Cheap flights from Ottawa to London from $342

The month of November is, on average, the cheapest month to fly to London Heathrow Airport from Ottawa, with most prices found around $688. If you’re not able to fly to London Heathrow Airport in November, then January is your next best option. Flight prices from Ottawa to London Heathrow Airport during January average around $713.

Our data shows that Monday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $843. The most expensive day to fly to London Heathrow Airport is Sunday, with ticket prices averaging around $1,109.

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 $846. 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 $901.

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 $792 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 $730 on momondo.

You could potentially save up to 71% on your flight if you consider stops on a Ottawa to London Heathrow Airport flight.

As of May 2026, prices for Ottawa to London Heathrow Airport flights are approximately 7% more expensive when compared to flights at the same time last year.

Aer Lingus is the most popular carrier operating from Ottawa to London Heathrow

Air Canada, Lufthansa and British Airways 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 25% 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 143 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.

Monday 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 25% of their flights experiencing any sort of delay.

As of May 2026, there are 1 flights per day flying from Ottawa to London Heathrow Airport. The most common time of day flights depart is 9:00PM, with 100% of flights taking off in the evening.

As of May 2026, there are 11 flights per week flying from Ottawa to London Heathrow Airport. The most common day of the week flights depart is Sat, with 64% of flights taking off on this day.