Cheap flights from Montreal to London from $346

The month of July is, on average, the cheapest month to fly to London Heathrow Airport from Montreal, with most prices found around $136. If you’re not able to fly to London Heathrow Airport in July, then April is your next best option. Flight prices from Montreal to London Heathrow Airport during April average around $329.

Our data shows that Sunday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $826. The most expensive day to fly to London Heathrow Airport is Thursday, with ticket prices averaging around $948.

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 $794. 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 evening are often more expensive with an average ticket price of $896.

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 $734 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 Montreal for as low as $692 on momondo.

You could potentially save up to 33% 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 in the evening have, in the past, seen delays more frequently in comparison.

Thursday is statistically the day of the week which experiences the fewest number of 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 least number of delays on this route over the last 12 months; with about 21% of their flights experiencing any sort of delay.

As of May 2026, 12 flights take off from Montreal and land in London Heathrow Airport each day. The most common flight departure time for this route is 10:00PM, with 100% of daily flights taking off in the evening.

The number of flights available between Montreal and London Heathrow Airport is 88 per week as of May 2026. The most frequent departure day is Wed, with 19% of weekly flights leaving on this day.