Cheap Flights from London Heathrow to Denver International

Compare London Heathrow to Denver International flight deals

Find the cheapest month or even day of the year to fly to Denver International

Book the best Denver International fare with no extra fees

Flight deals from London Heathrow to Denver International

Looking for a cheap last-minute deal or the best return flight from London Heathrow Airport to Denver International Airport? If you want to travel next month, return fares start from $1,448. Find the lowest prices on one-way and return tickets right here.

Denver.$1,368 per passenger.Departing Mon, 28 Sep, returning Tue, 6 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 28 Sep, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Tue, 6 Oct, arriving in London Heathrow.Price includes taxes and charges.From $1,368, select.

Denver.$1,374 per passenger.Departing Tue, 8 Sep, returning Wed, 18 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 8 Sep, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Wed, 18 Nov, arriving in London Heathrow.Price includes taxes and charges.From $1,374, select.

Denver.$1,392 per passenger.Departing Tue, 1 Sep, returning Tue, 15 Sep.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 1 Sep, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Tue, 15 Sep, arriving in London Heathrow.Price includes taxes and charges.From $1,392, select.

Denver.$1,423 per passenger.Departing Fri, 5 Jun, returning Fri, 19 Jun.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Fri, 5 Jun, arriving in Denver International.Inbound indirect flight with Aer Lingus, departs from Denver International on Fri, 19 Jun, arriving in London Heathrow.Price includes taxes and charges.From $1,423, select.

Denver.$1,436 per passenger.Departing Mon, 4 May, returning Fri, 5 Jun.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Mon, 4 May, arriving in Denver International.Inbound indirect flight with Aer Lingus, departs from Denver International on Fri, 5 Jun, arriving in London Heathrow.Price includes taxes and charges.From $1,436, select.

Denver.$1,448 per passenger.Departing Mon, 4 May, returning Sun, 10 May.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Mon, 4 May, arriving in Denver International.Inbound indirect flight with Aer Lingus, departs from Denver International on Sun, 10 May, arriving in London Heathrow.Price includes taxes and charges.From $1,448, select.

Denver.$1,463 per passenger.Departing Tue, 8 Dec, returning Tue, 22 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 8 Dec, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Tue, 22 Dec, arriving in London Heathrow.Price includes taxes and charges.From $1,463, select.

Denver.$1,463 per passenger.Departing Tue, 6 Oct, returning Tue, 13 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 6 Oct, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Tue, 13 Oct, arriving in London Heathrow.Price includes taxes and charges.From $1,463, select.

Denver.$1,463 per passenger.Departing Tue, 24 Nov, returning Thu, 3 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 24 Nov, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Thu, 3 Dec, arriving in London Heathrow.Price includes taxes and charges.From $1,463, select.

Denver.$1,463 per passenger.Departing Wed, 4 Nov, returning Wed, 11 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Wed, 4 Nov, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Wed, 11 Nov, arriving in London Heathrow.Price includes taxes and charges.From $1,463, select.

Denver.$1,463 per passenger.Departing Wed, 28 Oct, returning Wed, 4 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Wed, 28 Oct, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Wed, 4 Nov, arriving in London Heathrow.Price includes taxes and charges.From $1,463, select.

Denver.$1,466 per passenger.Departing Mon, 1 Mar, returning Tue, 9 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 1 Mar, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Tue, 9 Mar, arriving in London Heathrow.Price includes taxes and charges.From $1,466, select.

Denver.$1,466 per passenger.Departing Mon, 1 Feb, returning Mon, 15 Feb.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 1 Feb, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Mon, 15 Feb, arriving in London Heathrow.Price includes taxes and charges.From $1,466, select.

Denver.$1,467 per passenger.Departing Tue, 26 Jan, returning Wed, 3 Feb.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 26 Jan, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Wed, 3 Feb, arriving in London Heathrow.Price includes taxes and charges.From $1,467, select.

Denver.$1,472 per passenger.Departing Mon, 11 Jan, returning Mon, 18 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 11 Jan, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Mon, 18 Jan, arriving in London Heathrow.Price includes taxes and charges.From $1,472, select.

Denver.$1,483 per passenger.Departing Tue, 15 Sep, returning Mon, 15 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 15 Sep, arriving in Denver International.Inbound indirect flight with Icelandair, departs from Denver International on Mon, 15 Mar, arriving in London Heathrow.Price includes taxes and charges.From $1,483, select.

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

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

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Direct flights from London Heathrow to Denver International

London Heathrow to Denver International: Alternative routes

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

London to Denver: Flight information

The things to know before you go.

Cheapest flight found	$1,368
Cheapest month to fly	September
Average flight time	9 hrs, 52 mins
Most popular airline	Air Canada
Average flights per week	106

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

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

The best price we found for a return flight from London Heathrow to Denver International is $1,368. 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 London Heathrow to Denver International?

9 hours and 52 minutes is the average flight time from London Heathrow to Denver International.

Which airlines fly direct from London Heathrow to Denver International?

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

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

As of April 2026, there are 106 flights per week flying from London Heathrow to Denver International.

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

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

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

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Denver International Airport on Monday, 28 September 2026.

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

Yes – the average flight time is 9 hours and 52 minutes.

How can I find the best flight deal to Denver International?

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 Denver International 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 Denver?

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

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

Currently, Icelandair and Brussels Airlines offer the cheapest flight tickets to Denver International.

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

Around 9 hours 50 minutes is how long you can expect to be in the air on a direct flight from London Heathrow Airport to Denver International Airport.
Denver is six hours behind London and is in the UTC-6 timezone.
Every week, there are 27 London Heathrow Airport to Denver International Airport flights. If you prefer to be on board early, pick the 11:05 United Airlines flight. If you'd rather make the most of your time before flying, the last flight is at 14:50 with United Airlines.
For a smooth journey, turn up at the airport two hours ahead of international flights and one hour before domestic departures. This will give you enough time to board your LHR to DEN flight.
You can expect longer queues during popular months such as July. Arriving up to four hours ahead of international flights and two hours for a domestic departure is a good idea.
Flying into Denver (and then exploring more of United States!) is easy with British Airways. This popular carrier offers direct flights from London Heathrow Airport to Denver International Airport.
British Airways is the airline most travellers choose to fly with on this route.
With an impressive 95.08% of services arriving on schedule, United Airlines has the best on-time performance for LHR to DEN flights.
Consider adding a stopover when booking your ticket from London Heathrow Airport to Denver International Airport. Just uncheck 'Direct flights only' to break up your trip, or visit a new city along the way. Here's where you can stop between LHR and DEN:
- Minneapolis-St. Paul International Airport
- O'Hare International Airport
- Keflavik International Airport

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

$940 is currently the best price for a one-way London Heathrow Airport to Denver International Airport flight. Return flights start from $1,368. These fares may change depending on demand and availability.
Score cheap tickets from LHR to DEN by booking at least six months ahead. Based on our research, that's the sweet spot for bagging a bargain.
The cheapest month for flights from London Heathrow Airport to Denver International Airport is May. Use the 'Whole month' tool to see the lowest prices if you have flexible travel dates.
You won't have to check every day to see if fares have gone down when you create a Price Alert. We'll let you know as soon as there's a new deal on cheap flights from LHR to DEN.
Pick your ideal arrival and departure times, number of stops and airlines with the filters. Alternatively, sort your results by 'Cheapest' to get the best deals on flights from London Heathrow Airport to Denver International Airport.

Handy information about London Heathrow Airport (LHR)

When it comes to London Heathrow Airport's on-time performance, data shows 68.18% of flights arrive within the expected timeframe.
To get to London Heathrow Airport from central London, it'll take around 55 minutes by car. Of course, this depends on traffic conditions. It's approximately 31 kilometres from the airport to the city centre.
Catching public transport? You can expect a journey time of around 1 hour.
Taking an early flight from London Heathrow Airport to Denver International Airport? Avoid the stress of rushing to the terminal (and get some extra shut-eye) by choosing one of these hotels near LHR:

Arriving at Denver International Airport (DEN)

Once your London Heathrow Airport to Denver International Airport flight has arrived, kick back at a nearby hotel. Baymont by Wyndham Denver International Airport is a good option within easy reach of DEN.
Pick up a Denver International Airport rental car and discover Denver and beyond with your own wheels. Routes Car Rentals, Dollar and Budget are top outlets to choose from here.
To secure the lowest price, book your ride from Denver International Airport about one week before you travel.

Getting from Denver International Airport (DEN) to central Denver

The street address for DEN is 8500 Pena Boulevard.
Denver International Airport is approximately 40 kilometres from central Denver. Driving there takes about 35 minutes.
It takes around 1 hour 30 minutes if you're travelling on public transport.

When to fly to Denver International Airport (DEN)

July is the most popular month for flights from London Heathrow Airport to Denver International Airport. To escape the crowds, visit Denver in April.
Book your flight from London Heathrow Airport to Denver International Airport for July if you want to visit Denver during its warmest month. You can expect temperatures of between 14ºC and 32ºC.
Look for cheap tickets from LHR to DEN in January if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between -9ºC and 7ºC on average.

Explore more of United States

Colorado Springs is just one of the many places in United States waiting to be discovered once you've taken in the sights of Denver. Around 105 kilometres away to the south, top sights here include US Northern Command (USNORTHCOM) / North American Aerospace Defence Command (NORAD) Headquarters, Cheyenne Mountain Air Force Station and National Strength and Conditioning Association (NSCA).
Around 13 kilometres east of Denver, Aurora is another favourite stop in United States. Get a taste of what this destination has to offer at Magellan's Travel Solutions and Gear, The Fairways at Lowry and Retired Enlisted Association Inc.