Cheap Flights From Washington Dulles Intl. (IAD) To Ontario Intl. Airport (ONT)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly

Cheapest Flights from Washington (IAD) to Ontario Intl. Airport (ONT)

The cheapest flights to Ontario Intl. Airport found within the past 7 days were CA $885 round trip and one way. Prices and availability subject to change. Additional terms may apply.

Thu, Nov 19 - Wed, Nov 25
IAD
Washington
ONT
Ontario
CA $885 Roundtrip, found 2 days ago
CA $885
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu, Nov 19 from Washington to Ontario, returning Wed, Nov 25, priced at CA $885 found 2 days ago
Fri, Sep 11 - Sun, Sep 13
IAD
Washington
ONT
Ontario
CA $1,019 Roundtrip, found 13 hours ago
CA $1,019
Roundtrip
found 13 hours ago
Select Alaska Airlines flight, departing Fri, Sep 11 from Washington to Ontario, returning Sun, Sep 13, priced at CA $1,019 found 13 hours ago
Fri, Sep 11 - Sun, Sep 13
IAD
Washington
ONT
Ontario
CA $1,405 Roundtrip, found 13 hours ago
CA $1,405
Roundtrip
found 13 hours ago
Select Alaska Airlines flight, departing Fri, Sep 11 from Washington to Ontario, returning Sun, Sep 13, priced at CA $1,405 found 13 hours ago

Frequently asked questions

Are there direct flights from IAD to ONT?
You can't get a flight direct from IAD to Los Angeles - Ontario Intl. Airport (ONT), but there's no need to stress. United Airlines, Delta and American Airlines operate flights with only one stopover.
What airlines fly from IAD to Ontario Airport?
No airlines are currently offering direct flights between IAD and ONT. Save time and avoid unnecessary stopovers by investigating the best routes well in advance.
What is the best day to buy a plane ticket?
Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you're looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you're browsing flight deals.
What are the cheapest days to fly?
Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.
How far in advance can you book a flight?
Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.