Cheap flights from Montreal to London from $259

The month of November is, on average, the cheapest month to fly to London Heathrow Airport from Montreal, with most prices found around $637. If you’re not able to fly to London Heathrow Airport in November, then October is your next best option. Flight prices from Montreal to London Heathrow Airport during October average around $667.

Our data shows that Saturday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $799. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $895.

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 $762. 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 $873.

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 $726 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 $663 on momondo.

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

You could potentially save up to 51% on your flight if you consider stops on a Montreal to London Heathrow Airport flight.

As of February 2026, prices for Montreal to London Heathrow Airport flights are approximately 53% more expensive when compared to flights at the same time last year.

TAP AIR PORTUGAL is the most popular carrier operating from Montreal to London Heathrow

Air Canada, Lufthansa and British Airways are the top three most popular airlines that fly to London Heathrow Airport from Montreal according to our data. Air Canada is the first choice among our users, with 51% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 4 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 23% 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 164 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.

Wednesday 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, Air Canada have had the least number of delays on this route over the last 12 months; with about 23% of their flights experiencing any sort of delay.

As of February 2026, 10 flights take off from Montreal and land in London Heathrow Airport each day. The most common flight departure time for this route is 7:00PM, with 100% of daily flights taking off in the evening.

The number of flights available between Montreal and London Heathrow Airport is 76 per week as of February 2026. The most frequent departure day is Sun, with 18% of weekly flights leaving on this day.