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Cheap Flights from Washington D.C. (DCA) to Ontario (ONT)

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      Travellers and cabin class, 1 Adult, Economy

      Compare Washington Ronald Reagan to Ontario International flight deals

      Find the cheapest month or even day of the year to fly to Ontario International

      Book the best Ontario International fare with no extra fees

      Flight deals from Washington Ronald Reagan to Ontario International

      Looking for a cheap last-minute deal or the best return flight from Washington Ronald Reagan Airport to Ontario International Airport? If you want to travel next month, return fares start from $349. Find the lowest prices on one-way and return tickets right here.
      Ontario.$335 per passenger.Departing Wed, 28 Oct, returning Tue, 3 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Wed, 28 Oct, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 3 Nov, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $335, select.
      Ontario.$349 per passenger.Departing Sat, 12 Sep, returning Sat, 19 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Sat, 12 Sep, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 19 Sep, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $349, select.
      Ontario.$349 per passenger.Departing Tue, 3 Nov, returning Tue, 10 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Tue, 3 Nov, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 10 Nov, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $349, select.
      Ontario.$349 per passenger.Departing Wed, 7 Oct, returning Wed, 14 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Wed, 7 Oct, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 14 Oct, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $349, select.
      Ontario.$351 per passenger.Departing Wed, 30 Sep, returning Mon, 5 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Wed, 30 Sep, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 5 Oct, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $351, select.
      Ontario.$485 per passenger.Departing Tue, 16 Feb, returning Tue, 23 Feb.Return flight with Delta.Outbound indirect flight with Delta, departs from Washington Ronald Reagan on Tue, 16 Feb, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Tue, 23 Feb, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $485, select.
      Ontario.$485 per passenger.Departing Wed, 9 Dec, returning Wed, 16 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Wed, 9 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 16 Dec, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $485, select.
      Ontario.$486 per passenger.Departing Tue, 15 Sep, returning Wed, 20 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Tue, 15 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 20 Jan, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $486, select.
      Ontario.$487 per passenger.Departing Thu, 7 Jan, returning Thu, 14 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Thu, 7 Jan, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 14 Jan, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $487, select.
      Ontario.$488 per passenger.Departing Thu, 26 Nov, returning Thu, 3 Dec.Return flight with United.Outbound indirect flight with United, departs from Washington Ronald Reagan on Thu, 26 Nov, arriving in Ontario International.Inbound indirect flight with United, departs from Ontario International on Thu, 3 Dec, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $488, select.
      Ontario.$494 per passenger.Departing Wed, 27 Jan, returning Thu, 11 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Wed, 27 Jan, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 11 Feb, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $494, select.
      Ontario.$552 per passenger.Departing Wed, 17 Mar, returning Wed, 24 Mar.Return flight with Delta.Outbound indirect flight with Delta, departs from Washington Ronald Reagan on Wed, 17 Mar, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Wed, 24 Mar, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $552, select.
      Ontario.$554 per passenger.Departing Tue, 15 Dec, returning Thu, 21 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Tue, 15 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 21 Jan, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $554, select.
      Ontario.$554 per passenger.Departing Sun, 6 Dec, returning Sat, 6 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Sun, 6 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 6 Feb, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $554, select.
      Ontario.$556 per passenger.Departing Wed, 24 Feb, returning Sat, 6 Mar.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Wed, 24 Feb, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 6 Mar, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $556, select.
      Ontario.$601 per passenger.Departing Mon, 21 Sep, returning Thu, 10 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Mon, 21 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 10 Dec, arriving in Washington Ronald Reagan.Price includes taxes and charges.From $601, select.

      Find the cheapest month to fly from Washington Ronald Reagan to Ontario International

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Ronald Reagan to Ontario International flights are currently cheapest in September.
      Aug
      from $1,080
      Sep
      from $349
      Oct
      from $349
      Nov
      from $349
      Dec
      from $485
      Jan
      from $487
      Feb
      from $485
      Mar
      from $552
      Apr
      from $625
      May
      Find prices
      Jun
      Find prices
      Jul
      Find prices

      Washington Ronald Reagan to Ontario International: Alternative routes

      Compare routes from Washington Ronald Reagan to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

      Ontario International

      4km from central Ontario
      Closest
      from $335
      Search flights

      San Bernardino Norton AFB

      39km from central Ontario
      Search flights

      Santa Ana John Wayne

      48km from central Ontario
      from $423
      Search flights

      Long Beach Municipal

      54km from central Ontario
      from $390
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      Hawthorne

      65km from central Ontario
      Search flights

      Burbank

      67km from central Ontario
      from $543
      Search flights

      Los Angeles International

      71km from central Ontario
      Cheapest
      from $247
      Search flights

      Washington D.C. to Ontario: Flight information

      The things to know before you go.
      Cheapest flight found$335
      Cheapest month to flyOctober

      Finding cheap flights from Washington Ronald Reagan to Ontario International: Frequently asked questions

      The best price we found for a return flight from Washington Ronald Reagan to Ontario International is $335. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
      Currently, there are no airlines that fly direct from Washington Ronald Reagan to Ontario International. But we found flights with one or more stops from $335.
      As of August 2026, there are no flights flying from Washington Ronald Reagan to Ontario International.
      The cheapest month to fly from Washington Ronald Reagan to Ontario International is usually October.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Ronald Reagan Airport to Ontario International Airport on Wednesday, 28 October 2026.
      No airlines currently offer direct flights between Washington Ronald Reagan Airport and Ontario International Airport. Most routes have one or more stops.
      We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

      We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.

      Currently, Frontier Airlines offers the cheapest flight tickets to Ontario International.

      Flying from Washington Ronald Reagan Airport (DCA) to Ontario International Airport (ONT): what you need to know

      • Ontario is three hours behind Washington DC and follows the UTC-8 timezone.

      • Your DCA to ONT flight won't wait if you're late, so don't forget to check in on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're flying internationally.

      • Be prepared for longer queues during popular months like August. Arriving up to four hours in advance for international flights and two hours for domestic departures is a good idea.

      • Think about adding a stopover when booking your ticket from Washington Ronald Reagan Airport to Ontario International Airport. Just uncheck 'Direct flights only' to break up your journey, or perhaps see a new city along the way. Here are some options between DCA and ONT:

        • Dallas Fort Worth International Airport

        • Harry Reid International Airport

        • Nashville Airport

      How to find the cheapest flights from Washington Ronald Reagan Airport (DCA) to Ontario International Airport (ONT)

      • Currently, $161 is the lowest price we've found for a one-way Washington Ronald Reagan Airport to Ontario International Airport flight. The best price for a return ticket is $335. Bear in mind that fares may change due to availability when booking.

      • It's usually smart to book as early as possible if you're looking for cheap tickets from DCA to ONT. That's because airlines change prices based on demand, which tends to rise closer to departure.

      • Finding cheap flights from Washington Ronald Reagan Airport to Ontario International Airport is more likely if you can be flexible with your dates. Use the 'Whole month' tool to see the lowest prices across each month and snap up a great deal.

      • Snapping up cheap flights from DCA to ONT is easy with Price Alerts. Simply create one of these automatic alerts and we'll notify you as soon as a new deal comes up.

      • Tailor your trip with filters. Select your departure and arrival times, total journey duration and airlines. You can also sort results by 'Best,' 'Cheapest' or 'Fastest' flights from Washington Ronald Reagan Airport to Ontario International Airport.

      Handy information about Washington Ronald Reagan Airport (DCA)

      • DCA is located at 1 Aviation Circle.

      • When it comes to Washington Ronald Reagan Airport's on-time performance, 71% of flights stick to their scheduled arrival time.

      • Washington Ronald Reagan Airport is about 6 kilometres from central Washington DC. If you're driving, ride-sharing or catching a taxi from the centre, it'll take 10 minutes or so to get there, depending on the traffic.

      • The journey when using public transport takes roughly 25 minutes.

      • Searching for a convenient hotel close to DCA? If you've booked an early flight from Washington Ronald Reagan Airport to Ontario International Airport, these accommodation options will have you sleeping moments from your departure lounge:

      Arriving at Ontario International Airport (ONT)

      Getting from Ontario International Airport (ONT) to central Ontario

      • You'll find ONT at 2900 E. Airport Drive.

      • Ontario International Airport is approximately 10 kilometres from the centre of Ontario. The drive time takes around 15 minutes.

      • Getting there on public transport takes about 45 minutes.

      When to fly to Ontario International Airport (ONT)

      • The quietest month for a flight from Washington Ronald Reagan Airport to Ontario International Airport is March, while July is the most popular. Pick the best time to visit Ontario based on whether you prefer a laid-back vibe or a more bustling atmosphere.

      • Lock in your flight from Washington Ronald Reagan Airport to Ontario International Airport for August if you want to explore Ontario during its warmest month. You can expect temperatures of between 16ºC (61ºF) and 36ºC (97ºF).

      • Look for cheap tickets from DCA to ONT in February if you like travelling in cooler conditions. Temperatures are at their lowest around then, ranging between 4ºC (39ºF) and 24ºC (75ºF) on average.

      Explore more of the United States

      • Ontario has loads to offer, but there are so many other parts of the United States waiting to be explored. About 56 kilometres west of Ontario, a visit to Los Angeles will keep you busy. Start with attractions like Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

      • If there's time to check out another great destination in the United States, head for San Diego, roughly 153 kilometres south of Ontario. San Diego Zoo, San Diego Balboa Park and USS Midway Museum are key highlights.

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      Plan the rest of your trip from Washington D.C. to Ontario

      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.