Cheap Flights from Denver International 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 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 $1,358. Find the lowest prices on one-way and return tickets right here.

London.$1,200 per passenger.Departing Fri, 23 Oct, returning Mon, 26 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Fri, 23 Oct, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Mon, 26 Oct, arriving in Denver International.Price includes taxes and charges.From $1,200, select.

London.$1,205 per passenger.Departing Tue, 1 Dec, returning Tue, 8 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Tue, 1 Dec, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Tue, 8 Dec, arriving in Denver International.Price includes taxes and charges.From $1,205, select.

London.$1,205 per passenger.Departing Fri, 6 Nov, returning Mon, 16 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Fri, 6 Nov, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Mon, 16 Nov, arriving in Denver International.Price includes taxes and charges.From $1,205, select.

London.$1,206 per passenger.Departing Wed, 18 Nov, returning Wed, 2 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Wed, 18 Nov, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 2 Dec, arriving in Denver International.Price includes taxes and charges.From $1,206, select.

London.$1,206 per passenger.Departing Thu, 29 Oct, returning Sun, 1 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Thu, 29 Oct, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sun, 1 Nov, arriving in Denver International.Price includes taxes and charges.From $1,206, select.

London.$1,221 per passenger.Departing Fri, 25 Sep, returning Sun, 4 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Fri, 25 Sep, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sun, 4 Oct, arriving in Denver International.Price includes taxes and charges.From $1,221, select.

London.$1,233 per passenger.Departing Tue, 27 Oct, returning Tue, 1 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Tue, 27 Oct, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Tue, 1 Dec, arriving in Denver International.Price includes taxes and charges.From $1,233, select.

London.$1,289 per passenger.Departing Sun, 13 Sep, returning Wed, 30 Sep.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Sun, 13 Sep, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 30 Sep, arriving in Denver International.Price includes taxes and charges.From $1,289, select.

London.$1,295 per passenger.Departing Tue, 25 Aug, returning Wed, 2 Sep.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Tue, 25 Aug, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 2 Sep, arriving in Denver International.Price includes taxes and charges.From $1,295, select.

London.$1,326 per passenger.Departing Sun, 29 Nov, returning Sat, 9 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Sun, 29 Nov, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sat, 9 Jan, arriving in Denver International.Price includes taxes and charges.From $1,326, select.

London.$1,335 per passenger.Departing Sat, 6 Mar, returning Sat, 13 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Sat, 6 Mar, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sat, 13 Mar, arriving in Denver International.Price includes taxes and charges.From $1,335, select.

London.$1,335 per passenger.Departing Sat, 20 Feb, returning Sat, 27 Feb.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Sat, 20 Feb, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sat, 27 Feb, arriving in Denver International.Price includes taxes and charges.From $1,335, select.

London.$1,337 per passenger.Departing Sat, 2 Jan, returning Sun, 17 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Sat, 2 Jan, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sun, 17 Jan, arriving in Denver International.Price includes taxes and charges.From $1,337, select.

London.$1,338 per passenger.Departing Thu, 31 Dec, returning Mon, 11 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Thu, 31 Dec, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Mon, 11 Jan, arriving in Denver International.Price includes taxes and charges.From $1,338, select.

London.$1,338 per passenger.Departing Wed, 24 Feb, returning Wed, 3 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Wed, 24 Feb, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 3 Mar, arriving in Denver International.Price includes taxes and charges.From $1,338, select.

London.$1,343 per passenger.Departing Wed, 21 Apr, returning Wed, 28 Apr.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Wed, 21 Apr, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 28 Apr, arriving in Denver International.Price includes taxes and charges.From $1,343, 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	$1,200
Cheapest month to fly	October
Average flight time	9 hrs, 5 mins
Most popular airline	Lufthansa
Average flights per week	113

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 $1,200. 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 5 minutes is the average flight time from Denver International to London Heathrow.

Which airlines fly direct from Denver International to London Heathrow?

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

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

As of July 2026, there are 113 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 October.

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, 23 October 2026.

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

Yes – the average flight time is 9 hours and 5 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 Iberia offer the cheapest flight tickets to London Heathrow.

Flying 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.
The timezone in London is UTC+0, which is seven hours ahead of Denver.
Each week, there are 18 Denver International Airport to London Heathrow Airport flights. If you'd like to get going as soon as possible, pick the 17:30 British Airways flight. If you're eager to make the most of your day before flying, the last flight is at 20:20 with United Airlines.
Your DEN to LHR flight won't wait if you're late, so get to the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.
Be prepared for bigger queues during popular months such as July. Arriving up to four hours ahead of international flights and two hours for domestic departures will help ensure a smooth travel experience.
Jetting into London (and then seeing more of the United Kingdom!) is a snap with United. This popular airline has direct flights from Denver International Airport to London Heathrow Airport.
The majority of passengers choose to fly with United on this route.
United is the most punctual carrier offering DEN to LHR flights. A reliable 84.06% of its services on this route land as scheduled.
Think about adding a stopover when booking your ticket from Denver International Airport to London Heathrow Airport. Simply uncheck 'Direct flights only' to break up your journey, or maybe even explore a new city along the way. Here are some options between DEN and LHR:
- Chicago O'Hare International Airport
- Detroit Wayne County Airport
- Minneapolis St Paul Airport

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

Right now, $473 is the lowest price we've found for a one-way Denver International Airport to London Heathrow Airport flight. The best price for a return plane ticket is $1,200. Remember that fares can change due to demand at the time of booking.
To get cheap tickets from DEN to LHR, reserve your trip five months ahead of your departure.
The cheapest month for flights from Denver International Airport to London Heathrow Airport is October. Use the 'Whole month' tool to find the lowest airfares if you have flexible dates.
Picking up cheap flights from DEN to LHR is a cinch with Price Alerts. Simply create one of these automatic alerts and we'll let you know when fares go down.
Tailor your trip using filters. Pick your ideal departure and arrival times, airlines and total journey duration. You can also sort the results by 'Best,' 'Cheapest' or 'Fastest' flights from Denver International Airport to London Heathrow Airport.

Handy information about Denver International Airport (DEN)

You'll find DEN at 8500 Pena Boulevard.
80% of flights leaving Denver International Airport land at their destination as planned. Given its impressive on-time stats, you're unlikely to face delays when taking off from DEN.
Central Denver to Denver International Airport is around 40 kilometres. Depending on traffic, it'll take you about 35 minutes to get there if you're catching a taxi, ride-sharing or driving.
The journey on public transport will take about 35 minutes.
Get your flight from Denver International Airport to London Heathrow Airport off to an easy start. Only a short drive from DEN, stay at Baymont by Wyndham Denver International Airport and be well-rested for the trip ahead.

Arriving at London Heathrow Airport (LHR)

The last thing you need is a long journey to your hotel if you're landing late on a Denver International Airport to London Heathrow Airport flight. Stay at one of these accommodation options near LHR instead:
Fast-track your adventure by picking up a London Heathrow Airport rental car. Grab your wheels from Surprice, U-Save or Green Motion to explore London and beyond.
Get the best deal by reserving your vehicle from London Heathrow Airport about one week ahead of your departure.

Getting from London Heathrow Airport (LHR) to central London

London Heathrow Airport is approximately 24 kilometres from central London. The drive time takes around 45 minutes.
It'll take around 25 minutes if you're travelling on public transport.

When to fly to London Heathrow Airport (LHR)

July is the most popular month for flights from Denver International Airport to London Heathrow Airport. To skip the crowds, travel to London in March.
When booking your flight from Denver International Airport to London Heathrow Airport, consider the type of weather you enjoy. July is the warmest month in London, with the temperature ranging from 11ºC to 26ºC.
January sees average temperatures of between 0ºC and 9ºC. Look for cheap tickets from DEN to LHR sometime then if you like cooler conditions.

Explore more of the United Kingdom

Manchester is just one of the many cities in the United Kingdom waiting to be explored after you've seen London. Around 257 kilometres away to the north-west, top sights here include Manchester United Museum & Stadium Tour, The Homes of Football and Museum of Science and Industry.
Birmingham is another must-experience destination in the United Kingdom and is around 161 kilometres north-west of London. No journey is complete without seeing Birmingham Museum & Art Gallery, Birmingham Hippodrome Theatre and Bournville Experience.