Cheap flights from Calgary to London from £243

In general, January is the cheapest month to fly from Calgary to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £400. The month of November is another great option to travel to London Heathrow Airport, with average flight prices from Calgary averaging around £406.

On average, the least expensive day to fly to London Heathrow Airport from Calgary is on a Saturday. momondo users have found tickets for Saturday departures for as low as £575. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Friday is £716.

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 Calgary to London Heathrow Airport in the evening for as low as £653. 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 £697 on average. Flights to London Heathrow Airport from Calgary in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Calgary to London Heathrow for the best Calgary - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Calgary when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £593 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 Calgary for as low as £524 on momondo.

United Airlines is the most popular carrier operating from Calgary to London Heathrow

WestJet, Air Canada and Lufthansa are the top three most popular airlines that fly to London Heathrow Airport from Calgary according to our data. WestJet is the first choice among our users, with 51% 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.

Historically, on average around 17% of flights between Calgary and London have experienced a delay on any given week. The average delay length over the past 12 months has been 132 minutes.

Generally, flights departing in the evening 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. Friday has historically seen more delays on average compared to the rest of the week.

According to our data, Air Canada have had the fewest delays on this route over the last 12 months, with about 14% of their flights experiencing any sort of delay.

The number of flights available between Calgary and London Heathrow Airport is 12 per day as of April 2026. The most frequent departure time is 19:00, with 100% of daily flights leaving in the evening.

As of April 2026, there are 86 flights per week flying from Calgary to London Heathrow Airport. The most common day of the week flights depart is Tue, with 15% of flights taking off on this day.