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

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Flight deals from London Heathrow to Denver International

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

Denver.$545 per passenger.Departing Fri, Nov 21, returning Sun, Nov 23.Round-trip flight with Lufthansa.Outbound indirect flight with Lufthansa, departing from London Heathrow on Fri, Nov 21, arriving in Denver International.Inbound indirect flight with Lufthansa, departing from Denver International on Sun, Nov 23, arriving in London Heathrow.Price includes taxes and charges.From $545, select.

Denver.$545 per passenger.Departing Sat, Nov 22, returning Tue, Dec 2.Round-trip flight with Lufthansa.Outbound indirect flight with Lufthansa, departing from London Heathrow on Sat, Nov 22, arriving in Denver International.Inbound indirect flight with Lufthansa, departing from Denver International on Tue, Dec 2, arriving in London Heathrow.Price includes taxes and charges.From $545, select.

Denver.$546 per passenger.Departing Wed, May 6, returning Mon, May 18.Round-trip flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departing from London Heathrow on Wed, May 6, arriving in Denver International.Inbound indirect flight with Aer Lingus, departing from Denver International on Mon, May 18, arriving in London Heathrow.Price includes taxes and charges.From $546, select.

Denver.$547 per passenger.Departing Wed, Oct 29, returning Wed, Dec 10.Round-trip flight with Lufthansa and Austrian Airlines.Outbound indirect flight with Lufthansa, departing from London Heathrow on Wed, Oct 29, arriving in Denver International.Inbound indirect flight with Austrian Airlines, departing from Denver International on Wed, Dec 10, arriving in London Heathrow.Price includes taxes and charges.From $547, select.

Denver.$558 per passenger.Departing Sat, Jan 24, returning Sat, Jan 31.Round-trip flight with Lufthansa.Outbound indirect flight with Lufthansa, departing from London Heathrow on Sat, Jan 24, arriving in Denver International.Inbound indirect flight with Lufthansa, departing from Denver International on Sat, Jan 31, arriving in London Heathrow.Price includes taxes and charges.From $558, select.

Denver.$560 per passenger.Departing Thu, Jan 22, returning Thu, Jan 29.Round-trip flight with British Airways.Outbound direct flight with British Airways departing from London Heathrow on Thu, Jan 22, arriving in Denver International.Inbound direct flight with British Airways departing from Denver International on Thu, Jan 29, arriving in London Heathrow.Price includes taxes and charges.From $560, select.

Denver.$560 per passenger.Departing Tue, Oct 7, returning Tue, Oct 14.Round-trip flight with SWISS and Brussels Airlines.Outbound indirect flight with SWISS, departing from London Heathrow on Tue, Oct 7, arriving in Denver International.Inbound indirect flight with Brussels Airlines, departing from Denver International on Tue, Oct 14, arriving in London Heathrow.Price includes taxes and charges.From $560, select.

Denver.$562 per passenger.Departing Fri, Oct 31, returning Sun, Nov 2.Round-trip flight with Austrian Airlines.Outbound indirect flight with Austrian Airlines, departing from London Heathrow on Fri, Oct 31, arriving in Denver International.Inbound indirect flight with Austrian Airlines, departing from Denver International on Sun, Nov 2, arriving in London Heathrow.Price includes taxes and charges.From $562, 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 November.

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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	$545
Cheapest month to fly	November
Average flight time	9 hrs, 51 mins
Most popular airline	United
Average flights per week	84

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

How much are round-trip flights from London Heathrow to Denver International?

The best price we found for a round-trip flight from London Heathrow to Denver International is $545. 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 51 minutes is the average flight time from London Heathrow to Denver International.

Which airlines fly direct from London Heathrow to Denver International?

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

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

There are 84 flights per week flying from London Heathrow to Denver International, as of September 2025.

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 November.

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 Saturday, November 22, 2025.

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

Yes – the average flight time is 9 hours and 51 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 with from London Heathrow Airport to Denver International?

Currently, Lufthansa and British Airways offer the cheapest flight tickets to Denver International.

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

The average length of a direct flight from London Heathrow Airport to Denver International Airport is 9 hours 50 minutes.
The timezone in Denver is UTC-6, which is six hours behind London.
Choose from 27 weekly London Heathrow Airport to Denver International Airport flights. The 11:05 departure with United Airlines is the earliest flight available. United Airlines operates the latest service of the day at 14:50.
Give yourself plenty of time to make your LHR to DEN flight. As a general rule, arrive two hours before international departures and an hour ahead for domestic flights.
Traveling during a peak month like July? Major public holidays and other popular seasons can result in longer queues and delays at airport checkpoints. Be extra cautious and get there up to four hours before international flights and two hours before domestic departures.
British Airways has direct flights from London Heathrow Airport to Denver International Airport. Book with this popular airline, then get ready to check out the sights in Denver — and maybe even more of United States if your schedule allows.
Most travelers choose to travel with British Airways on this route.
United Airlines ranks as the leading on-time carrier for LHR to DEN flights, with 95.08% of its services arriving as scheduled.
If you want to add a stop to your trip, simply uncheck 'Direct flights only' when searching for your ticket from London Heathrow Airport to Denver International Airport. These are the most popular stopovers 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)

$401 is currently the lowest price for a one-way London Heathrow Airport to Denver International Airport flight. A return flight starts from $545. These prices may change depending on demand and availability.
Get cheap tickets from LHR to DEN by booking six months ahead. Based on our research, that's the sweet spot for finding the biggest deals.
Schedule your trip for May. That's the cheapest month for flights from London Heathrow Airport to Denver International Airport. If you have flexibility with your dates, try out the 'Whole month' tool to find the cheapest airfare across each month.
Save time looking for cheap flights from LHR to DEN by setting up a Price Alert. You'll get an email or notification on the app when a special offer becomes available.
Choose your preferred arrival and departure times, airlines and number of stops with the filters. Alternatively, sort your results by 'Cheapest' to see the best deals on flights from London Heathrow Airport to Denver International Airport.

Handy information about London Heathrow Airport (LHR)

When it comes to the on-time performance of London Heathrow Airport, 68.18% of flights stick to their scheduled arrival time.
Central London to London Heathrow Airport is around 31 kilometers. Depending on traffic, it'll take you about 55 minutes to get there if you're driving, catching a cab or ride-sharing.
The trip when using public transport usually takes 1 hour.
Have an early flight from London Heathrow Airport to Denver International Airport? Avoid the hassle of rushing to the terminal (and get some extra shut-eye) by choosing one of these stays close to LHR:

Arriving at Denver International Airport (DEN)

Hop off your London Heathrow Airport to Denver International Airport flight and be snoozing in your hotel bed soon after. If you're searching for a convenient option within easy reach of DEN, make your way to Baymont by Wyndham Denver International Airport.
Grab a Denver International Airport rental car and explore Denver and beyond with your own set of wheels. Routes Car Rentals, Dollar and Budget are well-known companies to choose from here.
Lock in the best deal by reserving your vehicle from Denver International Airport about one week before your travel date.

Getting from Denver International Airport (DEN) to central Denver

DEN is located at 8500 Pena Boulevard.
From Denver International Airport, Denver is approximately 40 kilometers away. It takes around 35 minutes to get to the center driving.
Traveling to the center by public transport typically takes 1 hour 30 minutes.

When to fly to Denver International Airport (DEN)

The quietest month for a flight from London Heathrow Airport to Denver International Airport is April, while July is the busiest. Choose the ideal time to visit Denver based on whether you prefer a more relaxed vibe or a faster pace.
Lock in your flight from London Heathrow Airport to Denver International Airport for July if you want to visit Denver during its warmest month. Expect temperatures of between 14ºC (57ºF) and 32ºC (90ºF).
January sees average temperatures of between -9ºC (16ºF) and 7ºC (45ºF). Look for cheap tickets from LHR to DEN around that time if you want to travel in cooler conditions.

Explore more of United States

Denver has loads to offer, but there are so many other parts of United States waiting to be explored. About 105 kilometers south of Denver, a visit to Colorado Springs will keep you on the go. Start with leading attractions like US Northern Command (USNORTHCOM) / North American Aerospace Defense Command (NORAD) Headquarters, Cheyenne Mountain Air Force Station and National Strength and Conditioning Association (NSCA).
If you want to check out another major stop in United States, consider Aurora, about 13 kilometers east of Denver. Magellan's Travel Solutions and Gear, The Fairways at Lowry and Retired Enlisted Association Inc are among its highlights.