean and service was attentive. Food was good and served hot.

TLV
BRU
Okay 5.6

The crew were very nice.

It was a small plane with only 1 bathroom which was not available for the flight due to long lines. There was no food or even a drink of water without payment. there was no in flight entertainment.

LYS
BRU
Excellent 9.0

I travel often with Brussels Airlines and often run out of movies I want to watch during my trips. Air France has a selection of movies that is 2-3 times the number of movies offered by Brussels.

Tue, May 22
LHR
DEN
14h 05m
Tue, Jun 12
DEN
LHR
23h 25m
Trip: 22 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Mar 1
LHR
DEN
12h 45m
Sun, Mar 11
DEN
LHR
12h 00m
Trip: 11 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 6243 reviews
Overall
7.6
Boarding
7.3
Comfort
7.5
Crew
8.2
Entertainment
7.8
Food
6.3
BOS
KEF
Mediocre 2.0

Tried to reschedule flight just a few days later because of a friend's wedding. It would have cost more in fees to reschedule the flight than it cost in the first place, and THEN I would have had to pay for an entirely new flight. JustFly was absolutely awful to work with and showed neither remorse nor compassion.

BRU
KEF
Good 6.0

Second time I have flown to Brussels with Iceland Air. I love their customer service and especially the flight route. My flight going over was cancelled due to weather. I called their reservation office , had to wait on hold for 1 hour and 15 minutes , but it was worth it. The reservation agent found me a new flight on LH, she explained I would get a conformation about 3 hours after our conversation with the flight information and new txt information. I was able to check in with LH on line that evening. Iceland Air had every pre assigned seats for me.

The boarding process in Kevlavik is pretty awful. No seating around gate areas. You have to stand in line for about 30 minutes to then have to get on shuttle to be driven to plane where you have to walk on stairs to get to plane, or in some cases you actually get to board from the terminal, which happened yesterday. I have MS,and sometimes standing for long periods of time and then having to climb up stairs is difficult for me. I also see a lot of elderly people and parents with babies having difficulty with this boarding process. Their airport really needs major expansion for the amount of people that travel thru their. Seating araes around their gates should be a priority.

KEF
CPH
Mediocre 2.0

Flight was canceled and I had to find out through twitter, they never called me about it until two hours before my new flight that they had put me on. Couldn't even reach them by phone. The calls would drop each time.

LGW
KEF
Good 6.0

The lights in the cabin were great set up to look like the Aurora

Offered 1 drink and no snack. Rarely do you see the crew on their flights

LGW
KEF
Excellent 8.3

After a long journey overall, it was nice to have an easy plane ride to Iceland!

N/A

Sat, Feb 24
LHR
DEN
26h 17m
Mon, Mar 12
DEN
LHR
30h 50m
Trip: 16 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 13528 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
LGA
CVG
Excellent 8.3

Plane was far too tight. Very uncomfortable for taller individuals.

ATL
MCO
Excellent 10.0

Amazing experience thank you Delta

BUF
ATL
Excellent 10.0

I asked for a change of seat at the gate and was given it. It really made a difference to be at the window.

YUL
ATL
Good 6.0

Fligth were on time

My flight from Montreal to Atlanta was 2:30 min Left at 6:10 arrive at 8:30 roughly Tried twice to get to my connection earlier and get 9:30 instead of 12:09 fligth to Daytona Delta was not flexible to allow me to book saying i did not have 55 min in between fligth which i had than lear n it will cost $75.00 to change the fligth - What? Very disappointed of Delta - lost 3 hrs at the airport today

MOB
ATL
Good 6.0

Felt like I was sitting in my neighbors lap!

Tue, May 1
LHR
DEN
20h 32m
Mon, Jun 4
DEN
LHR
24h 41m
Trip: 35 days
7.9GoodShow reviews
Overall 7.9 Good
Based on 130 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
DEN
Okay 4.0

old plane. Bad food. Old entertainment system and poor selection

LHR
DEN
Excellent 10.0

Everything

LHR
DEN
Mediocre 3.3

very little food! chairs r too tight and tv screens r rediculously small... no usb adaptors to charge ur phone, no toilette seat covers!

LHR
DEN
Good 6.6

Competent crew. Arrived early.

The plane was so old it had signs that read, no smoking in the lavatories. The entertainment screen was small and slow to respond. Should be in a museum.

LHR
DEN
Good 7.0

transfer from terminal 5 to terminal 3 - process was unclear

Tue, Mar 13
LHR
DEN
16h 25m
Tue, Mar 27
DEN
LHR
19h 05m
Trip: 15 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1468 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.5
ATL
CLE
Okay 4.6

old plane, tight and uncomfortable

JNB
AMS
Excellent 9.6

Comfort economy well worth the extra.

LHR
AMS
Good 7.6

I was pleasantly surprised they had a snack service on such a short flight. The flight attendants were very friendly

Amsterdam customs is the most disorganized I have ever seen. With the number of tourists entering the country you would think they would have done something about it. There were only 2 customs agents!! One for all passports and 1 for all passports. We were in the customs hall longer than we were in flight!

AMS
SFO
Excellent 10.0

Loved the service...everything was excellent

The bus class seat was a bit narrow at the feet

AMS
IAH
Good 7.3

Per usual, KLM can't seem to figure out the order of boarding the plane. Should be business - priority - everyone else. Instead they do priority first, and that's usually two-thirds of the passengers. Strange choice of in-flight movies; no accounting for taste, I guess.

Tue, May 8
LHR
DEN
13h 05m
Tue, May 22
DEN
LHR
13h 05m
Trip: 15 days
Overall 0.0 Poor
Based on 0 reviews
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