Cheap flights from Washington, D.C., United States to Ontario, United States

Travelers frequently search for route combinations, such as Washington, D.C. and Denver, Las Vegas, Orlando, San Francisco, Los Angeles, Austin, Phoenix, Atlanta, Fort Lauderdale, London, Salt Lake City, Chicago, San Diego, New Orleans, Houston, San Salvador, Paris, Dallas, Barcelona, Tampa.

Travelers frequently search for route combinations, such as Ontario and Denver, Orlando, Austin, Atlanta, Sacramento, Seattle, San Francisco, San Jose, San Antonio, Raleigh, Phoenix, Charlotte, Portland, Detroit, Philadelphia, Las Vegas, Oakland, Nashville, Chicago, Fort Lauderdale.

Washington, D.C. is mainly served by Baltimore–Washington International. But there are other airports nearby, including Washington Dulles International, Ronald Reagan Washington National.

The main airport in Washington, D.C. is Baltimore–Washington International. It is also served by Philadelphia International, Norfolk International, Richmond International, Lehigh Valley International, Trenton–Mercer, Atlantic City International, Harrisburg International, Altoona–Blair County, Shenandoah Valley Regional, Lancaster.

The main airport in Ontario is Ontario International. It is also served by Tijuana International, San Diego International, Ontario International, John Wayne, Hollywood Burbank, Palm Springs International, Imperial County, Santa Barbara Municipal, Long Beach, Meadows Field.

Yes, it's possible to combine different modes of transport between Washington, D.C. and Ontario thanks to our Virtual Interlining technology. Making use of not only flights but also trains and buses between Washington, D.C. and Ontario can give rise to new adventures. Read more about how Virtual Interlining works on Kiwi.com Stories.

Virtual Interlining provides a revolutionary way of traveling. You can combine different modes of transport like flights, trains, and buses into one itinerary. And this often saves money. Thanks to the world's largest carrier database, the Kiwi.com search function enables anyone to mix and match different modes of transport easily.

Currently, you can fly between Washington, D.C. and Ontario with Frontier Airlines, Spirit Airlines, United Airlines, Alaska Airlines, Sun Country Airlines.

If you don’t have specific dates for your trip between Washington, D.C. and Ontario, you can enter a date range into the departure and return fields. Most carriers on the Kiwi.com website allow you to search and book up to six months from the day of your search. Order the search results by the best, cheapest, or fastest route, or find the cheapest outbound and return combination in the pricing table.