Cheap flights from London to Ottawa from £165

In general, May is the cheapest month to fly from London to Ottawa. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £478. If you aren’t able to travel during the month of May, then book flights to Ottawa from London during June instead. Flights to Ottawa in June, while not as cheap as those in May, still average around £483.

The cheapest day to depart on your flight to Ottawa is on a Friday when prices can be found for as low as £529. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around £595. These prices are subject to change though, so be sure to set up a Price Alert for flights to Ottawa.

Flying to Ottawa from London in the morning is the least expensive time of day to depart. momondo users have found prices as low as £557 when looking at flights departing in the morning. At midday is when there is more demand to fly to Ottawa, so prices are often more expensive at around £566 per ticket.

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

You are more likely to see cheaper flights to Ottawa from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Ottawa for around £551 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ottawa from London for as low as £372 on momondo.

There are 3 cabin classes available to choose from on London to Ottawa flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

KLM, Air Europa, and Aer Lingus are the most popular carriers operating from London to Ottawa

Air Canada, Lufthansa and British Airways are the top three most popular airlines that fly to Ottawa from London according to our data. Air Canada is the first choice among our users, with 73% of people opting to fly with this airline when travelling to Ottawa. Keep in mind that there are 8 different airlines that fly to Ottawa on a routine basis, so you have a few additional options to choose from.

Historically, on average around 10% of flights between London and Ottawa have experienced a delay on any given week. The average delay length over the past 12 months has been 236 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Thursday is statistically the day of the week that experiences the fewest delays on this flight route. Friday 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 10% of their flights experiencing any sort of delay.

Paris (CDG) was the most common stop: 58% of momondo users choosing one-stop flights on this route connected there.

Flights via Toronto (YYZ) offer the lowest average return price of £426.

Flights connecting via Montreal (YUL) have the shortest average one-way travel time: 9h 57m.

Newark (EWR) has the shortest average stopover time for this route: 1h 31m.

The number of flights available between London and Ottawa is 2 per day as of February 2026. The most frequent departure time is 12:00, with 100% of daily flights leaving in the afternoon.

The number of flights available between London and Ottawa is 18 per week as of February 2026. The most frequent departure day is Wed, with 33% of weekly flights leaving on this day.