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Cheap Flights from Ontario International to Baltimore Washington International

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      Travellers and cabin class, 1 Adult, Economy

      Compare Ontario International to Baltimore Washington International flight deals

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

      Book the best Baltimore Washington International fare with no extra fees

      Flight deals from Ontario International to Baltimore Washington International

      Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Baltimore Washington International Airport? If you want to travel next month, return fares start from R 3,964. Find the lowest prices on one-way and return tickets right here.
      Washington D.C..R 2,121 per passenger.Departing Mon, 5 Oct.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 5 Oct, arriving in Baltimore Washington International.Price includes taxes and charges.From R 2,121, select.
      Washington D.C..R 2,124 per passenger.Departing Wed, 30 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 30 Sep, arriving in Baltimore Washington International.Price includes taxes and charges.From R 2,124, select.
      Washington D.C..R 2,291 per passenger.Departing Mon, 16 Nov.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 16 Nov, arriving in Baltimore Washington International.Price includes taxes and charges.From R 2,291, select.
      Washington D.C..R 2,942 per passenger.Departing Tue, 5 Jan.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 5 Jan, arriving in Baltimore Washington International.Price includes taxes and charges.From R 2,942, select.
      Washington D.C..R 2,942 per passenger.Departing Tue, 9 Feb.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 9 Feb, arriving in Baltimore Washington International.Price includes taxes and charges.From R 2,942, select.
      Washington D.C..R 2,946 per passenger.Departing Wed, 2 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 2 Dec, arriving in Baltimore Washington International.Price includes taxes and charges.From R 2,946, select.
      Washington D.C..R 3,183 per passenger.Departing Mon, 1 Mar.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 1 Mar, arriving in Baltimore Washington International.Price includes taxes and charges.From R 3,183, select.
      Washington D.C..R 4,631 per passenger.Departing Tue, 18 May.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 18 May, arriving in Baltimore Washington International.Price includes taxes and charges.From R 4,631, select.
      Washington D.C..R 4,656 per passenger.Departing Tue, 20 Apr.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 20 Apr, arriving in Baltimore Washington International.Price includes taxes and charges.From R 4,656, select.
      How did we find these deals? The deals you see here are the lowest prices for flight tickets from Ontario International to Baltimore Washington International found in the last 4 days, and are subject to change and availability.

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

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Baltimore Washington International flights are currently cheapest in October.
      Sep
      from R 2,124
      Oct
      from R 2,121
      Nov
      from R 2,291
      Dec
      from R 2,946
      Jan
      from R 2,942
      Feb
      from R 2,942
      Mar
      from R 3,183
      Apr
      from R 4,656
      May
      from R 4,631
      Jun
      Find prices
      Jul
      Find prices
      Aug
      Find prices

      Ontario International to Baltimore Washington International: Alternative routes

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

      Washington Ronald Reagan

      5km from central Washington D.C.
      ClosestCheapest
      from R 1,398
      Search flights

      Washington Dulles

      37km from central Washington D.C.
      from R 1,490
      Search flights

      Baltimore Washington International

      44km from central Washington D.C.
      from R 2,121
      Search flights

      Ontario to Washington D.C.: Flight information

      The things to know before you go.
      Cheapest flight foundR 2,121
      Cheapest month to flyOctober

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

      The best price we found for a return flight from Ontario International to Baltimore Washington International is R 3,964. 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 Ontario International to Baltimore Washington International. But we found flights with one or more stops from R 3,964.
      As of September 2026, there are no flights flying from Ontario International to Baltimore Washington International.
      The cheapest month to fly from Ontario International to Baltimore Washington International is usually October.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Baltimore Washington International Airport on Monday, 19 October 2026.
      No airlines currently offer direct flights between Ontario International Airport and Baltimore Washington 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 Baltimore Washington 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 Washington D.C. 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 Baltimore Washington International.

      Flying from Ontario International Airport (ONT) to Baltimore Washington International Airport (BWI): what you need to know

      • Take a direct flight from Ontario International Airport to Baltimore Washington International Airport and you'll be in the air for an average of 4 hours 45 minutes.

      • Washington DC's timezone is UTC-5, which makes Washington DC three hours ahead of Ontario.

      • To ensure you catch your ONT to BWI flight, allow plenty of time for things like baggage drop and finding your gate. Arriving two hours ahead of international departures and one hour before domestic flights is the standard rule.

      • During popular months like July, you'll want to get to the airport earlier than normal. Arrive two hours before a domestic departure and four hours ahead for an international flight whenever you're travelling during a peak period in general.

      • Southwest Airlines is your ticket to exploring Washington DC (and perhaps some other exciting parts of the United States!). Browse the direct flights from Ontario International Airport to Baltimore Washington International Airport offered by this popular carrier.

      • The majority of passengers choose to fly with Southwest Airlines on this route.

      • Southwest Airlines is the most punctual carrier that offers ONT to BWI flights, with 78.57% of its services arriving as planned.

      • Consider adding a stopover when booking your ticket from Ontario International Airport to Baltimore Washington International Airport. Simply uncheck 'Direct flights only' to break up your trip, or maybe even explore a new city along the way. Here are some options between ONT and BWI:

        • Atlanta Hartsfield-Jackson Airport

        • Denver International Airport

        • Harry Reid International Airport

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

      • Currently, R 2,121 is the lowest price we've seen for a one-way Ontario International Airport to Baltimore Washington International Airport flight. The best price for a return ticket is R 3,964. Remember that fares may change due to demand at the time of booking.

      • To find cheap tickets from ONT to BWI, book in advance. Airlines usually offer lower fares when flights are first released.

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

      • Landing cheap flights from ONT to BWI is easy with Price Alerts. All you need to do is create one of these automatic alerts and we'll notify you when a new discounted fare appears.

      • Select your ideal arrival and departure times, number of stops and airlines with the filters. Or sort your results by 'Cheapest' to get the best deals on flights from Ontario International Airport to Baltimore Washington International Airport.

      Handy information about Ontario International Airport (ONT)

      • ONT is located at 2900 E. Airport Drive.

      • 83% of flights departing from Ontario International Airport land at their destination as planned. With its impressive on-time stats, disruptions are unlikely when setting off from ONT.

      • Central Ontario to Ontario International Airport is approximately 10 kilometres. Depending on traffic, it'll take about 15 minutes to get there if you're driving, ride-sharing or catching a taxi.

      • The trip when using public transport takes roughly 45 minutes.

      • Get your journey off to a stress-free start by staying near ONT. Whether you're boarding an early flight from Ontario International Airport to Baltimore Washington International Airport or just don't like being rushed, these stays are perfect:

      Arriving at Baltimore Washington International Airport (BWI)

      When to fly to Baltimore Washington International Airport (BWI)

      • The quietest month for a flight from Ontario International Airport to Baltimore Washington International Airport is March, while July is the busiest. Pick the best time to go to Washington DC based on whether you prefer a more relaxed vibe or a faster pace.

      • The warmest month in Washington DC is July, with the temperature ranging between 19ºC (66ºF) and 33ºC (91ºF). Book your flights from Ontario International Airport to Baltimore Washington International Airport in this month if this is the type of weather you like.

      • If you like travelling in cooler conditions, look for a cheap ticket from ONT to BWI in January. Temperatures average between -6ºC (21ºF) and 10ºC (50ºF) then.

      Explore more of the United States

      • You've done Washington DC, now it's time to explore more of the United States. Travel around 322 kilometres north-east to New York to check off its leading sights. From Central Park to Statue of Liberty and Metropolitan Museum of Art, you'll have a full itinerary ahead.

      • Philadelphia is another well-known destination in the United States and is around 193 kilometres north-east of Washington DC. No trip is complete without experiencing Independence Hall, Liberty Bell and Philadelphia Museum of Art.

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