Cheap flights from Denver to London Heathrow Airport from £269

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/2. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — LHR
3 Feb — 10 Feb1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Denver Intl to London Heathrow are usually found in February or September, booked 22 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Denver to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Denver to Heathrow
Explore the most affordable flight options available from Denver to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 January 2026.

Tue 11/809:40DEN - LHR
1 stop17h 20mMultiple Airlines
Tue 25/806:55LHR - DEN
1 stop13h 50mMultiple Airlines
Deal found 2/1£472
Tue 20/111:20DEN - LHR
1 stop13h 35mLufthansa
Tue 3/207:40LHR - DEN
1 stop13h 55mLufthansa
Deal found 2/1£472
Mon 17/815:40DEN - LHR
1 stop12h 55mUnited Airlines
Fri 28/806:55LHR - DEN
1 stop13h 50mUnited Airlines
Deal found 3/1£473
Fri 24/420:25DEN - LHR
1 stop13h 40mMultiple Airlines
Fri 8/506:00LHR - DEN
2 stops16h 52mMultiple Airlines
Deal found 1/1£474
Wed 8/408:45DEN - LHR
2 stops18h 15mAir Canada
Tue 21/408:45LHR - DEN
2 stops18h 10mAir Canada
Deal found 3/1£475
Sun 15/211:15DEN - LHR
2 stops37h 50mSWISS
Mon 23/217:10LHR - DEN
2 stops36h 56mSWISS
Deal found 4/1£475
Tue 20/111:20DEN - LHR
1 stop11h 35mMultiple Airlines
Tue 3/209:00LHR - DEN
2 stops18h 13mMultiple Airlines
Deal found 4/1£476
Fri 30/111:15DEN - LHR
2 stops15h 30mLufthansa
Tue 3/207:40LHR - DEN
2 stops18h 46mLufthansa
Deal found 1/1£477
Thu 12/211:15DEN - LHR
2 stops15h 50mMultiple Airlines
Tue 24/207:40LHR - DEN
2 stops18h 51mMultiple Airlines
Deal found 4/1£478
Thu 12/311:15DEN - LHR
1 stop13h 55mUnited Airlines
Wed 18/306:35LHR - DEN
1 stop15h 00mUnited Airlines
Deal found 4/1£478
Tue 10/318:25DEN - LHR
Nonstop9h 10mBritish Airways
Thu 19/312:25LHR - DEN
Nonstop10h 05mBritish Airways
Deal found 1/1£479
Mon 16/311:15DEN - LHR
1 stop13h 55mUnited Airlines
Mon 13/413:40LHR - DEN
1 stop36h 10mUnited Airlines
Deal found 4/1£480

Find flight deals from Denver to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 4 January 2026.

Round-trip from

£472

One-way from

£269

Popular in

June

Cheapest in

February

Average price

£508

Good round-trip deal

£654 or less

Good one-way deal

£342 or less
Lufthansa
  • Lufthansa
  • 20/1-3/2
  • 2 total stops
  • 27h 30m total
  • Denver to London
JetBlue
  • JetBlue
  • 17/2
  • 1 total stop
  • 26h 31m total
  • Denver to London
Highest demand for flights based on searches. 23% potential increase in price (£135 potential increase over avg. return price).
Cheapest flight prices on average. 4% potential price decrease (£19 potential savings vs. average return price).
Average for round-trip flights in January 2026
Price to beat on a round-trip flight from Denver Intl to London Heathrow.
Price to beat on a one-way flight from Denver Intl to London Heathrow.

Cheapflights Fare Finder

 
Customise your flight search to find flights from Denver to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 4 January 2026.
Use the filters below to find and compare flights from Denver to London Heathrow Airport that are best for you.

Fly from

Denver

Fly to

Heathrow

Route

Depart

Return

Price

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Sat 18/4

23:59-21:35

1 stop14h 36m

London Heathrow

Wed 29/4

06:55-14:20

1 stop14h 25m

£472

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Thu 12/3

11:15-07:10

1 stop13h 55m

London Heathrow

Wed 25/3

06:35-15:35

1 stop15h 00m

£478

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Wed 4/3

17:35-09:40

Nonstop9h 05m

London Heathrow

Fri 13/3

11:35-15:30

Nonstop9h 55m

£478

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Thu 12/3

18:10-16:50

1 stop16h 40m

London Heathrow

Thu 19/3

06:30-17:17

2 stops16h 47m

£488

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Tue 21/4

17:35-09:40

Nonstop9h 05m

London Heathrow

Sun 26/4

07:25-14:20

1 stop13h 55m

£488

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Tue 21/4

18:40-10:35

Nonstop8h 55m

London Heathrow

Wed 29/4

13:35-16:30

Nonstop9h 55m

£490

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Mon 13/4

20:20-12:20

Nonstop9h 00m

London Heathrow

Wed 22/4

11:25-14:15

Nonstop9h 50m

£490

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Thu 26/3

18:25-09:35

Nonstop9h 10m

London Heathrow

Tue 31/3

13:35-16:30

Nonstop9h 55m

£497

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Tue 10/3

18:25-09:35

Nonstop9h 10m

London Heathrow

Mon 16/3

12:25-16:30

Nonstop10h 05m

£497

DenverLondon

DEN - LHR

DENLHR

Denver Intl

Tue 10/3

18:35-09:40

Nonstop9h 05m

London Heathrow

Sun 15/3

14:30-12:37

1 stop28h 07m

£497

Flights are sorted by cheapest return flights first.

Deals found on 3/1

Showing 1-10 of 23 results
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Best time to book a flight from Denver to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Denver with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Denver to London Heathrow Airport

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

Use this chart to determine the optimal time to book a return flight from Denver to Heathrow. Price data was last updated on 2 January 2026.

The price you pay for your flight from Denver to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 22 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Denver to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from Denver to London Heathrow Airport (average of £352). Flying from Denver to London Heathrow Airport in June is currently the most expensive (average of £605). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DEN to LHR?

Find hourly flight availability from Denver to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 January 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Denver to London Heathrow Airport as you normally would.

How much does it cost for a return flight from Denver to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 4 January 2026.
Check out reviews from past customers who have flown with United Airlines, Iberia, andLufthansa from Denver to London Heathrow Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Overall

7.4

Boarding

7.7

Food

6.6

Entertainment

7.1

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Overall

7.4

Boarding

7.7

Food

6.6

Entertainment

7.1

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Overall

7.4

Boarding

7.7

Food

6.6

Entertainment

7.1

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Overall

7.4

Boarding

7.7

Food

6.6

Entertainment

7.1

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Overall

7.4

Boarding

7.7

Food

6.6

Entertainment

7.1

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Related info for your journey

Find useful and relevant information for your journey from Denver to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly from for flights from Denver to London Heathrow?

    If you book a flight to London Heathrow from Denver, you will be flying from Denver Intl, which is the city’s only airport. Denver Intl (DEN) is located 18.5 mi from the center of Denver. There are 11 flights from Denver Intl to London Heathrow per day from 4 different airlines.

  • How long is the flight from Denver to London Heathrow Airport?

    United Airlines and Delta can get you from Denver to London Heathrow Airport in just under 14h 36m. Your travel time can differ by up to 2h 04m. The distance from Denver to London Heathrow Airport is about 4655 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Denver to London Heathrow Airport round-trip?

    Currently priced at £425, Lufthansa will fly you from Denver to London Heathrow Airport and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Iberia and British Airways - these airlines can fly you to your destination from £453 and £474, respectively. Lufthansa is 26% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the most reliable airlines from Denver to London Heathrow Airport?

    Consider Air Canada (80%), Austrian Airlines (80%) or Brussels Airlines (80%) when booking your flight. These represent the most reliable airlines when flying from Denver to London Heathrow Airport.

  • What are the cheapest flights from Denver to London Heathrow Airport?

    On average you can expect to pay £651 for a flight from Denver to London Heathrow Airport. The cheapest flight overall is £183 while the most popular route, (Denver Intl - London Heathrow) is currently priced at £360.

  • Can I find deals for flights from Denver to Heathrow that include hotel bookings?

    Yes. In addition to deals on Denver to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Denver to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to Heathrow.

  • Can I find deals for business class flights from Denver to Heathrow?

    Yes. Cheapflights offers flight deals from Denver to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, January is the cheapest month in which you can book a flight from Denver to London Heathrow Airport (average of £352). Flying from Denver to London Heathrow Airport in June is currently the most expensive (average of £605). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Luton
Croydon
Northampton
Slough
Hounslow
Gatwick
Ilford
Wembley
Brentford
Hayes
Colchester
Watford
Crawley
Swindon
Kingston upon Thames
Bedford
Chelmsford
Eastbourne
Romford

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Denver to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from Denver to Heathrow

Discover the top 4 airlines that operate flights from Denver to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 4 January 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£425Average£660FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IberiaCheapest£453Average£507FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£474Average£594FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£477Average£568FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Denver to Heathrow?

Cheapflights makes it easy to find Denver to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Denver to Heathrow?

Millions of users choose and trust Cheapflights to book the best flight deals from Denver to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Denver to Heathrow with no change fees?

Yes! Cheapflights helps users easily find flights from Denver to Heathrow with no change fees.

Can Cheapflights notify me if prices for flights from Denver to Heathrow become cheaper?

Yes, Cheapflights offers price alerts on Denver to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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