Cheap flights from Montreal to London from £253

In general, July is the cheapest month to fly from Montreal to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £100. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Montreal averaging around £243.

On average, the least expensive day to fly to London Heathrow Airport from Montreal is on a Sunday. momondo users have found tickets for Sunday departures for as low as £468. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £703.

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 Montreal to London Heathrow Airport in the afternoon for as low as £542. 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 £569 on average. Flights to London Heathrow Airport from Montreal in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Montreal Pierre Elliott Trudeau Intl to London Heathrow for the best Montreal - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Montreal when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £549 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 Montreal for as low as £508 on momondo.

You could potentially save up to 44% on your flight if you consider stops on a Montreal to London Heathrow Airport flight.

Historically, on average around 22% of flights between Montreal and London have experienced a delay on any given week. The average delay length over the past 12 months has been 159 minutes.

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

Thursday is statistically the day of the week that experiences the fewest delays on this flight route. Tuesday 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 21% of their flights experiencing any sort of delay.

The number of flights available between Montreal and London Heathrow Airport is 16 per day as of May 2026. The most frequent departure time is 22:00, with 100% of daily flights leaving in the evening.

As of May 2026, 114 flights take off from Montreal and land in London Heathrow Airport each week. The most common flight departure day for this route is Tue, with 16% of weekly flights taking off on this day.