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

Compare Denver International to London Heathrow flight deals

Find the cheapest month or even day of the year to fly to London Heathrow

Book the best London Heathrow fare with no extra fees

Flight deals from Denver International to London Heathrow

Looking for a cheap last-minute deal or the best return flight from Denver International Airport to London Heathrow Airport? If you want to travel next month, return fares start from £600. Find the lowest prices on one-way and return tickets right here.

London.£271 per passenger.Departing Tue, 5 May.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Tue, 5 May, arriving in London Heathrow.Price includes taxes and charges.From £271, select.

London.£276 per passenger.Departing Mon, 1 Jun.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Mon, 1 Jun, arriving in London Heathrow.Price includes taxes and charges.From £276, select.

London.£286 per passenger.Departing Tue, 1 Dec.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Tue, 1 Dec, arriving in London Heathrow.Price includes taxes and charges.From £286, select.

London.£294 per passenger.Departing Thu, 30 Apr.One-way flight with jetBlue.Outbound indirect flight with jetBlue, departs from Denver International on Thu, 30 Apr, arriving in London Heathrow.Price includes taxes and charges.From £294, select.

London.£297 per passenger.Departing Thu, 9 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Thu, 9 Jul, arriving in London Heathrow.Price includes taxes and charges.From £297, select.

London.£299 per passenger.Departing Sat, 7 Nov.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Sat, 7 Nov, arriving in London Heathrow.Price includes taxes and charges.From £299, select.

London.£305 per passenger.Departing Sun, 6 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Sun, 6 Sep, arriving in London Heathrow.Price includes taxes and charges.From £305, select.

London.£320 per passenger.Departing Tue, 25 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Tue, 25 Aug, arriving in London Heathrow.Price includes taxes and charges.From £320, select.

London.£322 per passenger.Departing Mon, 18 Jan.One-way flight with Lufthansa.Outbound indirect flight with Lufthansa, departs from Denver International on Mon, 18 Jan, arriving in London Heathrow.Price includes taxes and charges.From £322, select.

London.£323 per passenger.Departing Fri, 2 Oct.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Fri, 2 Oct, arriving in London Heathrow.Price includes taxes and charges.From £323, select.

London.£361 per passenger.Departing Wed, 23 Sep.One-way flight with Lufthansa.Outbound direct flight with Lufthansa departs from Denver International on Wed, 23 Sep, arriving in London Heathrow.Price includes taxes and charges.From £361, select.

London.£361 per passenger.Departing Tue, 12 May.One-way flight with Lufthansa.Outbound direct flight with Lufthansa departs from Denver International on Tue, 12 May, arriving in London Heathrow.Price includes taxes and charges.From £361, select.

London.£361 per passenger.Departing Wed, 22 Jul.One-way flight with Lufthansa.Outbound direct flight with Lufthansa departs from Denver International on Wed, 22 Jul, arriving in London Heathrow.Price includes taxes and charges.From £361, select.

London.£371 per passenger.Departing Thu, 16 Apr.One-way flight with Lufthansa.Outbound direct flight with Lufthansa departs from Denver International on Thu, 16 Apr, arriving in London Heathrow.Price includes taxes and charges.From £371, select.

London.£373 per passenger.Departing Mon, 5 Oct.One-way flight with Iberia.Outbound direct flight with Iberia departs from Denver International on Mon, 5 Oct, arriving in London Heathrow.Price includes taxes and charges.From £373, select.

London.£379 per passenger.Departing Wed, 2 Dec.One-way flight with British Airways.Outbound direct flight with British Airways departs from Denver International on Wed, 2 Dec, arriving in London Heathrow.Price includes taxes and charges.From £379, select.

Find the cheapest month to fly from Denver International to London Heathrow

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Denver International to London Heathrow flights are currently cheapest in May.

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Direct flights from Denver International to London Heathrow

Denver International to London Heathrow: Alternative routes

Compare routes from Denver International to London below. You may find an airport to fly into that's cheaper, faster, or easier than London Heathrow.

Denver to London: Flight information

The things to know before you go.

Cheapest flight found	£271
Cheapest month to fly	May
Average flight time	9 hrs, 4 mins
Most popular airline	Air Canada
Average flights per week	105

Finding cheap flights from Denver International to London Heathrow: Frequently asked questions

How much are return flights from Denver International to London Heathrow?

The best price we found for a return flight from Denver International to London Heathrow is £549. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Denver International to London Heathrow?

9 hours and 4 minutes is the average flight time from Denver International to London Heathrow.

Which airlines fly direct from Denver International to London Heathrow?

SWISS, Air Canada and Lufthansa fly direct from Denver International to London Heathrow.

How many flights are there a week from Denver International to London Heathrow?

As of April 2026, there are 105 flights per week flying from Denver International to London Heathrow.

When is the cheapest time to fly from Denver International to London Heathrow?

The cheapest month to fly from Denver International to London Heathrow is usually August.

Which upcoming date is cheapest to fly from Denver International Airport to London Heathrow Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Denver International Airport to London Heathrow Airport on Tuesday, 4 August 2026.

Can I get a direct flight from Denver International Airport to London Heathrow Airport?

Yes – the average flight time is 9 hours and 4 minutes.

How can I find the best flight deal to London Heathrow?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to London Heathrow but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to London?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to London is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Denver International Airport to London Heathrow with?

Currently, Icelandair and Lufthansa offer the cheapest flight tickets to London Heathrow.

Travelling from Denver International Airport (DEN) to London Heathrow Airport (LHR): what you need to know

The average time for a direct flight from Denver International Airport to London Heathrow Airport is 9 hours 5 minutes.
London's timezone is UTC+0, which makes London six hours ahead of Denver.
You can choose from 26 weekly Denver International Airport to London Heathrow Airport flights. The 17:15 departure with British Airways is the earliest flight you can take. United Airlines operates the latest service of the day at 20:20.
Your DEN to LHR flight won't wait if you're running late, so get to the airport with time to spare. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.
You can expect bigger queues in popular months like July. Arriving up to four hours ahead of international flights and two hours for a domestic departure is a good idea.
Getting to London (and then seeing more of United Kingdom!) is easy with British Airways. This popular airline offers direct flights from Denver International Airport to London Heathrow Airport.
Most travellers choose to fly with British Airways on this route.
United Airlines is the most punctual carrier operating DEN to LHR flights. A reliable 91.67% of its services on this route land as scheduled.
If you'd like to add a stop to your trip, just uncheck 'Direct flights only' when searching for your ticket from Denver International Airport to London Heathrow Airport. Here are the most popular stopovers between DEN and LHR:
- Minneapolis-St. Paul International Airport
- O'Hare International Airport
- Detroit Metropolitan Wayne County Airport

How to find the cheapest flights from Denver International Airport (DEN) to London Heathrow Airport (LHR)

The lowest price we've found for a one-way Denver International Airport to London Heathrow Airport flight is £271. A round-trip fare is currently £549. Depending on the availability and when you book, these fares may change.
Book 11 months before flying. After looking at the numbers on our calendar, this is how far you'll want to book ahead to find cheap tickets from DEN to LHR.
October is the cheapest month for flights from Denver International Airport to London Heathrow Airport. If you prefer to travel at a different time of year, the 'Whole month' tool will show you the lowest prices for every month.
Never miss a deal on cheap flights from DEN to LHR by creating a Price Alert. You'll receive an email or notification on the app when a special offer becomes available.
Select your preferred departure and arrival times, number of stops and airlines with the filters. Alternatively, sort your results by 'Cheapest' to get the best deals on flights from Denver International Airport to London Heathrow Airport.

Handy information about Denver International Airport (DEN)

The address for DEN is 8500 Pena Boulevard.
Denver International Airport has a strong on-time performance, so you're less likely to experience disruptions. Departures from DEN land on schedule 80.23% of the time.
Central Denver to Denver International Airport is around 25 miles. Depending on traffic, it'll take about 35 minutes to get there if you're driving, ride-sharing or catching a cab.
Planning to catch public transport? You can expect a journey time of around 1 hour 30 minutes.
Need a hotel to stay in before your flight from Denver International Airport to London Heathrow Airport? Check out Baymont by Wyndham Denver International Airport. Enjoy a good night's sleep here before heading to DEN.

Arriving at London Heathrow Airport (LHR)

If you're getting in on a late Denver International Airport to London Heathrow Airport flight, few things beat the convenience of staying near the terminal. Grab your bags from the carousel and then be showered and resting soon after at one of these accommodation options near LHR:
Go where the road takes you with a London Heathrow Airport rental car. Pick up a set of wheels from Surprice, U-Save or Green Motion and venture far and wide through London and beyond.
Lock in the best possible rate by booking your vehicle from London Heathrow Airport around one week ahead of your departure.

Getting from London Heathrow Airport (LHR) to central London

From London Heathrow Airport, London is approximately 19 miles away. It takes around 55 minutes to reach the centre driving.
Getting there on public transport will take you roughly 1 hour.

When to fly to London Heathrow Airport (LHR)

It's time to pick your dates for your flight from Denver International Airport to London Heathrow Airport. July is the busiest month to head to London. If you like a more laid-back vibe, go in February.
When booking your flight from Denver International Airport to London Heathrow Airport, consider the kind of weather you enjoy. July is the warmest month in London, with the temperature ranging from 11ºC (52ºF) to 26ºC (79ºF).
Look for cheap tickets from DEN to LHR in January if you like cooler conditions. Temperatures are at their lowest around then, ranging between 0ºC (32ºF) and 9ºC (48ºF) on average.

Explore more of United Kingdom

Birmingham is just one of the many cities in United Kingdom waiting to be discovered once you've seen the sights of London. Around 100 miles away to the north-west, its top attractions include Cadbury World, The Library of Birmingham and National Sea Life Centre.
Bristol is another standout destination in United Kingdom and is around 110 miles west of London. No journey is complete without visiting Clifton Suspension Bridge, Cabot Tower and Brandon Hill Nature Park.