Cheap flights from Colorado to London from £248

In general, January is the cheapest month to fly from Colorado to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £75. The month of September is another great option to travel to London Heathrow Airport, with average flight prices from Colorado averaging around £327.

On average, the least expensive day to fly to London Heathrow Airport from Colorado is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £520. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Monday is £790.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from Colorado to London Heathrow Airport in the evening for as low as £521. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £673 on average. Flights to London Heathrow Airport from Colorado in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Denver Intl to London Heathrow for the best Colorado - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Colorado when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £607 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Colorado for as low as £522 on momondo.

United Airlines, JetBlue, and Lufthansa are the most popular carriers operating from Colorado to London Heathrow

United Airlines, British Airways and Lufthansa are the top three most popular airlines that fly to London Heathrow Airport from Colorado according to our data. United Airlines is the first choice among our users, with 46% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 3 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

As of May 2026, there are 17 flights per day flying from Colorado to London Heathrow Airport. The most common time of day flights depart is 17:00, with 60% of flights taking off in the evening.

As of May 2026, 119 flights take off from Colorado and land in London Heathrow Airport each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.