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Cheap Flights from Ontario International to Washington Dulles

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      Travellers and cabin class, 1 Adult, Economy

      Compare Ontario International to Washington Dulles flight deals

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

      Book the best Washington Dulles fare with no extra fees

      Flight deals from Ontario International to Washington Dulles

      Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Washington Dulles Airport? If you want to travel next month, return fares start from R 3,653. Find the lowest prices on one-way and return tickets right here.
      Washington D.C..R 1,492 per passenger.Departing Tue, 11 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 11 Aug, arriving in Washington Dulles.Price includes taxes and charges.From R 1,492, select.
      Washington D.C..R 1,953 per passenger.Departing Mon, 14 Sep.One-way flight with KLM.Outbound indirect flight with KLM, departs from Ontario International on Mon, 14 Sep, arriving in Washington Dulles.Price includes taxes and charges.From R 1,953, select.
      Washington D.C..R 2,014 per passenger.Departing Tue, 20 Oct.One-way flight with KLM.Outbound indirect flight with KLM, departs from Ontario International on Tue, 20 Oct, arriving in Washington Dulles.Price includes taxes and charges.From R 2,014, select.
      Washington D.C..R 2,098 per passenger.Departing Thu, 12 Nov.One-way flight with United.Outbound indirect flight with United, departs from Ontario International on Thu, 12 Nov, arriving in Washington Dulles.Price includes taxes and charges.From R 2,098, select.
      Washington D.C..R 2,782 per passenger.Departing Wed, 9 Dec.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Ontario International on Wed, 9 Dec, arriving in Washington Dulles.Price includes taxes and charges.From R 2,782, select.
      Washington D.C..R 2,919 per passenger.Departing Thu, 30 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 30 Jul, arriving in Washington Dulles.Price includes taxes and charges.From R 2,919, select.
      Washington D.C..R 6,633 per passenger.Departing Fri, 16 Apr.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Ontario International on Fri, 16 Apr, arriving in Washington Dulles.Price includes taxes and charges.From R 6,633, select.
      Washington D.C..R 10,740 per passenger.Departing Sat, 2 Jan.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Ontario International on Sat, 2 Jan, arriving in Washington Dulles.Price includes taxes and charges.From R 10,740, select.

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

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Washington Dulles flights are currently cheapest in August.
      Jul
      from R 2,919
      Aug
      from R 1,492
      Sep
      from R 1,953
      Oct
      from R 2,014
      Nov
      from R 2,098
      Dec
      from R 2,782
      Jan
      from R 10,740
      Feb
      Find prices
      Mar
      Find prices
      Apr
      from R 6,633
      May
      Find prices
      Jun
      Find prices

      Ontario International to Washington Dulles: 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 Washington Dulles.

      Washington Ronald Reagan

      5km from central Washington D.C.
      Closest
      from R 1,834
      Search flights

      Washington Dulles

      37km from central Washington D.C.
      Cheapest
      from R 1,492
      Search flights

      Baltimore Washington International

      44km from central Washington D.C.
      from R 1,978
      Search flights

      Ontario to Washington D.C.: Flight information

      The things to know before you go.
      Cheapest flight foundR 1,492
      Cheapest month to flyAugust

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

      The best price we found for a return flight from Ontario International to Washington Dulles is R 3,653. 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 Washington Dulles. But we found flights with one or more stops from R 3,653.
      As of July 2026, there are no flights flying from Ontario International to Washington Dulles.
      The cheapest month to fly from Ontario International to Washington Dulles is usually August.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Washington Dulles Airport on Tuesday, 11 August 2026.
      No airlines currently offer direct flights between Ontario International Airport and Washington Dulles 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 Washington Dulles 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 Washington Dulles.

      Flying from Ontario International Airport (ONT) to Washington Dulles Airport (IAD): what you need to know

      • The timezone in Washington DC is UTC-5, which is three hours ahead of Ontario.

      • Your ONT to IAD flight won't wait if you're running late, so be at the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're flying internationally.

      • During popular months such as July, it's best to get to the airport even earlier. Plan to arrive two hours before a domestic departure and four hours ahead of an international flight whenever you're travelling during a high season in general.

      • Think about adding a stopover when booking your ticket from Ontario International Airport to Washington Dulles Airport. Simply uncheck 'Direct flights only' to break up your trip, or visit a new city along the way. Here's where you can stop between ONT and IAD:

        • Denver International Airport

        • Charlotte Douglas Airport

        • Phoenix Sky Harbour Airport

      Handy information about Ontario International Airport (ONT)

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

      • Ontario International Airport maintains a solid on-time performance, so you're unlikely to face delays. Departures from ONT land at their destination as scheduled 83% of the time.

      • To get to Ontario International Airport from central Ontario, it'll take about 15 minutes by car. This depends on traffic though. It's approximately 10 kilometres from the airport to the city centre.

      • Taking public transport? Expect a trip time of around 45 minutes.

      • Get your holiday off to a leisurely start by staying near ONT. Whether you've booked an early flight from Ontario International Airport to Washington Dulles Airport or just don't want to be rushed, these hotels are the answer:

      Arriving at Washington Dulles Airport (IAD)

      Getting from Washington Dulles Airport (IAD) to central Washington DC

      • The address for IAD is 1 Saarinen Circle.

      • Washington Dulles Airport to the centre of Washington DC has a drive time of around 45 minutes. It's approximately 40 kilometres away.

      • It typically takes 1 hour 10 minutes if you're using public transport.

      When to fly to Washington Dulles Airport (IAD)

      • The quietest month for a flight from Ontario International Airport to Washington Dulles Airport is February, while July is the most popular. Choose the ideal time to visit Washington DC based on whether you prefer a laid-back vibe or a more bustling atmosphere.

      • Lock in your flight from Ontario International Airport to Washington Dulles Airport for July if you'd like to explore Washington DC during its warmest month. Expect temperatures of between 19ºC (66ºF) and 33ºC (91ºF).

      • January sees average temperatures of between -6ºC (21ºF) and 10ºC (50ºF). Search for cheap tickets from ONT to IAD sometime then if you like travelling in cooler conditions.

      Explore more of the United States

      • New York is just one of the many cities in the United States waiting to be explored once you've taken in the sights of Washington DC. Around 322 kilometres away to the north-east, check out popular attractions including Central Park, Statue of Liberty and Metropolitan Museum of Art.

      • If you're looking to explore another major destination in the United States, consider Philadelphia, about 193 kilometres north-east of Washington DC. Independence Hall, Liberty Bell and Philadelphia Museum of Art are among its highlights.

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

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