Cheap Flights from Washington (IAD) to Ontario (ONO)

Popular airlines from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal)

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal) cost?
Secure a cheap one-way flight or cheap return flight from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal)?
The cheapest month to fly from IAD to ONO is , when there's less demand. Off-peak season is often when airlines offer better prices between these airports.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal)?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from IAD to ONO. Then, sort your results by "Price (lowest to highest)" to snag a good deal.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal)?
There are no daily direct flights departing from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal). But you can opt for flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from IAD to ONO?
Usually you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* However, this can change depending on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal)?
To avoid potential delays on the Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal) route, travel before 3 PM. Departures after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal) last-minute?
Last-minute fares from IAD to ONO are usually more expensive. For the cheapest rates, start searching for flights as soon as possible. That being said, if you can play around with your travel dates, you may score a cheap ticket right before your journey.
Is it cheaper to book an IAD to ONO flight and hotel package?
Compared with arranging hotels and flights separately, booking an IAD to ONO flight and hotel package with Expedia could result in significant savings. What's more, managing everything in one place takes the hassle out of planning your trip. Simply pick your flights and choose from our extensive range of hotels, then personalize your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Ontario, OR (ONO-Ontario Municipal)?
It's usually possible to cancel or reschedule your IAD to ONO flight. However, for bookings made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Ontario Municipal
Distance
2056 mi

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Washington to Ontario Flights

The cheapest times to fly from Washington to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Ontario are during the month of . You can find some of the cheapest flights from Washington to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Ontario

Sunday is one of the best days to book for cheap flights from Washington to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Washington to Ontario Flights

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*Available to One Key members.