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

LHR — DEN
16 Oct — 23 Oct1
1 adult
1 adult, Economy

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 2025

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 16 September 2025.

One-way from

£478

Return from

£433

Popular in

July

Cheapest in

March

Average price (all airlines)

£488
United Airlines
  • United Airlines
  • 21/9
  • Nonstop
  • 9h 45m total
  • London to Denver
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United Airlines
  • United Airlines
  • 27/9-29/9
  • 2 total stops
  • 43h 18m total
  • London to Denver
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Highest demand for flights from London Heathrow to Denver Intl; 14% 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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  • Can I get a flight from London Heathrow Airport to Denver on United Airlines for under £700?

    Cheapflights users have found 1 United Airlines flights for under £700 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 do most travelers feel about United Airlines?

    544 Cheapflights users have left reviews for United Airlines and have rated the airline 7.0/10. 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!

Find United Airlines flight deals from Heathrow to Denver

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 16 September 2025.

Sat 27/913:05LHR - DEN
1 stop26h 23mUnited Airlines
Mon 29/907:45DEN - LHR
1 stop16h 55mUnited Airlines
Deal found 15/9£433
Thu 2/1011:25LHR - DEN
Nonstop9h 45mUnited Airlines
Sun 12/1016:19DEN - LHR
1 stop14h 01mUnited Airlines
Deal found 15/9£435
Thu 25/906:55LHR - DEN
1 stop13h 50mUnited Airlines
Wed 1/1017:35DEN - LHR
Nonstop9h 05mUnited Airlines
Deal found 14/9£440

Travel insights for United Airlines flights from Heathrow to Denver

Get recent, data-driven insights about United Airlines flights from Heathrow to Denver including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a return flight from Heathrow to Denver. Price data was last updated on 12 September 2025.

Booking with United Airlines 45 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 November, with an average price of £397. Conversely, traveling with United Airlines from London Heathrow Airport to Denver in December will be the most expensive, with an average cost of £542. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

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.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Browse thousands of different options on Cheapflights for your next trip

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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 16 September 2025.
Lufthansa flights from London Heathrow to Denver Intl
British Airways flights from London Heathrow to Denver Intl

See what others are saying about United Airlines

Read reviews and see what other travellers are saying about their experiences with United Airlines. Get insights from real passengers regarding the airline's services, customer satisfaction, and overall travel experience. Use these reviews to inform your decision when choosing United Airlines for your next flight. Reviews last updated 16 September 2025.
United Airlines
7.4
Good
8,929 reviews
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Overview

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

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