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Cheap flights from Ontario to Washington, D.C. from $64

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 1/8. 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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0 bags

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Find the cheapest flights from Ontario to Washington, D.C.

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:05 pm - 9:17 amONT-BWI
16h 12m1 stop
Multiple Airlines Logo
11:14 am - 4:33 pmBWI-ONT
32h 19m1 stop
$185Multiple Airlines
Find Deal
Fri, Dec 5 - Sun, Dec 7
Multiple Airlines Logo
2:05 pm - 9:17 amONT-BWI
16h 12m1 stop
Multiple Airlines Logo
9:13 am - 2:25 pmBWI-ONT
32h 12m2 stops
$199Multiple Airlines
Find Deal
Fri, Dec 5 - Sun, Dec 7
Frontier Logo
8:00 am - 5:47 pmONT-BWI
30h 47m2 stops
Frontier Logo
10:00 pm - 6:03 pmBWI-ONT
23h 03m1 stop
$208Frontier
Find Deal
Wed, Jan 7 - Sun, Jan 11
Frontier Logo
7:33 pm - 7:43 pmONT-BWI
21h 10m1 stop
Frontier Logo
8:00 am - 9:17 pmBWI-ONT
16h 17m2 stops
$211Frontier
Find Deal
Thu, Dec 11 - Wed, Dec 17
Southwest Logo
5:50 am - 4:55 pmONT-BWI
8h 05m2 stops
Southwest Logo
1:05 pm - 8:55 pmBWI-ONT
10h 50m2 stops
$326Southwest
Find Deal
Sun, Dec 14 - Tue, Dec 16
United Airlines Logo
5:05 am - 5:25 pmONT-BWI
9h 20m2 stops
United Airlines Logo
1:10 pm - 10:49 pmBWI-ONT
12h 39m2 stops
$327United Airlines
Find Deal
Tue, Dec 2 - Tue, Dec 9
Southwest Logo
5:55 am - 5:05 pmONT-IAD
8h 10m1 stop
Southwest Logo
7:40 am - 3:20 pmIAD-ONT
10h 40m2 stops
$330Southwest
Find Deal
Thu, Dec 11 - Wed, Dec 17
American Airlines Logo
7:30 pm - 10:20 amONT-IAD
11h 50m2 stops
American Airlines Logo
2:16 pm - 10:00 pmIAD-ONT
10h 44m2 stops
$335American Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
United Airlines Logo
5:05 am - 3:01 pmONT-IAD
6h 56m1 stop
United Airlines Logo
6:30 am - 12:17 pmIAD-ONT
8h 47m1 stop
$336United Airlines
Find Deal
Thu, Dec 11 - Wed, Dec 17
American Airlines Logo
9:59 am - 11:59 pmONT-IAD
11h 00m2 stops
American Airlines Logo
6:34 am - 3:24 pmIAD-ONT
11h 50m2 stops
$349American Airlines
Find Deal
Thu, Nov 20 - Thu, Nov 27

Delta flights from Ontario to Washington, D.C.

Our best Delta deals on Ontario to Washington, D.C. flight tickets
Delta
Dec 3
ONT12:12 pmOntario
6h 56m
1 stop
BWI10:08 pmBaltimore/Washington
Dec 12
BWI4:49 pmBaltimore/Washington
9h 15m
1 stop
ONT11:04 pmOntario
$295
Find similar
Delta
Dec 4
ONT10:25 pmOntario
7h 53m
1 stop
BWI9:18 amBaltimore/Washington
Dec 15
BWI4:49 pmBaltimore/Washington
10h 09m
2 stops
ONT11:58 pmOntario
$300
Find similar
Delta
Dec 4
ONT4:49 pmOntario
13h 29m
2 stops
BWI9:18 amBaltimore/Washington
Dec 10
BWI1:52 pmBaltimore/Washington
13h 06m
2 stops
ONT11:58 pmOntario
$305
Find similar

United Airlines flights from Ontario to Washington, D.C.

Our best United Airlines deals on Ontario to Washington, D.C. flight tickets
United Airlines
Dec 2
ONT5:05 amOntario
9h 20m
2 stops
BWI5:25 pmBaltimore/Washington
Dec 9
BWI1:10 pmBaltimore/Washington
12h 39m
2 stops
ONT10:49 pmOntario
$327
Find similar
United Airlines
Dec 11
ONT5:05 amOntario
6h 56m
1 stop
IAD3:01 pmWashington, D.C. Dulles Intl
Dec 17
IAD6:30 amWashington, D.C. Dulles Intl
8h 47m
1 stop
ONT12:17 pmOntario
$336
Find similar
United Airlines
Dec 13
ONT5:05 amOntario
6h 56m
1 stop
IAD3:01 pmWashington, D.C. Dulles Intl
Dec 29
IAD5:31 pmWashington, D.C. Dulles Intl
7h 54m
1 stop
ONT10:25 pmOntario
$404
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Washington, D.C. that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated October 31, 2025.
Use the filters below to find and compare flights from Ontario to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 12/5

2:05 pm-9:17 am

1 stop16h 12m

Baltimore/Washington

Sun 12/7

11:14 am-4:33 pm

1 stop32h 19m

$185

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 12/5

2:05 pm-9:17 am

1 stop16h 12m

Baltimore/Washington

Sun 12/7

9:13 am-2:25 pm

2 stops32h 12m

$199

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 1/7

8:00 am-5:47 pm

2 stops30h 47m

Baltimore/Washington

Sun 1/11

10:00 pm-6:03 pm

1 stop23h 03m

$208

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 12/11

7:33 pm-7:43 pm

1 stop21h 10m

Baltimore/Washington

Wed 12/17

8:00 am-9:17 pm

2 stops16h 17m

$211

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sun 12/14

5:50 am-4:55 pm

2 stops8h 05m

Baltimore/Washington

Tue 12/16

1:05 pm-8:55 pm

2 stops10h 50m

$326

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Tue 12/2

5:05 am-5:25 pm

2 stops9h 20m

Baltimore/Washington

Tue 12/9

1:10 pm-10:49 pm

2 stops12h 39m

$327

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 12/11

5:55 am-5:05 pm

1 stop8h 10m

Washington, D.C. Dulles Intl

Wed 12/17

7:40 am-3:20 pm

2 stops10h 40m

$330

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 12/4

7:30 pm-10:20 am

2 stops11h 50m

Washington, D.C. Dulles Intl

Mon 12/8

2:16 pm-10:00 pm

2 stops10h 44m

$335

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 12/11

5:05 am-3:01 pm

1 stop6h 56m

Washington, D.C. Dulles Intl

Wed 12/17

6:30 am-12:17 pm

1 stop8h 47m

$336

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 11/20

9:59 am-11:59 pm

2 stops11h 00m

Washington, D.C. Dulles Intl

Thu 11/27

6:34 am-3:24 pm

2 stops11h 50m

$349

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Ontario to Washington, D.C.

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.?

The month of September is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $226. If you’re not able to fly to Washington, D.C. in September, then May is your next best option. Flight prices from Ontario to Washington, D.C. during May average around $228.

What is the cheapest day to depart on your flight to Washington, D.C.?

On average, the least expensive day to fly to Washington, D.C. from Ontario is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $417. However, this price may fluctuate depending on the airline, the season, and holidays. 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. for around $579.

What is the cheapest time of day to depart on your flight to Washington, D.C.?

In the afternoon is the cheapest time of day to fly from Ontario to Washington, D.C. when you can find flight prices for as low as $390. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the evening because they tend to be around $472. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Ontario to Washington, D.C. flight route?

Fly from Ontario to Baltimore/Washington for the best Ontario - Washington, D.C. flight prices

How far in advance should I book a flight to Washington, D.C.?

You are more likely to see cheaper flights to Washington, D.C. from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $460 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from Ontario for as low as $297 on momondo.

What cabin class options are available on Ontario to Washington, D.C. flights?

There is only 1 cabin class available to choose from on Ontario to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to Washington, D.C. flights?

You could potentially save up to 44% on your flight if you consider stops on a Ontario to Washington, D.C. flight.

How have Ontario to Washington, D.C. flight prices changed over time?

As of October 2025, prices for Ontario to Washington, D.C. flights are approximately 9% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Washington, D.C. according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Washington, D.C. (ONT to WAS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Washington, D.C.

Best Price Found

$208

Fastest flight time

4h 40m

Direct flights

Every day

Airports in Washington, D.C.

1 airport
The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $208. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $461.
The fastest flight from Ontario to Washington, D.C. takes 4h 40m
Direct flights go from Ontario to Washington, D.C. every day.
There is 1 airport near Washington, D.C.: Baltimore/Washington (BWI)
Search flight deals

  • How far is Ontario to Washington, D.C. by plane?

    Ontario and Washington, D.C. are 2260.6 mi apart from one another. In terms of flight time, this usually takes a little over 6h 15m.

  • When did momondo last update prices for flights from Ontario Airport to Washington, D.C.?

    Prices for flights from Ontario Airport to Washington, D.C. are refreshed on a daily basis.

  • How many operators does momondo search for flights from Ontario Airport to Washington, D.C.?

  • How old do you have to be to fly from Ontario Airport to Washington, D.C.?

    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..

  • What documentation or ID do you need to fly to Washington, D.C.?

    The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Ontario to Washington, D.C.?

  • What is the most popular airline from Ontario to Washington, D.C.?

Best airlines flying from Ontario to Washington, D.C.

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $98Free CancellationRating
6.3
8,115 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.8
3,123 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
8,996 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,243 reviews
Search Southwest flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,034 reviews
Search American Airlines flights
DeltaPriceFrom $284Free CancellationRating
7.9
7,998 reviews
Search Delta flights

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
National Harbor
Gettysburg
Arlington
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Rockville
Manassas
Reston
Gaithersburg
Fairfax
Glen Burnie
Springfield
Linthicum Heights

Why use momondo?

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. momondo allows you to filter the results for Ontario to Washington, D.C. flights to just show those with flexible booking policies.

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.

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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport