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216 € Cheap Flights from Baltimore Washington International to Ontario International

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      Travellers and cabin class, 1 Adult, Economy

      Compare Baltimore Washington International 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 Baltimore Washington International to Ontario International

      Looking for a cheap last-minute deal or the best return flight from Baltimore Washington International Airport to Ontario International Airport? If you want to travel next month, return fares start from 216 €. Find the lowest prices on one-way and return tickets right here.
      Ontario.216 € per passenger.Departing Thu, 1 Oct, returning Mon, 5 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Thu, 1 Oct, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 5 Oct, arriving in Baltimore Washington International.Price includes taxes and charges.From 216 €, select.
      Ontario.217 € per passenger.Departing Thu, 24 Sep, returning Wed, 30 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Thu, 24 Sep, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 30 Sep, arriving in Baltimore Washington International.Price includes taxes and charges.From 217 €, select.
      Ontario.217 € per passenger.Departing Wed, 30 Sep, returning Thu, 5 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Wed, 30 Sep, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 5 Nov, arriving in Baltimore Washington International.Price includes taxes and charges.From 217 €, select.
      Ontario.217 € per passenger.Departing Sat, 26 Sep, returning Mon, 5 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Sat, 26 Sep, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 5 Oct, arriving in Baltimore Washington International.Price includes taxes and charges.From 217 €, select.
      Ontario.217 € per passenger.Departing Thu, 5 Nov, returning Mon, 9 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Thu, 5 Nov, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 9 Nov, arriving in Baltimore Washington International.Price includes taxes and charges.From 217 €, select.
      Ontario.224 € per passenger.Departing Sat, 31 Oct, returning Tue, 3 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Sat, 31 Oct, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 3 Nov, arriving in Baltimore Washington International.Price includes taxes and charges.From 224 €, select.
      Ontario.321 € per passenger.Departing Tue, 8 Dec, returning Tue, 15 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Baltimore Washington International on Tue, 8 Dec, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 15 Dec, arriving in Baltimore Washington International.Price includes taxes and charges.From 321 €, select.
      Ontario.328 € per passenger.Departing Thu, 18 Feb, returning Tue, 23 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Thu, 18 Feb, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 23 Feb, arriving in Baltimore Washington International.Price includes taxes and charges.From 328 €, select.
      Ontario.331 € per passenger.Departing Sat, 23 Jan, returning Tue, 9 Feb.Return flight with Delta.Outbound indirect flight with Delta, departs from Baltimore Washington International on Sat, 23 Jan, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Tue, 9 Feb, arriving in Baltimore Washington International.Price includes taxes and charges.From 331 €, select.
      Ontario.331 € per passenger.Departing Tue, 15 Dec, returning Tue, 5 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Tue, 15 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 5 Jan, arriving in Baltimore Washington International.Price includes taxes and charges.From 331 €, select.
      Ontario.331 € per passenger.Departing Thu, 19 Nov, returning Tue, 1 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Thu, 19 Nov, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 1 Dec, arriving in Baltimore Washington International.Price includes taxes and charges.From 331 €, select.
      Ontario.331 € per passenger.Departing Wed, 17 Feb, returning Wed, 3 Mar.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Wed, 17 Feb, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 3 Mar, arriving in Baltimore Washington International.Price includes taxes and charges.From 331 €, select.
      Ontario.331 € per passenger.Departing Sat, 9 Jan, returning Wed, 13 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Sat, 9 Jan, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 13 Jan, arriving in Baltimore Washington International.Price includes taxes and charges.From 331 €, select.
      Ontario.333 € per passenger.Departing Thu, 4 Mar, returning Tue, 9 Mar.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Thu, 4 Mar, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 9 Mar, arriving in Baltimore Washington International.Price includes taxes and charges.From 333 €, select.
      Ontario.424 € per passenger.Departing Sun, 1 Nov, returning Mon, 1 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Sun, 1 Nov, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 1 Feb, arriving in Baltimore Washington International.Price includes taxes and charges.From 424 €, select.
      Ontario.449 € per passenger.Departing Wed, 4 Nov, returning Mon, 4 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Baltimore Washington International on Wed, 4 Nov, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 4 Jan, arriving in Baltimore Washington International.Price includes taxes and charges.From 449 €, select.

      Find the cheapest month to fly from Baltimore Washington International to Ontario International

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Baltimore Washington International to Ontario International flights are currently cheapest in October.
      Sep
      from 217 €
      Oct
      from 216 €
      Nov
      from 217 €
      Dec
      from 321 €
      Jan
      from 331 €
      Feb
      from 328 €
      Mar
      from 333 €
      Apr
      from 504 €
      May
      from 503 €
      Jun
      from 507 €
      Jul
      Find prices
      Aug
      Find prices

      Baltimore Washington International to Ontario International: Alternative routes

      Compare routes from Baltimore Washington International 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 216 €
      Search flights

      San Bernardino Norton AFB

      39km from central Ontario
      from 444 €
      Search flights

      Santa Ana John Wayne

      48km from central Ontario
      from 236 €
      Search flights

      Long Beach Municipal

      54km from central Ontario
      from 260 €
      Search flights

      Hawthorne

      65km from central Ontario
      Search flights

      Burbank

      67km from central Ontario
      from 276 €
      Search flights

      Los Angeles International

      71km from central Ontario
      Cheapest
      from 201 €
      Search flights

      Washington D.C. to Ontario: Flight information

      The things to know before you go.
      Cheapest flight found216 €
      Cheapest month to flyOctober

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

      The best price we found for a return flight from Baltimore Washington International to Ontario International is 216 €. 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 Baltimore Washington International to Ontario International. But we found flights with one or more stops from 216 €.
      As of September 2026, there are no flights flying from Baltimore Washington International to Ontario International.
      The cheapest month to fly from Baltimore Washington International to Ontario International is usually October.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Baltimore Washington International Airport to Ontario International Airport on Thursday, 1 October 2026.
      No airlines currently offer direct flights between Baltimore Washington International 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 Baltimore Washington International Airport (BWI) to Ontario International Airport (ONT): what you need to know

      • The average time for a direct flight from Baltimore Washington International Airport to Ontario International Airport is 5 hours 25 minutes.

      • The timezone in Ontario is UTC-8, which is three hours behind Washington DC.

      • Give yourself plenty of time to make your BWI to ONT flight. As a general rule, turn up at least two hours before international departures and an hour ahead for domestic flights.

      • During popular months like July, you'll want to get to the airport earlier. Plan to arrive two hours before a domestic departure and four hours ahead for international flights when you travel during a peak period in general.

      • Getting to Ontario (and then seeing more of the United States!) is a breeze with Southwest Airlines. This popular carrier offers direct flights from Baltimore Washington International Airport to Ontario International Airport.

      • Southwest Airlines is the airline with the highest passenger demand for this route.

      • Among carriers operating BWI to ONT flights, Southwest Airlines has the best track record for timely arrivals.

      • We make it easy to book a flight with a stopover. To see all your options for tickets from Baltimore Washington International Airport to Ontario International Airport, deselect 'Direct flights only.' Then, choose a flight that has a stop long enough to tour the city of your choice. Worthwhile stopovers between BWI and ONT include:

        • Denver International Airport

        • Phoenix Sky Harbour Airport

        • Harry Reid International Airport

      How to find the cheapest flights from Baltimore Washington International Airport (BWI) to Ontario International Airport (ONT)

      • Right now, 108 € is the lowest price we've seen for a one-way Baltimore Washington International Airport to Ontario International Airport flight. The best price for a return ticket is 216 €. Bear in mind that fares can change due to availability at the time of booking.

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

      • The cheapest month for flights from Baltimore Washington International Airport to Ontario International Airport is May. Use the 'Whole month' tool to see the lowest airfares if you have flexible travel dates.

      • There's no need to check every day to find out if fares have gone down when you set up a Price Alert. We'll let you know the moment there's a change in price on cheap flights from BWI to ONT.

      • Tailor your flights using filters. Pick your preferred arrival and departure times, total journey duration and airlines. You can also sort results by 'Best,' 'Fastest' or 'Cheapest' flights from Baltimore Washington International Airport to Ontario International Airport.

      Handy information about Baltimore Washington International Airport (BWI)

      • When it comes to the on-time performance of Baltimore Washington International Airport, 77% of flights arrive within the expected timeframe.

      • Baltimore Washington International Airport is about 48 kilometres from central Washington DC. If you're driving, ride-sharing or catching a taxi from the centre, it'll take you 40 minutes or so to get there, depending on the traffic.

      • You can expect a journey time of about 50 minutes when using public transport.

      • Booked an early flight from Baltimore Washington International Airport to Ontario International Airport? Avoid the stress of rushing to the airport (and get some extra shut-eye) by picking one of these hotels near BWI:

      Arriving at Ontario International Airport (ONT)

      When to fly to Ontario International Airport (ONT)

      • July is the busiest month for flights from Baltimore Washington International Airport to Ontario International Airport. To avoid the crowds, visit Ontario in March.

      • Before locking in your flight from Baltimore Washington International Airport to Ontario International Airport, think about the type of weather you like. August is the warmest month in Ontario, with temperatures ranging from 16ºC (61ºF) to 36ºC (97ºF).

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

      Explore more of the United States

      • Los Angeles is just one of the many cities in the United States waiting to be explored after you've seen Ontario. Around 56 kilometres away to the west, popular attractions include Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

      • If you're ready to explore another side of the United States, consider San Diego, about 153 kilometres south of Ontario. San Diego Zoo, San Diego Balboa Park and USS Midway Museum are key reasons to visit.

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