Cheap flights from Ottawa to London from C$ 343

In general, September is the cheapest month to fly from Ottawa to London. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 876. If you aren’t able to travel to London during the month of September, then flying in February is also cheap. Prices for this month can be found on momondo for an average of C$ 922.

According to our data, Tuesday is the cheapest day to fly to London from Ottawa. The lowest ticket price found for a Tuesday departure recently was C$ 967. 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 for around C$ 1,189.

Our most recent data shows that the best time of day to fly to London is in the evening. Flights from Ottawa to London during this time can be as low as C$ 1,043. In the morning is when there is more demand to fly to London, so prices are often more expensive at around C$ 1,616 per ticket.

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

You are more likely to see cheaper flights to London from Ottawa when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around C$ 1,121 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Ottawa for as low as C$ 1,007 on momondo.

There are 3 cabin classes available to choose from on Ottawa to London 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 84% on your flight if you consider stops on a Ottawa to London flight.

As of September 2026, prices for Ottawa to London flights are approximately 43% cheaper when compared to flights at the same time last year.

Air Transat, WestJet, and Porter Airlines are the most popular carriers operating from Ottawa to London

Air Canada, British Airways and Lufthansa are the top three most popular airlines that fly to London from Ottawa according to our data. Air Canada is the first choice among our users, with 59% of people opting to fly with this airline when travelling to London. Keep in mind that there are 10 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

Historically, on average around 27% 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 131 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.

Tuesday 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 Transat has had the least delays on this route over the last 12 months, with about 20% of their flights experiencing any sort of delay.

Toronto (YYZ) was the most common stop: 83% of momondo users choosing one-stop flights on this route connected there.

Flights via Toronto (YYZ) offer the lowest average round-trip price of C$ 965.

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

Paris (CDG) has the shortest average layover time for this route: 1h 28m.

As of September 2026, 3 flights take off from Ottawa and land in London each day. The most common flight departure time for this route is 9:00p.m., with 100% of daily flights taking off in the evening.

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