£308 Cheap Flights from Denver (DEN) to London (LHR)

View £308 flight on Wed, 25 Nov 2026Opens in a new window

Flight 1

Popular airlines from Denver International Airport (DEN) to Heathrow Airport (LHR)

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Cheap Flights from Denver (DEN) to London (LHR)

Prices were available within the past 7 days and start at £308 for one-way flights and £567 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Tue, 10 Nov - Thu, 19 Nov
DEN
Denver
LHR
London
£567 Return, found 3 days ago
£567
Return
found 3 days ago
Select Icelandair flight, departing Tue, 10 Nov from Denver to London, returning Thu, 19 Nov, priced at £567 found 3 days ago
Icelandair
Thu, 20 Aug - Wed, 26 Aug
DEN
Denver
LHR
London
£579 Return, found 1 day ago
£579
Return
found 1 day ago
Select Icelandair flight, departing Thu, 20 Aug from Denver to London, returning Wed, 26 Aug, priced at £579 found 1 day ago
Aer Lingus
Mon, 10 Aug - Wed, 26 Aug
DEN
Denver
LHR
London
£622 Return, found 6 hours ago
£622
Return
found 6 hours ago
Select Aer Lingus flight, departing Mon, 10 Aug from Denver to London, returning Wed, 26 Aug, priced at £622 found 6 hours ago
United
Sun, 2 Aug - Wed, 19 Aug
DEN
Denver
LHR
London
£630 Return, found 2 days ago
£630
Return
found 2 days ago
Select United flight, departing Sun, 2 Aug from Denver to London, returning Wed, 19 Aug, priced at £630 found 2 days ago
KLM
Tue, 4 Aug - Mon, 24 Aug
DEN
Denver
LHR
London
£636 Return, found 6 hours ago
£636
Return
found 6 hours ago
Select KLM flight, departing Tue, 4 Aug from Denver to London, returning Mon, 24 Aug, priced at £636 found 6 hours ago
Lufthansa
Mon, 4 Jan - Thu, 14 Jan
DEN
Denver
LHR
London
£636 Return, found 2 days ago
£636
Return
found 2 days ago
Select Lufthansa flight, departing Mon, 4 Jan from Denver to London, returning Thu, 14 Jan, priced at £636 found 2 days ago
Virgin Atlantic
Mon, 10 Aug - Wed, 26 Aug
DEN
Denver
LHR
London
£641 Return, found 6 hours ago
£641
Return
found 6 hours ago
Select Virgin Atlantic flight, departing Mon, 10 Aug from Denver to London, returning Wed, 26 Aug, priced at £641 found 6 hours ago
Air France
Tue, 4 Aug - Mon, 24 Aug
DEN
Denver
LHR
London
£641 Return, found 6 hours ago
£641
Return
found 6 hours ago
Select Air France flight, departing Tue, 4 Aug from Denver to London, returning Mon, 24 Aug, priced at £641 found 6 hours ago
Air Canada
Sat, 8 Aug - Tue, 18 Aug
DEN
Denver
LHR
London
£650 Return, found 4 days ago
£650
Return
found 4 days ago
Select Air Canada flight, departing Sat, 8 Aug from Denver to London, returning Tue, 18 Aug, priced at £650 found 4 days ago
British Airways
Wed, 9 Sept - Thu, 24 Sept
DEN
Denver
LHR
London
£652 Return, found 21 hours ago
£652
Return
found 21 hours ago
Select British Airways flight, departing Wed, 9 Sept from Denver to London, returning Thu, 24 Sept, priced at £652 found 21 hours ago

Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Gatwick LGW. Average driving time to city centre is 52 minutes. Flights from £1,096
LGW
Gatwick
Average driving time to city centre52 min
Flights from £1,096

Find the cheapest month to fly from Denver (DEN) to London (LHR)

August is typically the cheapest month to fly

From £441 - £871 per traveller.

Frequently asked questions

What is the cheapest month to fly from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
September is typically the cheapest month to fly from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow), with average return fares of approximately £924. This is about 16% lower than the average price throughout the year. September often sees lower prices as the peak summer travel season winds down, and before the holiday rush begins. Other cheap months to fly from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) include August and October.
Which airlines fly direct from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
Enter DEN to LHR and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
To find a cheap flight from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
The best airline to fly with from Denver, CO (DEN-Denver Intl.) (DEN) to London (LHR-Heathrow) (LHR) will differ from traveller to traveller. If you like to fly early, BA offers early morning flights. If price is the most important factor, UA typically offers the lowest fares. AA offers the most daily flights from Denver, CO (DEN-Denver Intl.) (DEN) to London (LHR-Heathrow) (LHR), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
Based on booking data from the past year, the cheapest months to fly from Denver International Airport (DEN) to London Heathrow (LHR) are typically September and August, with average return flights around £924. While these months offer good value, it's worth noting that August is a popular travel time, so you'll likely find plenty of flight options, balancing a good price with convenience.
How many flights per day from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
There are approximately 3 nonstop flights per day from Denver International Airport (DEN) to London Heathrow (LHR). For even more choice, look at flights that include layovers. You'll find around 137 connecting flights per day. Some common connection points include O'Hare International Airport (ORD), John F. Kennedy International Airport (JFK), and Logan International Airport (BOS).
What is the earliest flight from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
The earliest flight from Denver, CO (DEN-Denver Intl.) (DEN) to London (LHR-Heathrow) (LHR) typically departs at approximately 12:20 AM local time, operated by Delta. This is a seasonal service active in January and December. An early departure like this can help you maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
You'll typically find the most flights from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) on a Wednesday, with around 103 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include United Airlines, American Airlines, and Delta Air Lines. Flight schedules are consistent throughout the week.
What are the most popular departure times for flights from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
The most popular departure times for flights from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) are in the afternoon, from 3pm to 6pm. About 31% of passengers prefer this time. Many major carriers, including United Airlines and Lufthansa, offer flights during this window. This timing works well because it allows you to have a productive day before your flight and arrive in London at a reasonable hour.
How long does it take to fly from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
Direct flights from DEN to LHR usually take about 9 hours, traveling roughly 4,659 miles. If you opt for a connecting flight, expect to add around 4 hours 50 minutes to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
Select the "Business class" and "First class" filters when looking for DEN to LHR flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) flight with Expedia?
It's easy to earn miles on a Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for London from Denver Intl. (DEN)?
When traveling from Denver Intl. (DEN) to London, you can fly into London City (LCY), Heathrow (LHR), Gatwick (LGW), Stansted (STN) and London Intl. (YXU). Some flights may connect through major hubs like Minneapolis - St. Paul Intl. (MSP), O'Hare Intl. (ORD), Franz Josef Strauss Intl. (MUC) before reaching London. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) at the last minute?
Typically, booking a last minute flight from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) flight and hotel package?
Securing a Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow)?
If you booked your Denver, CO (DEN-Denver Intl.) to London (LHR-Heathrow) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Denver Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Turkish Airlines, United, Virgin Atlantic, WestJet
Return price
£567
Distance
7454 km
Average flight time
16 hours 5 mins

Book with confidence

Compare flights from Denver to London easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Denver to London. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Heathrow in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Denver Intl. to Heathrow.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Denver Intl. (DEN) to Heathrow (LHR)

The easiest way to view the best deals on flights from Denver to London today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Denver Intl. to Heathrow start at just £567 and range up to £652.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Denver and London
  • booking your flight during November, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Denver to London flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Denver Intl. to Heathrow for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Denver to London easily and book with confidence

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