Cheap flights from Washington, D.C. to Ontario from C$ 135

In general, June is the cheapest month to fly from Washington, D.C. to Region of Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 368. If you are unable to visit Region of Ontario during the month of June, then departing from Washington, D.C. during the month September is also very affordable. Most momondo users find prices during this month for around C$ 393.

The cheapest day to depart from Washington, D.C. to Region of Ontario is on a Sunday. Travellers who choose to depart for Region of Ontario on a Sunday will often find tickets for as low as C$ 362. The most expensive day to fly to Region of Ontario is Tuesday, with ticket prices averaging around C$ 454.

Our most recent data shows that the best time of day to fly to Region of Ontario is in the afternoon. Flights from Washington, D.C. to Region of Ontario during this time can be as low as C$ 388. If you have a flexible travel schedule, then try to avoid flying at noon when prices are C$ 540 on average. Flights to Region of Ontario from Washington, D.C. at noon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Washington, D.C. Reagan-National to Ottawa for the best Washington, D.C. - Ontario flight prices

You are more likely to see cheaper flights to Region of Ontario from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around C$ 509 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Ontario from Washington, D.C. for as low as C$ 367 on momondo.

There are 4 cabin classes available to choose from on Washington, D.C. to Region of Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Porter Airlines, Air Canada, and Delta are the most popular carriers operating from Washington, D.C. to Ontario

Air Canada, Porter Airlines and United Airlines are the top three most popular airlines that fly to Region of Ontario from Washington, D.C. according to our data. Air Canada is the first choice among our users, with 52% of people opting to fly with this airline when travelling to Region of Ontario. Keep in mind that there are 3 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

The number of flights available between Washington, D.C. and Region of Ontario is 65 per day as of June 2026. The most frequent departure time is 5:00p.m., with 46% of daily flights leaving in the afternoon.

As of June 2026, there are 457 flights per week flying from Washington, D.C. to Region of Ontario. The most common day of the week flights depart is Mon, with 16% of flights taking off on this day.