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Cheap flights from Ontario to Washington, D.C. from $62

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 1/24. 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.
Frontier Logo
10:18 pm - 10:36 pm
ONT
-
BWI
45h 18m2 stops
Frontier Logo
12:42 pm - 7:01 pm
BWI
-
ONT
9h 19m1 stop
$171Frontier
Mon, Jan 12 - Sun, Jan 18
Multiple Airlines Logo
3:46 pm - 10:27 am
ONT
-
BWI
15h 41m1 stop
Multiple Airlines Logo
12:42 pm - 7:01 pm
BWI
-
ONT
9h 19m1 stop
$184Multiple Airlines
Mon, Jan 12 - Sun, Jan 18
Frontier Logo
7:56 pm - 11:39 am
ONT
-
BWI
12h 43m1 stop
Frontier Logo
7:58 pm - 12:43 pm
BWI
-
ONT
19h 45m1 stop
$195Frontier
Thu, Jan 15 - Thu, Jan 22
Frontier Logo
7:56 pm - 11:39 am
ONT
-
BWI
12h 43m1 stop
Frontier Logo
12:42 pm - 7:01 pm
BWI
-
ONT
9h 19m1 stop
$217Frontier
Thu, Jan 15 - Sun, Jan 18
Multiple Airlines Logo
1:46 pm - 10:27 am
ONT
-
BWI
17h 41m1 stop
Multiple Airlines Logo
11:38 am - 1:52 pm
BWI
-
ONT
29h 14m2 stops
$218Multiple Airlines
Fri, Feb 6 - Mon, Feb 9
Multiple Airlines Logo
2:34 pm - 10:21 am
ONT
-
BWI
16h 47m2 stops
Multiple Airlines Logo
8:08 pm - 9:23 pm
BWI
-
ONT
28h 15m1 stop
$222Multiple Airlines
Thu, Jan 8 - Sun, Jan 11
Alaska Airlines Logo
11:53 am - 4:26 pm
ONT
-
IAD
25h 33m1 stop
Alaska Airlines Logo
6:04 pm - 8:36 pm
IAD
-
ONT
29h 32m1 stop
$306Alaska Airlines
Tue, Jan 13 - Tue, Jan 20
Delta Logo
7:30 am - 11:10 pm
ONT
-
IAD
12h 40m1 stop
Delta Logo
7:30 am - 1:56 pm
IAD
-
ONT
9h 26m1 stop
$307Delta
Wed, Jan 7 - Tue, Jan 20
Delta Logo
7:30 am - 11:48 pm
ONT
-
IAD
13h 18m2 stops
Delta Logo
7:30 am - 1:56 pm
IAD
-
ONT
9h 26m1 stop
$312Delta
Tue, Jan 13 - Tue, Jan 20
Alaska Airlines Logo
4:02 pm - 5:20 pm
ONT
-
IAD
22h 18m1 stop
Alaska Airlines Logo
6:27 pm - 11:08 am
IAD
-
ONT
19h 41m1 stop
$326Alaska Airlines
Tue, Feb 17 - Mon, Mar 2

Delta flights from Ontario to Washington, D.C.

Our best Delta deals on Ontario to Washington, D.C. flight tickets
Delta
Feb 3
ONT7:30 amOntario
12h 56m
2 stops
BWI11:26 pmBaltimore/Washington
Feb 10
BWI1:02 pmBaltimore/Washington
12h 42m
2 stops
ONT10:44 pmOntario
$296
Find similar
Delta
Jan 7
ONT7:30 amOntario
12h 40m
1 stop
IAD11:10 pmWashington, D.C. Dulles Intl
Jan 18
IAD7:30 amWashington, D.C. Dulles Intl
9h 26m
1 stop
ONT1:56 pmOntario
$307
Find similar
Delta
Jan 13
ONT7:30 amOntario
13h 18m
2 stops
IAD11:48 pmWashington, D.C. Dulles Intl
Jan 20
IAD7:30 amWashington, D.C. Dulles Intl
9h 26m
1 stop
ONT1:56 pmOntario
$312
Find similar

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

Our best American Airlines deals on Ontario to Washington, D.C. flight tickets
American Airlines
Jan 20
ONT9:59 amOntario
9h 05m
2 stops
DCA10:04 pmWashington, D.C. Reagan-National
Jan 24
DCA1:34 pmWashington, D.C. Reagan-National
8h 11m
1 stop
ONT6:45 pmOntario
$352
Find similar
American Airlines
Jan 8
ONT7:30 pmOntario
11h 49m
2 stops
BWI10:19 amBaltimore/Washington
Jan 11
BWI6:00 amBaltimore/Washington
9h 38m
2 stops
ONT12:38 pmOntario
$357
Find similar
American Airlines
Jan 5
ONT10:40 pmOntario
9h 18m
1 stop
IAD10:58 amWashington, D.C. Dulles Intl
Jan 14
IAD5:26 pmWashington, D.C. Dulles Intl
8h 22m
1 stop
ONT10:48 pmOntario
$369
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 December 15, 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

Mon 1/12

10:18 pm-10:36 pm

2 stops45h 18m

Baltimore/Washington

Sun 1/18

12:42 pm-7:01 pm

1 stop9h 19m

$171

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 1/12

3:46 pm-10:27 am

1 stop15h 41m

Baltimore/Washington

Sun 1/18

12:42 pm-7:01 pm

1 stop9h 19m

$184

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 1/15

7:56 pm-11:39 am

1 stop12h 43m

Baltimore/Washington

Thu 1/22

7:58 pm-12:43 pm

1 stop19h 45m

$195

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 1/15

7:56 pm-11:39 am

1 stop12h 43m

Baltimore/Washington

Sun 1/18

12:42 pm-7:01 pm

1 stop9h 19m

$217

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 2/6

1:46 pm-10:27 am

1 stop17h 41m

Baltimore/Washington

Mon 2/9

11:38 am-1:52 pm

2 stops29h 14m

$218

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 1/8

2:34 pm-10:21 am

2 stops16h 47m

Baltimore/Washington

Sun 1/11

8:08 pm-9:23 pm

1 stop28h 15m

$222

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/13

11:53 am-4:26 pm

1 stop25h 33m

Washington, D.C. Dulles Intl

Tue 1/20

6:04 pm-8:36 pm

1 stop29h 32m

$306

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 1/7

7:30 am-11:10 pm

1 stop12h 40m

Washington, D.C. Dulles Intl

Tue 1/20

7:30 am-1:56 pm

1 stop9h 26m

$307

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/13

7:30 am-11:48 pm

2 stops13h 18m

Washington, D.C. Dulles Intl

Tue 1/20

7:30 am-1:56 pm

1 stop9h 26m

$312

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 2/17

4:02 pm-5:20 pm

1 stop22h 18m

Washington, D.C. Dulles Intl

Mon 3/2

6:27 pm-11:08 am

1 stop19h 41m

$326

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 typical price of a round-trip flight between Ontario and Washington, D.C.?

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 $416. 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 $563.

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 $382. 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 $460. 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 $462 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 43% 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 December 2025, prices for Ontario to Washington, D.C. flights are approximately 7% cheaper 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

$218

Fastest flight time

4h 40m

Direct flights

Mon, Thu, Fri, Sat and Sun

Airports in Washington, D.C.

2 airports
The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $218. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $533.
The fastest flight from Ontario to Washington, D.C. takes 4h 40m
Direct flights go from Ontario to Washington, D.C. on Monday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There are 2 airports in Washington, D.C.. From Ontario there are direct flights to 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 4h 40m.

  • 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
8,187 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.8
3,080 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
7.9
4,249 reviews
Search Southwest flights
DeltaPriceFrom $276Free CancellationRating
7.9
8,008 reviews
Search Delta flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,051 reviews
Search American Airlines 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
Gaithersburg
Reston
Manassas
Fairfax
Glen Burnie
Linthicum Heights
Bethesda

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.

An easier way to manage your Washington, D.C. trip

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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