£444 Cheap Flights from Denver International (DEN) to London Heathrow (LHR)

Q: 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 £444. 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.

Q: 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.

Q: Which airlines fly direct from Denver International to London Heathrow?

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

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

As of March 2025, there are 156 flights per week flying from Denver International to London Heathrow.

Q: 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 March 2025.

Q: 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 Friday, 9 May 2025 .

Q: 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.

Q: 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.

Q: 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.

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

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

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 Cheapest month Find the best route Route info FAQs Tips and advice

Flight deals from Denver International to London Heathrow

Looking for a cheap last-minute deal or the best return flight from Denver International to London Heathrow? Find the lowest prices on one-way and return tickets right here.

London.£444 per passenger.Departing Fri, 9 May, returning Thu, 28 Aug.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Fri, 9 May, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Thu, 28 Aug, arriving in Denver International.Price includes taxes and charges.From £444, select.

London.£447 per passenger.Departing Fri, 17 Oct, returning Fri, 24 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Fri, 17 Oct, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Fri, 24 Oct, arriving in Denver International.Price includes taxes and charges.From £447, select.

London.£456 per passenger.Departing Sat, 26 Apr, returning Fri, 16 May.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Sat, 26 Apr, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Fri, 16 May, arriving in Denver International.Price includes taxes and charges.From £456, select.

London.£457 per passenger.Departing Thu, 27 Mar, returning Mon, 5 May.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Thu, 27 Mar, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Mon, 5 May, arriving in Denver International.Price includes taxes and charges.From £457, select.

London.£465 per passenger.Departing Tue, 13 May, returning Tue, 20 May.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Tue, 13 May, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Tue, 20 May, arriving in Denver International.Price includes taxes and charges.From £465, select.

London.£466 per passenger.Departing Wed, 23 Apr, returning Wed, 30 Apr.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from Denver International on Wed, 23 Apr, arriving in London Heathrow.Inbound indirect flight with Aer Lingus, departs from London Heathrow on Wed, 30 Apr, arriving in Denver International.Price includes taxes and charges.From £466, select.

London.£467 per passenger.Departing Sun, 6 Apr, returning Tue, 22 Apr.Return flight with Iberia.Outbound direct flight with Iberia departs from Denver International on Sun, 6 Apr, arriving in London Heathrow.Inbound direct flight with Iberia departs from London Heathrow on Tue, 22 Apr, arriving in Denver International.Price includes taxes and charges.From £467, select.

London.£469 per passenger.Departing Tue, 7 Oct, returning Fri, 17 Oct.Return flight with Iberia.Outbound direct flight with Iberia departs from Denver International on Tue, 7 Oct, arriving in London Heathrow.Inbound direct flight with Iberia departs from London Heathrow on Fri, 17 Oct, arriving in Denver International.Price includes taxes and charges.From £469, 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 October.

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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	£444
Cheapest month to fly	May
Average flight time	9 hrs, 4 mins
Most popular airline	Air Canada
Average flights per week	156

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

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

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

Which airlines fly direct from Denver International to London Heathrow?

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

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

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

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

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

When is the best time to book flights to London?

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

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

A direct flight from Denver International Airport to London Heathrow Airport takes an average of 9 hours 5 minutes. The timezone in London is UTC+0, which makes it 6 hours ahead of Denver.
You can choose from 26 weekly flights from Denver International Airport to London Heathrow Airport. The 11:05 departure with United Airlines is the earliest flight you can take from DEN to LHR. United Airlines operates the last service of the day at 20:20 if early starts aren't your thing.
During popular months like July, you'll want to get to the airport well in advance. Plan to arrive two hours before a domestic departure and four hours ahead of international flights when you travel during a peak period in general.
United Airlines is your gateway to exploring London (and maybe even some other exciting parts of United Kingdom!). Browse the direct flights from Denver International Airport to London Heathrow Airport offered by this airline.
If you'd like to break up your flight from Denver International Airport to London Heathrow Airport, think about adding a stopover. Just uncheck 'Direct flights only' to find a city that interests you. The top stopovers on the DEN - LHR route include:
- Detroit Metropolitan Wayne County Airport
- Minneapolis-St. Paul International Airport
- O'Hare International Airport

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

The lowest price we've seen for a one-way ticket from Denver International Airport to London Heathrow Airport is £180. For a return flight on this route, the best price is £444. Depending on the availability when you book, these fares may change.
Get cheap tickets from DEN to LHR by booking 2 months ahead. Based on our research, that's the sweet spot for finding the biggest deals.
The cheapest month for tickets from Denver International Airport to London Heathrow Airport is October. Use the 'Whole month' tool to find the lowest prices if you have flexible travel dates.
Finding a cheap ticket from DEN to LHR is straightforward with Price Alerts. Simply set up one of these automatic alerts and we'll notify you when the price has fallen.
Take advantage of filters to find the right trip for you. To see the 'Fastest,' 'Best' or 'Cheapest' flights from Denver International Airport to London Heathrow Airport, use the 'Sort by' tool. You can also filter results by airline, arrival and departure times, and number of stops.

Handy information about Denver International Airport (DEN)

Denver International Airport is around 25 miles from central Denver. If you're catching a cab, driving or ride-sharing from the centre, it'll take you 34 minutes or so to get there, depending on the traffic. If you're taking public transport, expect the journey time to be around 1 hour and 31 minutes.
Searching for a hotel to stay in before your flight from Denver International Airport to London Heathrow Airport? Consider SpringHill Suites Denver Airport. Enjoy a good night's rest here before making your way to DEN.

Arriving at London Heathrow Airport (LHR)

Consider staying in a hotel close to LHR if you're catching a late flight from Denver International Airport to London Heathrow Airport. Pick one of these accommodation options and skip the long transfer:

Getting from London Heathrow Airport (LHR) to central London

From London Heathrow Airport, London is approximately 19 miles away. It takes around 57 minutes to get to the centre driving.
Travelling by public transport will take you roughly 1 hour and 1 minute.

When to fly to London Heathrow Airport (LHR)

The quietest month for a flight from Denver International Airport to London Heathrow Airport is February, while July is the most popular. Choose the best time to visit London based on whether you prefer a laid-back vibe or a more bustling atmosphere.
The warmest month in London is July, with the temperature ranging between 11ºC and 26ºC. Book your flights from Denver International Airport to London Heathrow Airport in this month if this is the type of weather you like.
Search for cheap tickets from DEN to LHR in January if you want to travel in cooler conditions. Temperatures are at their lowest around then, ranging between 0ºC and 9ºC on average.

More about London

Start your London trip right by finding a great stay. As soon as you've booked your flight from DEN to LHR, check out our selection of hotel options including:
Big Ben and The British Museum are just the start of the major attractions to add to your London must-do list. Continue your sightseeing adventures at Buckingham Palace.

Complete your London trip with hotels and a car rental

Comparing flights is not the only thing we do. Once you've booked your cheap ticket to London Heathrow Airport, explore our great car rental offers that'll give you the flexibility and freedom to travel around at your own pace. Next, have a look at our exclusive rates for hotels to find the ideal London stay.

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Plan the rest of your trip from Denver to London

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.

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

Flight deals from Denver International to London Heathrow

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

Direct flights from Denver International to London Heathrow

Denver International to London Heathrow: Alternative routes

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London Gatwick

London Luton

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London Southend

Denver to London: Flight information

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

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

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

Which airlines fly direct from Denver International to London Heathrow?

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

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

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

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

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

When is the best time to book flights to London?

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

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

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

Handy information about Denver International Airport (DEN)

Arriving at London Heathrow Airport (LHR)

Getting from London Heathrow Airport (LHR) to central London

When to fly to London Heathrow Airport (LHR)

More about London

Complete your London trip with hotels and a car rental

More travel options

Plan the rest of your trip from Denver to London

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Flight deals from Denver International to London Heathrow

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

Direct flights from Denver International to London Heathrow

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

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

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

Which airlines fly direct from Denver International to London Heathrow?

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

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

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

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

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

When is the best time to book flights to London?

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

More travel options

Plan the rest of your trip from Denver to London

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