How do most travelers feel about United Airlines?

9,683 Cheapflights users have left reviews for United Airlines and have rated the airline 7.4/10. If you are looking to travel from London Heathrow Airport to Denver on United Airlines, input your dates in the form above for our best prices!

Can I get a flight from London Heathrow Airport to Denver on United Airlines for under £590?

Cheapflights users have found 10 United Airlines flights for under £590 on the LHR-DEN route. Prices on flights to Denver from London Heathrow Airport can vary based on many factors including dates. To look at price based on your preferred dates, click here.

How far ahead should I book a flight from London Heathrow Airport to Denver with United Airlines?

Booking with United Airlines 44 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Denver. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from London Heathrow Airport to Denver with United Airlines?

Currently, the most affordable month to book a United Airlines flight from London Heathrow Airport to Denver in September, with an average price of £494. Conversely, traveling with United Airlines from London Heathrow Airport to Denver in December will be the most expensive, with an average cost of £841. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

Weekly United Airlines flight availability from London Heathrow Airport to Denver

The most United Airlines flights from LHR to DEN are scheduled on a Monday (2 on average). You will have fewer United Airlines flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

In terms of precipitation, rainfall in Denver ranges from 13.0 - 58.0 inches per month. May is typically the wettest month, when rainfall can reach 58.0 mm. January is typically the driest time to visit Denver when rainfall is around 13.0 mm.

If weather is an important factor for your trip to Denver, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -1.0 C).

£441+ United Airlines Flights from Heathrow to Denver

Cheapflights users flying from London to Denver on United Airlines typically fly into Denver Intl and depart from London Heathrow. Select your dates above for pricing.

United Airlines flights from Heathrow to Denver in 2026

One-way from	£441
Return from	£647
Popular in	July
Cheapest in	September
Average price (all airlines)	£583

United Airlines
11/7
1 total stop
14h 50m total
London to Denver

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United Airlines
1/9-29/9
1 total stop
22h 50m total
London to Denver

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Highest demand for flights from London Heathrow to Denver Intl; 12% potential price increase.

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Best time to find cheap flights from London Heathrow to Denver Intl; 2% potential price drop.

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Average price for all London Heathrow to Denver Intl flights (one-way and round-trip).

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How do most travelers feel about United Airlines?
9,683 Cheapflights users have left reviews for United Airlines and have rated the airline 7.4/10. If you are looking to travel from London Heathrow Airport to Denver on United Airlines, input your dates in the form above for our best prices!
Can I get a flight from London Heathrow Airport to Denver on United Airlines for under £590?
Cheapflights users have found 10 United Airlines flights for under £590 on the LHR-DEN route. Prices on flights to Denver from London Heathrow Airport can vary based on many factors including dates. To look at price based on your preferred dates, click here.

Find United Airlines flight deals from Heathrow to Denver

Enter your travel dates to find the best prices.

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One-way

Cheapest United Airlines flights from Heathrow to Denver
Explore the most affordable United Airlines flight options available from Heathrow to Denver. Find the lowest fares with prices last updated on 5 May 2026.

Mon 8/607:30

LHR

DEN

1 stop13h 00m

United Airlines

Mon 7/923:59

DEN

LHR

1 stop14h 26m

United Airlines

Deal found 4/5£696

Mon 15/607:30

LHR

DEN

1 stop13h 00m

United Airlines

Mon 22/606:00

DEN

LHR

1 stop16h 55m

United Airlines

Deal found 1/5£738

Mon 8/607:30

LHR

DEN

1 stop13h 00m

United Airlines

Mon 15/617:35

DEN

LHR

Nonstop9h 05m

United Airlines

Deal found 4/5£739

Prices

Airlines

When is the best time to book a flight to Denver with United Airlines?

The best time to book a flight to Denver with United Airlines is 44 days before departure. On average, fares are higher if you book 11 days before departure.

Which month is the cheapest to fly Economy class from London Heathrow Airport to Denver?

For Economy class flights, the cheapest month to fly this route is September. The most expensive months are December and March.

Best time to book a flight from Heathrow to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Heathrow with our price prediction graph.

LHR-DEN

Estimated return price

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9,683 reviews

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United Airlines flights from London Heathrow Airport to Denver (LHR - DEN)

Cheapflights users flying from London to Denver on United Airlines typically fly into Denver Intl and depart from London Heathrow. Select your dates above for pricing.

United Airlines flights from Heathrow to Denver in 2026

Find detailed information about United Airlines flights from Heathrow to Denver. Explore the options provided by United Airlines to plan your journey from Heathrow to Denver. Data last updated 5 May 2026.

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How do most travelers feel about United Airlines?

Can I get a flight from London Heathrow Airport to Denver on United Airlines for under £590?

Find United Airlines flight deals from Heathrow to Denver

Cheapest United Airlines flights from Heathrow to DenverExplore the most affordable United Airlines flight options available from Heathrow to Denver. Find the lowest fares with prices last updated on 5 May 2026.

Explore the most affordable United Airlines flight options available from Heathrow to Denver. Find the lowest fares with prices last updated on 5 May 2026.

Best United Airlines flights from Heathrow to DenverDiscover carefully curated United Airlines flight deals from Heathrow to Denver that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 May 2026.

Discover carefully curated United Airlines flight deals from Heathrow to Denver that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 May 2026.

Direct United Airlines flights from Heathrow to DenverExplore direct United Airlines flight options from Heathrow to Denver based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 May 2026.

Explore direct United Airlines flight options from Heathrow to Denver based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 May 2026.

Last-minute United Airlines flights from Heathrow to DenverDiscover last-minute United Airlines flight deals from Heathrow to Denver. Data last updated 5 May 2026 and is based on user searches.

Discover last-minute United Airlines flight deals from Heathrow to Denver. Data last updated 5 May 2026 and is based on user searches.

One-way United Airlines flights to DenverSearch for one-way United Airlines flight options to Denver. Find affordable one-way fares based on user searches. Data last updated 5 May 2026.

Search for one-way United Airlines flight options to Denver. Find affordable one-way fares based on user searches. Data last updated 5 May 2026.

When is the best time to book a flight to Denver with United Airlines?

Which month is the cheapest to fly Economy class from London Heathrow Airport to Denver?

Weekly United Airlines flight availability from London Heathrow Airport to Denver

Rainfall in Denver by month

Temperature in Denver by month

Best time to book a flight from Heathrow to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Heathrow with our price prediction graph.

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly from Heathrow to Denver on another airline

Consider alternative airlines that service the Denver area. Flight routes are based on user searches made on Cheapflights and were last updated on 5 May 2026.

Other United Airlines flights from Heathrow

Browse through other United Airlines flights departing from Heathrow. Flight routes are based on user searches made on Cheapflights and were last updated on 5 May 2026.

Complete your trip

Complete your trip to Denver by adding a car hire and/or hotel booking to your travel itinerary.

Other airlines servicing Heathrow and Denver

Choose from other airlines serving Heathrow and Denver.

Other popular destinations in North America

If Denver is not for you, choose from these other destinations located in North America. Flight routes are based on user searches made on Cheapflights and were last updated on 5 May 2026.

Popular flights with United Airlines

Browse through some of the most popular routes that United Airlines offers at this time. Flights are based on user searches made on Cheapflights and were last updated on 5 May 2026.

See what others are saying about United Airlines

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Cheapest United Airlines flights from Heathrow to Denver
Explore the most affordable United Airlines flight options available from Heathrow to Denver. Find the lowest fares with prices last updated on 5 May 2026.

Best United Airlines flights from Heathrow to Denver
Discover carefully curated United Airlines flight deals from Heathrow to Denver that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 May 2026.

Direct United Airlines flights from Heathrow to Denver
Explore direct United Airlines flight options from Heathrow to Denver based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 May 2026.

Last-minute United Airlines flights from Heathrow to Denver
Discover last-minute United Airlines flight deals from Heathrow to Denver. Data last updated 5 May 2026 and is based on user searches.

One-way United Airlines flights to Denver
Search for one-way United Airlines flight options to Denver. Find affordable one-way fares based on user searches. Data last updated 5 May 2026.