Cheap flights from Ottawa to London from C$ 394

The month of September is, on average, the cheapest month to fly to London Heathrow Airport from Ottawa, with most prices found around C$ 978. If you aren’t able to travel to London Heathrow Airport during the month of September, then flying in January is also cheap. Prices for this month can be found on momondo for an average of C$ 985.

According to our data, Wednesday is the cheapest day to fly to London Heathrow Airport from Ottawa. The lowest ticket price found for a Wednesday departure recently was C$ 1,138. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Ottawa to London Heathrow Airport for around C$ 1,203.

Our data shows that the cheapest Ottawa to London Heathrow Airport flights are usually those with departure times in the evening. Our users have found flights to London Heathrow Airport in the evening for as low as C$ 1,145. In the morning is when there is more demand to fly to London Heathrow Airport, so prices are often more expensive at around C$ 1,618 per ticket.

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 C$ 1,124 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 C$ 1,009 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 89% on your flight if you consider stops on a Ottawa to London Heathrow Airport flight.

As of September 2026, prices for Ottawa to London Heathrow Airport flights are approximately 20% cheaper when compared to flights at the same time last year.

WestJet and Aer Lingus 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 64% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 8 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 30% 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 135 minutes.

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

Saturday 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 has had the least delays on this route over the last 12 months, with about 30% of their flights experiencing any sort of delay.

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

Flights via Paris (CDG) offer the lowest average round-trip price of C$ 939.

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 31m.

As of September 2026, there are 3 flights per day flying from Ottawa to London Heathrow Airport. The most common time of day flights depart is 9:00p.m., with 100% of flights taking off in the evening.

The number of flights available between Ottawa and London Heathrow Airport is 21 per week as of September 2026. The most frequent departure day is Sat, with 33% of weekly flights leaving on this day.