$181 Cheap Flights from Denver (DEN) to London (LHR)

View $181 flight on Sat, Oct 18, 2025Opens in a new window

Popular airlines from Denver Intl. Airport (DEN) to Heathrow Airport (LHR)

Cheap Flights from Denver to London (DEN-LHR)

Prices were available within the past 7 days and start at $181 for one-way flights and $396 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Oct 14 - Tue, Oct 21
DEN
Denver
LHR
London
$396 Roundtrip, found 2 hours ago
$396
Roundtrip
found 2 hours ago
Select Air Canada flight, departing Tue, Oct 14 from Denver to London, returning Tue, Oct 21, priced at $396 found 2 hours ago
British Airways
Tue, Oct 14 - Tue, Oct 21
DEN
Denver
LHR
London
$396 Roundtrip, found 2 hours ago
$396
Roundtrip
found 2 hours ago
Select British Airways flight, departing Tue, Oct 14 from Denver to London, returning Tue, Oct 21, priced at $396 found 2 hours ago
United
Tue, Oct 14 - Tue, Oct 21
DEN
Denver
LHR
London
$396 Roundtrip, found 2 hours ago
$396
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Oct 14 from Denver to London, returning Tue, Oct 21, priced at $396 found 2 hours ago
American Airlines
Tue, Oct 14 - Tue, Oct 21
DEN
Denver
LHR
London
$396 Roundtrip, found 2 hours ago
$396
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Tue, Oct 14 from Denver to London, returning Tue, Oct 21, priced at $396 found 2 hours ago
Icelandair
Wed, Nov 5 - Fri, Nov 14
DEN
Denver
LHR
London
$401 Roundtrip, found 1 day ago
$401
Roundtrip
found 1 day ago
Select Icelandair flight, departing Wed, Nov 5 from Denver to London, returning Fri, Nov 14, priced at $401 found 1 day ago
Virgin Atlantic
Tue, Oct 14 - Tue, Oct 21
DEN
Denver
LHR
London
$411 Roundtrip, found 2 hours ago
$411
Roundtrip
found 2 hours ago
Select Virgin Atlantic flight, departing Tue, Oct 14 from Denver to London, returning Tue, Oct 21, priced at $411 found 2 hours ago
Iberia
Tue, Oct 14 - Tue, Oct 21
DEN
Denver
LHR
London
$411 Roundtrip, found 2 hours ago
$411
Roundtrip
found 2 hours ago
Select Iberia flight, departing Tue, Oct 14 from Denver to London, returning Tue, Oct 21, priced at $411 found 2 hours ago
Delta
Tue, Oct 14 - Tue, Oct 21
DEN
Denver
LHR
London
$411 Roundtrip, found 2 hours ago
$411
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, Oct 14 from Denver to London, returning Tue, Oct 21, priced at $411 found 2 hours ago
Lufthansa
Tue, Oct 14 - Tue, Oct 21
DEN
Denver
LHR
London
$459 Roundtrip, found 2 hours ago
$459
Roundtrip
found 2 hours ago
Select Lufthansa flight, departing Tue, Oct 14 from Denver to London, returning Tue, Oct 21, priced at $459 found 2 hours ago
KLM
Tue, Oct 14 - Tue, Oct 21
DEN
Denver
LHR
London
$463 Roundtrip, found 2 hours ago
$463
Roundtrip
found 2 hours ago
Select KLM flight, departing Tue, Oct 14 from Denver to London, returning Tue, Oct 21, priced at $463 found 2 hours ago

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

August is typically the cheapest month to fly

From $502 - $1,141 per traveler.

Graph displaying average flight prices per month

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 center is 52 minutes. Flights from $955
LGW
Gatwick
Average driving time to city center52 min
Flights from $955
Select flight to London City LCY. Closest option available. Average driving time to city center is 21 minutes. Flights from $1,249
LCY
London City
Closest
Average driving time to city center21 min
Flights from $1,249
0
Flights from Denver (DEN) to London (LHR)
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, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic, WestJet
Roundtrip price
$395
Distance
4658 mi

Denver to London Flights

The cheapest times to fly from Denver to London

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Denver to London are during the month of October. You can find some of the cheapest flights from Denver to London with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Denver to London

Sunday is one of the best days to book for cheap flights from Denver to London: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Denver to London

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Denver to London in 2025. You can also book with separate airlines for your outbound and return journeys, from $181 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Denver to London flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Denver to London airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Denver Intl. Airport (DEN) to Heathrow Airport (LHR) cost?
You can score cheap return fares from Denver Intl. Airport (DEN) to Heathrow Airport (LHR) starting at $520. Grab a seat and take off on your trip. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a American Airlines flight leaving DEN on July 30 2025 and touching down at LHR. The price was last updated on July 4 2025 and has not changed since.
What is the cheapest month to fly from DEN to LHR?
Secure a cheap ticket by booking your nonstop flight from DEN to LHR in May. You can find a one-way American Airlines flight for $384 leaving on May 11 2026. This price is based on the cheapest direct flight found on Expedia for this route in the next 330 days. The price was last updated on July 4 2025 and remains unchanged.
Which airlines fly direct from Denver Intl. Airport (DEN) to Heathrow Airport (LHR)?
If you're departing from Denver Intl. Airport (DEN), you can take a nonstop flight to Heathrow Airport (LHR) with British Airways.
What is the cheapest airline that flies from DEN to LHR?
Right now, the cheapest airline operating one-way flights from DEN to LHR is American Airlines. You can take off on this route from $384. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from DEN on September 24 2025. Prices were last updated on July 4 2025 and have not changed since.
How many flights per day from Denver Intl. Airport (DEN) to Heathrow Airport (LHR)?
Each day, an average of 2 direct flights take off from Denver Intl. Airport (DEN) to Heathrow Airport (LHR). Select the departure date that fits your schedule best.
What are the most popular departure times for flights from Denver Intl. Airport (DEN) to Heathrow Airport (LHR)?
Flights between DEN and LHR are their busiest at 5 PM. If you'd like a quieter experience and possibly cheaper fares, choose a departure outside the usual busy windows.
What day of the week has the most flights from DEN to LHR?
If you travel on a Sunday, you'll get the largest range of options for flights from Denver Intl. Airport (DEN) to Heathrow Airport (LHR).
What is the earliest flight from Denver Intl. Airport (DEN) to Heathrow Airport (LHR)?
The first flight of the day leaving Denver Intl. Airport (DEN) is at around 5:30PM UTC-7. Catch this flight and you'll reach Heathrow Airport (LHR) at approximately 9:35AM UTC+0. The total time in the air is 9h 5m.
How long does it take to fly from Denver Intl. Airport (DEN) to Heathrow Airport (LHR)?
The average flight time from DEN to LHR is 9 hours and 5 minutes, covering a distance of 4,700 mi.
What airline has the least delays from DEN to LHR?
Consider traveling with United Airlines if you'd like to go straight from Denver Intl. Airport (DEN) to Heathrow Airport (LHR) without any interruptions. This carrier has the strongest track record for punctuality, with an on-time performance of 83%. Want real-time updates? You can check your flight status using the Expedia App.
What is the best time to fly from Denver Intl. Airport (DEN) to Heathrow Airport (LHR)?
To avoid possible delays on the Denver Intl. Airport (DEN) to Heathrow Airport (LHR) route, fly before 3 PM. Later flights are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for London from Denver Intl. Airport (DEN)?
If you're flying on a direct flight from Denver Intl. Airport (DEN) to London, Heathrow Airport (LHR) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Denver Intl. Airport (DEN) to Heathrow Airport (LHR) last-minute?
Booking your flight from DEN to LHR shortly before your trip is typically more expensive. However, if you're flexible with your itinerary, you could snag a cheap last-minute fare.
Is it cheaper to book a DEN to LHR flight and hotel package?
Booking a DEN to LHR flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Select from our extensive range of accommodations and then add flights, car rentals and activities 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 Intl. Airport (DEN) to Heathrow Airport (LHR)?
Typically, you can cancel or modify your DEN to LHR flight. However, additional charges may apply, especially if you made your booking over 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you need more details, go to our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.