Cheap flights from Ontario to Washington, D.C. from $136
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Washington, D.C. departing on 8/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Alaska Airlines flights from Ontario to Washington, D.C. Dulles Intl Airport
Our best Alaska Airlines deals on Ontario to Washington, D.C. Dulles Intl Airport flight tickets
American Airlines flights from Ontario to Washington, D.C. Dulles Intl Airport
Our best American Airlines deals on Ontario to Washington, D.C. Dulles Intl Airport flight tickets
See travel insights to Washington, D.C. from
How to get the cheapest flight ticket from Ontario to Washington, D.C. Dulles Intl Airport
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?
In general, August is the cheapest month to fly from Ontario to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $356. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of August, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $396.
What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?
Our data shows that Thursday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $413. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Washington, D.C. Dulles Intl Airport for around $555.
What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?
Flying to Washington, D.C. Dulles Intl Airport from Ontario in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $371 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $575 on average. Flights to Washington, D.C. Dulles Intl Airport from Ontario at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.
How far in advance should I book a flight to Washington, D.C. Dulles Intl Airport?
You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Ontario when booking 23 weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $452 when searching 23 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Ontario for as low as $297 on momondo.
What is the cheapest airline that flies from Ontario to Washington, D.C. Dulles Intl?
Frontier, Hawaiian Airlines, and Alaska Airlines are the most popular carriers operating from Ontario to Washington, D.C. Dulles Intl
What airlines fly to Washington, D.C. Dulles Intl Airport?
United Airlines, Alaska Airlines and American Airlines are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from Ontario according to our data. United Airlines is the first choice among our users, with 70% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 8 different airlines that fly to Washington, D.C. Dulles Intl Airport on a routine basis, so you have a few additional options to choose from.
When to book flights from Ontario to Washington, D.C. Dulles Intl Airport
Cheap Ontario to Washington, D.C. Dulles Intl Airport (ONT to IAD) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Ontario to Washington, D.C. Dulles Intl Airport
How far is Ontario to Washington, D.C. Dulles Intl by plane?
The distance between Ontario and Washington, D.C. Dulles Intl is about 2238.2 mi. 6h 57m is a normal flight duration for this route.
When did momondo last update prices for flights from Ontario Airport to Washington, D.C. Dulles Intl Airport?
Prices for flights from Ontario Airport to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Ontario Airport to Washington, D.C. Dulles Intl Airport?
As of June 2025, there are 5 operators available to choose from for flights from Ontario Airport to Washington, D.C. Dulles Intl Airport.
How old do you have to be to fly from Ontario Airport to Washington, D.C. Dulles Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Washington, D.C. Dulles Intl Airport.
What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?
The necessary travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Ontario to Washington, D.C. Dulles Intl Airport?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Ontario to Washington, D.C. Dulles Intl Airport is United Airlines (31% of total bookings). The next most popular airlines are American Airlines (28%), Southwest (18%), and Delta (18%).
Best airlines flying from Ontario to Washington, D.C. Dulles Intl Airport
Compare and see reviews for airlines that fly from Ontario to Washington, D.C. Dulles Intl Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $141 | Free Cancellation | Rating 5.9 3,295 reviews | |||
| PriceFrom $286 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $286 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $316 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $326 | Free Cancellation | Rating 8.0 4,287 reviews |
Traveling to a place near Washington, D.C.?
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Why should I use momondo to find a flight deal from Ontario to Washington, D.C.?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Washington, D.C.. momondo saves you time and could save you money on your trip.
Can I find flights from Ontario to Washington, D.C. with flexible booking policies on momondo?
Yes. All flights to Washington, D.C. from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Ontario to Washington, D.C.?
momondo helps you find the best flight between Ontario and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.
I’m not ready to book a flight from Ontario to Washington, D.C. right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Ontario to Washington, D.C. flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.