Cheap flights from Calgary to London from $350

The month of January is, on average, the cheapest month to fly to London Heathrow Airport from Calgary, with most prices found around $541. If you’re not able to fly to London Heathrow Airport in January, then November is your next best option. Flight prices from Calgary to London Heathrow Airport during November average around $550.

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $896. The most expensive day to fly to London Heathrow Airport is Sunday, with ticket prices averaging around $1,101.

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 $908. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive with an average ticket price of $1,325.

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 $775 when searching weeks out. 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 $755 on momondo.

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

WestJet 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 47% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 5 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 19% 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 125 minutes.

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

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

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

Dallas (DFW) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Flights via Dallas (DFW) offer the lowest average round-trip price of $809.

Flights connecting via Amsterdam (AMS) have the shortest average one-way travel time: 12h 18m.

Dallas (DFW) has the shortest average layover time for this route: 2h 21m.

The number of flights available between Calgary and London Heathrow Airport is 12 per day as of February 2026. The most frequent departure time is 6:00PM, with 100% of daily flights leaving in the evening.

The number of flights available between Calgary and London Heathrow Airport is 84 per week as of February 2026. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.