Flights from Denver to London available from USD 518*

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Our best rates from Denver to London

Fly in the next three months: flights from Denver to London

USD

Denver (DEN)to

London (LHR)
Sep 09 2025 - Sep 21 2025
From
USD 1,161
Round trip
Economy

Denver (DEN)to

London (LON)
Sep 30 2025 - Oct 30 2025
From
USD 519
Round trip
Economy

Denver (DEN)to

London (LON)
Sep 30 2025 - Oct 31 2025
From
USD 519
Round trip
Economy

Denver (DEN)to

London (LON)
Oct 03 2025 - Oct 31 2025
From
USD 519
Round trip
Economy

Denver (DEN)to

London (LON)
Oct 04 2025 - Nov 01 2025
From
USD 519
Round trip
Economy

Denver (DEN)to

London (LON)
Oct 04 2025 - Nov 02 2025
From
USD 519
Round trip
Economy

Denver (DEN)to

London (LON)
Oct 07 2025 - Oct 30 2025
From
USD 519
Round trip
Economy

Denver (DEN)to

London (LON)
Oct 07 2025 - Nov 03 2025
From
USD 519
Round trip
Economy

Denver (DEN)to

London (LON)
Oct 07 2025 - Nov 04 2025
From
USD 519
Round trip
Economy

Denver (DEN)to

London (LGW)
Aug 29 2025 - Sep 07 2025
From
USD 1,484
Round trip
Economy

Denver (DEN)to

London (LGW)
Aug 29 2025 - Sep 06 2025
From
USD 2,414
Round trip
Economy

Denver (DEN)to

London (LGW)
Aug 03 2025 - Aug 10 2025
From
USD 2,786
Round trip
Economy

*Fares displayed have been collected within the last 72hrs and may no longer be available at the time of booking. We display fares for Economy Light as standard but it is possible to change your class of service during the booking process. You can also add baggage, meals and extra legroom to your trip during booking.

 

Blue image with a map of Iceland and text that reads: Include a little more of Iceland in your journey. Add a Stopover

Plan ahead for your trip from Denver to London with Icelandair

USD
Plan ahead for your trip from Denver to London with Icelandair
From
To
Fare type
Dates
Price
Denver (DEN)London (LON)Round trip
/
Economy
Mar 05 2026 - Mar 09 2026

From

USD 592

Viewed 12 hrs ago

Denver (DEN)London (LON)Round trip
/
Economy
Mar 05 2026 - Mar 12 2026

From

USD 592

Viewed 12 hrs ago

Denver (DEN)London (LON)Round trip
/
Economy
Mar 05 2026 - Mar 20 2026

From

USD 592

Viewed 12 hrs ago

Denver (DEN)London (LON)Round trip
/
Economy
Mar 06 2026 - Mar 09 2026

From

USD 592

Viewed 12 hrs ago

Denver (DEN)London (LON)Round trip
/
Economy
Mar 07 2026 - Mar 09 2026

From

USD 592

Viewed 12 hrs ago

Denver (DEN)London (LON)Round trip
/
Economy
Mar 09 2026 - Mar 11 2026

From

USD 592

Viewed 12 hrs ago

Denver (DEN)London (LON)Round trip
/
Economy
Mar 09 2026 - Mar 16 2026

From

USD 592

Viewed 12 hrs ago

Denver (DEN)London (LON)Round trip
/
Economy
Mar 10 2026 - Mar 20 2026

From

USD 592

Viewed 12 hrs ago

Denver (DEN)London (LON)Round trip
/
Economy
Mar 13 2026 - Mar 16 2026

From

USD 592

Viewed 12 hrs ago

*Fares displayed have been collected within the last 72hrs and may no longer be available at the time of booking. We display fares for Economy Light as standard but it is possible to change your class of service during the booking process. You can also add baggage, meals and extra legroom to your trip during booking.

Traveling to London

the iconic Big Ben clock tower in central london

Flying to London

Planning your trip from the US to the UK? Icelandair offers convenient flights from Denver to London. You’ll arrive at either London Heathrow (LHR) or London Gatwick (LGW) — two of the city’s major international airports. Both offer excellent transport links to the city centre, frequent departures, and a wide range of airport services for travelers.

Heathrow is the UK’s busiest airport and offers more flight options and flexibility for your travel dates. On the other hand, Gatwick is the smaller of the two and is often less crowded and offers a quicker journey through the terminal. Whether you're searching for flights from Denver to LHR or exploring other UK routes, both airports offer easy access to central London via express trains, buses, or taxis.

Top attractions in London

From world-famous landmarks to hidden hot-spots, London has something for every kind of traveler. History lovers can get lost in the Tower of London, Westminster Abbey, or the National History Museum, while fans of the art can catch a plethora of performances in the West End or admire masterpieces in the National Gallery.

Stroll through Hyde Park, shop along the famous Oxford Street, or enjoy skyline views from the London Eye. Foodies are in safe hands too. Borough Market have an eclectic mix of international cuisines that will tantalise your taste buds or the city’s countless pubs and cafes offer a taste for the local flavors.

westminster underground station with abbey in background and classic red phone booth in foreground
the city of london seen from the air

Flights from Denver to London

Take the stress out of long-haul trips when you fly from Denver to London with Icelandair. With Wi-Fi access on most aircrafts, a variety of tempting treats, and comfortable blankets and pillows – not to mention excellent in-flight entertainment – all you need to do is sit back, relax, and enjoy the ride.

Add a stopover in Iceland to your journey

Icelandair offers regular flights from Denver, Colorado, to London, England via our hub in Keflavík, Iceland. Turn your trip into a two-in-one getaway. When you fly from Denver to London with Icelandair, you can stopover in Iceland to your travel plans with no extra airfare. Stay for a maximum of seven days, which will give you plenty of time to explore our country’s natural beauty, from cascading waterfalls and magical northern lights, to the vibrant energy of Reykjavík, Iceland’s charming capital city. Whether you spend a day in Reykjavík exploring the unique Nordic cuisine and culture or a whole week, you won’t be disappointed.

students go punting on the thames on a spring day

FAQs about travel from Denver to London

Helpful information for travelers visiting London from the US

How long is the flight from Denver to London?

The typical Denver to London flight time, including a brief layover in our Keflavík hub, is around 12 hours. The first leg of the journey from Denver to Keflavík is approximately 7 hours, with a 2-hour long layover in KEF. The final leg to London is approximately 3 hours.

Can you get direct flights from Denver to London?

All Icelandair flights have a stopover in Keflavík Airport (KEF), which allows you to explore everything this island has to offer, or simply enough time for a short break rest and recharge between long-haul flights.

What is the time difference between Denver and London?

London is seven hours ahead of Denver. When you land from your Denver to UK flight, adjusting to the new time zone can sometimes take a toll. Read our Wellness Travel Report for tips on coping with jet lag as you cross time zones, especially if you’re arriving after a long-haul overnight flight.

When is the best time to book flights to London from Denver?

London’s off seasons (April-May and September-October) usually offer better value on tickets from London to Denver and vice versa when it comes to booking flights and accommodation.

Booking during these low seasons can help you find cheap flights from Denver to London. Alternatively, check our flight deals regularly, especially if you’re looking for discounted Denver to London one way fares.

Does Icelandair offer flights from Denver to London Heathrow?

Icelandair offers regular flights from Denver to LHR, with an easy connection via Iceland. You can fly from Denver International Airport (DEN) to both Heathrow Airport (LHR) and Gatwick Airport (LGW), so you can choose a route that’s convenient for you.