Cheap flights from London Heathrow Airport to Montreal from $671

The cheapest month to fly to Montreal from London Heathrow Airport is in September. Flight prices, which tend to average around $840, are often lower during this time because this is during the off-season. If you are unable to visit Montreal during the month of September, then departing from London Heathrow Airport during the month October is also very affordable. Most momondo users find prices during this month for around $842.

The cheapest day to depart from London Heathrow Airport to Montreal is on a Sunday. Travellers who choose to depart for Montreal on a Sunday will often find tickets for as low as $626. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to Montreal for around $1,187.

Our data shows that the cheapest London Heathrow Airport to Montreal flights are usually those with departure times in the afternoon. Our users have found flights to Montreal in the afternoon for as low as $736. Try not to purchase tickets at midday because they tend to be around $1,187. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to Montreal from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Montreal for around $984 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Montreal from London Heathrow Airport for as low as $935 on momondo.

There is only 1 cabin class available to choose from on London Heathrow to Montreal flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Historically, on average around 9% of flights between London and Montreal have experienced a delay on any given week. The average delay length over the past 12 months has been 158 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.

Wednesday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday 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 6% of their flights experiencing any sort of delay.

The number of flights available between London Heathrow Airport and Montreal is 14 per day as of April 2026. The most frequent departure time is 14:00, with 49% of daily flights leaving in the afternoon.

As of April 2026, 101 flights take off from London Heathrow Airport and land in Montreal each week. The most common flight departure day for this route is Fri, with 17% of weekly flights taking off on this day.