Cheap flights from Ontario to Washington, D.C. from $85
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 12/17. 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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Not ready to book? to track prices.Frontier flights from Ontario to Washington, D.C. Dulles Intl Airport
Our best Frontier deals on Ontario to Washington, D.C. Dulles Intl Airport flight tickets
Delta flights from Ontario to Washington, D.C. Dulles Intl Airport
Our best Delta deals on Ontario to Washington, D.C. Dulles Intl Airport flight tickets
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Use the filters below to find and compare flights from Ontario to Washington, D.C. Dulles Intl Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Sat 10/24
5:25 pm-6:20 am
1 stop9h 55m
Washington, D.C. Dulles Intl
Thu 10/29
12:31 pm-7:08 pm
1 stop9h 37m
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Mon 11/2
8:03 pm-11:36 am
1 stop12h 33m
Washington, D.C. Dulles Intl
Mon 11/9
12:31 pm-7:08 pm
1 stop9h 37m
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Wed 11/4
9:25 am-8:51 pm
1 stop8h 26m
Washington, D.C. Dulles Intl
Fri 11/6
2:38 pm-8:15 pm
1 stop8h 37m
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Mon 11/2
8:03 pm-11:36 am
1 stop12h 33m
Washington, D.C. Dulles Intl
Tue 11/3
5:17 pm-11:18 am
1 stop21h 01m
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Tue 10/27
11:13 am-11:59 pm
1 stop9h 46m
Washington, D.C. Dulles Intl
Thu 10/29
12:31 pm-7:08 pm
1 stop9h 37m
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Fri 12/4
1:11 pm-11:47 pm
1 stop7h 36m
Washington, D.C. Dulles Intl
Wed 1/6
7:15 am-12:30 pm
1 stop8h 15m
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Wed 11/18
1:15 pm-11:47 pm
1 stop7h 32m
Washington, D.C. Dulles Intl
Fri 12/4
6:00 am-11:07 am
1 stop8h 07m
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Thu 1/28
12:45 pm-10:55 pm
1 stop7h 10m
Washington, D.C. Dulles Intl
Tue 2/2
7:00 am-1:28 pm
1 stop9h 28m
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Tue 11/3
7:00 am-5:24 pm
1 stop7h 24m
Washington, D.C. Dulles Intl
Fri 11/6
4:10 pm-8:51 pm
1 stop7h 41m
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Thu 10/29
12:43 pm-11:23 pm
1 stop7h 40m
Washington, D.C. Dulles Intl
Fri 11/6
7:09 pm-9:40 am
1 stop17h 31m
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 typical price of a round-trip flight between Ontario and Washington, D.C. Dulles Intl Airport?
Prices are currently low for flights on this route.
Typical prices usually range from $318 to $636.The lowest price recently found on this route was $262.
What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?
In general, February 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 $448. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of February, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $452.
What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?
Our data shows that Wednesday 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 $467. 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 $646.
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 $427 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 $605 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.
Can stopping save me money on Ontario to Washington, D.C. Dulles Intl Airport flights?
You could potentially save up to 26% on your flight if you consider stops on a Ontario to Washington, D.C. Dulles Intl Airport flight.
What is the cheapest airline that flies from Ontario to Washington, D.C. Dulles Intl?
Delta, Alaska Airlines, and United 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, American Airlines and Frontier 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 83% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 7 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.
Which airport is the most popular layover for flights between Ontario and Washington, D.C. Dulles Intl Airport?
Phoenix (PHX) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from Ontario to Washington, D.C. Dulles Intl Airport?
Flights via Dallas (DFW) offer the lowest average round-trip price of $312.
Which layover airport has the shortest travel time from Ontario to Washington, D.C. Dulles Intl Airport?
Flights connecting via Dallas (DFW) have the shortest average one-way travel time: 7h 06m.
Which layover airport has the shortest connection time from Ontario to Washington, D.C. Dulles Intl Airport?
Dallas (DFW) has the shortest average layover time for this route: 1h 24m.
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
Frequently asked questions about flying 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 28m 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 October 2026, 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 (35% of total bookings). The next most popular airlines are American Airlines (22%), Southwest (16%), and Frontier (15%).
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 $192 | Free Cancellation | Rating 5.6 2,551 reviews | |||
| PriceFrom $318 | Free Cancellation | Rating 7.8 8,646 reviews | |||
| PriceFrom $318 | Free Cancellation | Rating 7.0 12,146 reviews | |||
| PriceFrom $340 | Free Cancellation | Rating 7.9 4,224 reviews | |||
| PriceFrom $349 | Free Cancellation | Rating 7.4 10,322 reviews |
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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.