Cheap flights from Calgary to London from C$ 240

The month of January is, on average, the cheapest month to fly to London Heathrow Airport from Calgary, with most prices found around C$ 742. If you aren’t able to travel to London Heathrow Airport during the month of January, then flying in November is also cheap. Prices for this month can be found on momondo for an average of C$ 752.

According to our data, Sunday is the cheapest day to fly to London Heathrow Airport from Calgary. The lowest ticket price found for a Sunday departure recently was C$ 1,144. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Calgary to London Heathrow Airport for around C$ 1,234.

Our data shows that the cheapest Calgary to London Heathrow Airport flights are usually those with departure times in the evening. Our users have found flights to London Heathrow Airport in the evening for as low as C$ 1,132. In the afternoon is when there is more demand to fly to London Heathrow Airport, so prices are often more expensive at around C$ 1,597 per ticket.

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 C$ 1,072 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 C$ 997 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.

United Airlines and TAP AIR PORTUGAL are the most popular carriers 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 53% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 6 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 129 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the early afternoon 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 has had the least delays on this route over the last 12 months, with about 16% of their flights experiencing any sort of delay.

Dallas (DFW) was the most common stop: 56% of momondo users choosing one-stop flights on this route connected there.

Flights via Montreal (YUL) offer the lowest average round-trip price of C$ 721.

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 13h 10m.

Denver (DEN) has the shortest average layover time for this route: 1h 43m.

12 flights are operational daily from Calgary to London Heathrow Airport as of March 2026. The most popular departure time for this route is 6:00p.m., with 100% of flights per day taking off in the evening.

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