Cheap flights from Ottawa to London from $370

The month of September is, on average, the cheapest month to fly to London Heathrow Airport from Ottawa, with most prices found around $702. If you’re not able to fly to London Heathrow Airport in September, then January is your next best option. Flight prices from Ottawa to London Heathrow Airport during January average around $714.

Our data shows that Thursday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $864. The most expensive day to fly to London Heathrow Airport is Sunday, with ticket prices averaging around $1,161.

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 Ottawa to London Heathrow Airport in the afternoon for as low as $879. 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 morning are often more expensive with an average ticket price of $1,286.

Fly from Ottawa to London Heathrow for the best Ottawa - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Ottawa when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $819 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 Ottawa for as low as $740 on momondo.

There are 3 cabin classes available to choose from on Ottawa to London Heathrow Airport 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 58% on your flight if you consider stops on a Ottawa to London Heathrow Airport flight.

As of October 2026, prices for Ottawa to London Heathrow Airport flights are approximately 111% more expensive when compared to flights at the same time last year.

WestJet, Aer Lingus, and British Airways are the most popular carriers operating from Ottawa to London Heathrow

Air Canada, British Airways and Lufthansa are the top three most popular airlines that fly to London Heathrow Airport from Ottawa according to our data. Air Canada is the first choice among our users, with 58% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 5 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 32% of flights between Ottawa and London have experienced a delay on any given week. The average delay length over the past 12 months has been 141 minutes.

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

Saturday is statistically the day of the week which experiences the fewest number of 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 least number of delays on this route over the last 12 months; with about 32% of their flights experiencing any sort of delay.

Montreal (YUL) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Flights via Montreal (YUL) offer the lowest average round-trip price of $645.

Flights connecting via Montreal (YUL) have the shortest average one-way travel time: 9h 30m.

Montreal (YUL) has the shortest average layover time for this route: 1h 30m.

As of October 2026, there are 1 flights per day flying from Ottawa to London Heathrow Airport. The most common time of day flights depart is 10:00PM, with 100% of flights taking off in the evening.

As of October 2026, there are 7 flights per week flying from Ottawa to London Heathrow Airport. The most common day of the week flights depart is Thu, with 100% of flights taking off on this day.