Cheap Flights from Washington Dulles to Ontario International

Compare Washington Dulles 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 Dulles to Ontario International

Looking for a cheap last-minute deal or the best return flight from Washington Dulles to Ontario International? Find the lowest prices on one-way and return tickets right here.

Ontario.Rs36,003 per passenger.Departing Sat, 9 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Sat, 9 Aug, arriving in Ontario International.Price includes taxes and charges.From Rs36,003, select.

Ontario.Rs37,598 per passenger.Departing Wed, 1 Oct.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Washington Dulles on Wed, 1 Oct, arriving in Ontario International.Price includes taxes and charges.From Rs37,598, select.

Ontario.Rs38,488 per passenger.Departing Wed, 7 Jan.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Dulles on Wed, 7 Jan, arriving in Ontario International.Price includes taxes and charges.From Rs38,488, select.

Ontario.Rs38,793 per passenger.Departing Thu, 11 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Thu, 11 Sep, arriving in Ontario International.Price includes taxes and charges.From Rs38,793, select.

Ontario.Rs39,235 per passenger.Departing Tue, 9 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Dulles on Tue, 9 Dec, arriving in Ontario International.Price includes taxes and charges.From Rs39,235, select.

Ontario.Rs39,381 per passenger.Departing Tue, 11 Nov.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Dulles on Tue, 11 Nov, arriving in Ontario International.Price includes taxes and charges.From Rs39,381, select.

Ontario.Rs56,075 per passenger.Departing Mon, 2 Feb.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Dulles on Mon, 2 Feb, arriving in Ontario International.Price includes taxes and charges.From Rs56,075, select.

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

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to Ontario International flights are currently cheapest in August.

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Washington Dulles to Ontario International: Alternative routes

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

Washington D.C. to Ontario: Flight information

The things to know before you go.

Cheapest flight found	Rs36,003
Cheapest month to fly	August

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

How much are return flights from Washington Dulles to Ontario International?

The best price we found for a return flight from Washington Dulles to Ontario International is Rs75,539. 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.

Which airlines fly direct from Washington Dulles to Ontario International?

Currently, there are no airlines that fly direct from Washington Dulles to Ontario International. But we found flights with one or more stops from Rs75,539.

How many flights are there a week from Washington Dulles to Ontario International?

As of August 2025, there are no flights flying from Washington Dulles to Ontario International.

When is the cheapest time to fly from Washington Dulles to Ontario International?

The cheapest month to fly from Washington Dulles to Ontario International is usually August.

Which upcoming date is cheapest to fly from Washington Dulles Airport to Ontario International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Ontario International Airport on Tuesday, 19 August 2025.

Can I get a direct flight from Washington Dulles Airport to Ontario International Airport?

No airlines currently offer direct flights between Washington Dulles Airport and Ontario International Airport. Most routes have one or more stops.

How can I find the best flight deal to Ontario International?

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.

When is the best time to book flights to Ontario?

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.

Which is the cheapest airline to fly from Washington Dulles Airport to Ontario International with?

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

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

The timezone in Ontario is UTC-7, which is three hours behind Washington DC.
Get to the airport on time so you don't miss your IAD to ONT flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to prevent a last-minute sprint to your gate.
During popular months such as April, it's best to get to the airport even earlier. Plan to arrive two hours before a domestic departure and four hours ahead for an international flight when you fly during a peak period in general.
Think about adding a stopover when booking your ticket from Washington Dulles International Airport to Ontario International Airport. Just deselect 'Direct flights only' to break up your journey, or perhaps see a new city along the way. Here's where you can stop between IAD and ONT:
- Phoenix Sky Harbour International Airport
- Denver International Airport
- Harry Reid Airport (formerly McCarran Airport)

How to find the cheapest flights from Washington Dulles International Airport (IAD) to Ontario International Airport (ONT)

At the moment, Rs36,003 is the lowest price we've seen for a one-way Washington Dulles International Airport to Ontario International Airport flight. The best price for a return plane ticket is Rs75,539. Keep in mind that fares may change due to demand at the time of booking.
Don't wait until the last minute. You're more likely to find cheap tickets from IAD to ONT if you book in advance. Airlines often have some terrific early bird discounts.
The 'Whole month' search tool shows you the cheapest flights from Washington Dulles International Airport to Ontario International Airport throughout the entire month. It's an easy way to snap up a bargain if your plans are flexible.
Stay on top of deals for cheap flights from IAD to ONT by creating a Price Alert. You'll get an email or push notification on the app when a lower fare pops up.
Discover the perfect flight for you by using the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Washington Dulles International Airport to Ontario International Airport, use the 'Sort by' function. You can also filter results by airline, arrival and departure times, and number of stops.

Handy information about Washington Dulles International Airport (IAD)

You'll find IAD at 1 Saarinen Circle.
74.39% of flights that depart Washington Dulles International Airport arrive at their destination on time.
To reach Washington Dulles International Airport from central Washington DC, it'll take around 50 minutes if you're travelling by car. This depends on traffic though. It's approximately 56 kilometres from the airport to the city centre.
Planning to catch public transport? You can expect a journey time of around 3 hours 25 minutes.
Booked an early flight from Washington Dulles International Airport to Ontario International Airport? Avoid the hassle of rushing to the terminal (and enjoy a little extra shut-eye) by picking one of these hotels close to IAD:

Arriving at Ontario International Airport (ONT)

If you're arriving on a late Washington Dulles International Airport to Ontario International Airport flight, few things beat the convenience of being close to the terminal. Pick up your bags from the carousel and then be resting not long after at one of these hotels near ONT:
Travel at your own speed with an Ontario International Airport rental car. Book your wheels from Dollar, Fox - Rent A Car or Thrifty and experience more of Ontario and beyond.
Lock in the lowest price by booking your ride from Ontario International Airport about three weeks before your travel date.

Getting from Ontario International Airport (ONT) to central Ontario

You'll find ONT at 2900 E. Airport Drive.
From Ontario International Airport, Ontario is approximately 6 kilometres away. It takes around 10 minutes to reach the centre driving.
When travelling by public transport, expect a journey of around 1 hour 30 minutes.

When to fly to Ontario International Airport (ONT)

August is the busiest month for flights from Washington Dulles International Airport to Ontario International Airport. To skip the crowds, travel to Ontario in May.
The warmest month in Ontario is August, with temperatures ranging between 15ºC and 35ºC. Lock in your flights from Washington Dulles International Airport to Ontario International Airport in this month if you enjoy this type of weather.
Search for cheap tickets from IAD to ONT in January if you'd rather travel during cooler conditions. Temperatures are at their lowest around then, ranging between 4ºC and 23ºC on average.

Explore more of United States

Los Angeles is just one of the many places in United States waiting to be discovered once you've taken in the sights of Ontario. Around 56 kilometres away to the west, its best attractions include Griffith Observatory, The Broad and La Brea Tar Pits & Museum.
San Diego is another must-experience destination in United States and is around 153 kilometres south of Ontario. No trip is complete without experiencing San Diego Zoo, USS Midway Museum and SeaWorld San Diego.