Cheap flights from Dallas to London from £248

In general, September is the cheapest month to fly from Dallas to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £550. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Dallas averaging around £580.

On average, the least expensive day to fly to London Heathrow Airport from Dallas is on a Monday. momondo users have found tickets for Monday departures for as low as £601. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Thursday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Thursday is £833.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Dallas to London Heathrow Airport in the afternoon for as low as £662. 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 evening when prices are £676 on average. Flights to London Heathrow Airport from Dallas in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Dallas/Fort Worth to London Heathrow for the best Dallas - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Dallas when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £699 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 Dallas for as low as £597 on momondo.

There are 3 cabin classes available to choose from on Dallas to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

KLM, Delta, and Virgin Atlantic are the most popular carriers operating from Dallas to London Heathrow

British Airways, Iberia and Finnair are the top three most popular airlines that fly to London Heathrow Airport from Dallas according to our data. British Airways is the first choice among our users, with 50% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 4 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 24% of flights between Dallas and London have experienced a delay on any given week. The average delay length over the past 12 months has been 163 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights departing at night have, in the past, seen delays more frequently in comparison.

Monday is statistically the day of the week that experiences the fewest delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

According to our data, American Airlines have had the fewest delays on this route over the last 12 months, with about 22% of their flights experiencing any sort of delay.

As of February 2026, there are 25 flights per day flying from Dallas to London Heathrow Airport. The most common time of day flights depart is 20:00, with 58% of flights taking off in the evening.

As of February 2026, 179 flights take off from Dallas and land in London Heathrow Airport each week. The most common flight departure day for this route is Thu, with 16% of weekly flights taking off on this day.