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Cheap flights from Ontario to Washington, D.C. from $61

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 1/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
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
8:36 am - 9:59 pm
ONT
-
DCA
10h 23m1 stop
Frontier Logo
6:00 pm - 11:59 pm
DCA
-
ONT
8h 59m1 stop
$138Frontier
Tue, Feb 10 - Sat, Feb 14
Frontier Logo
7:15 am - 1:02 pm
ONT
-
DCA
26h 47m1 stop
Frontier Logo
6:00 pm - 3:07 pm
DCA
-
ONT
24h 07m1 stop
$142Frontier
Wed, Jan 21 - Tue, Jan 27
Frontier Logo
7:15 am - 4:59 pm
ONT
-
DCA
6h 44m1 stop
Frontier Logo
6:00 pm - 11:24 pm
DCA
-
ONT
8h 24m1 stop
$148Frontier
Wed, Jan 21 - Sat, Jan 24
Frontier Logo
7:15 am - 4:59 pm
ONT
-
DCA
6h 44m1 stop
Frontier Logo
8:59 am - 3:07 pm
DCA
-
ONT
9h 08m1 stop
$150Frontier
Wed, Jan 21 - Wed, Jan 28
Frontier Logo
7:15 am - 9:59 pm
ONT
-
DCA
11h 44m1 stop
Frontier Logo
2:00 pm - 12:20 am
DCA
-
ONT
13h 20m1 stop
$154Frontier
Sat, Jan 31 - Thu, Feb 5
Multiple Airlines Logo
1:46 pm - 10:27 am
ONT
-
BWI
17h 41m1 stop
Multiple Airlines Logo
7:10 am - 3:07 pm
BWI
-
ONT
10h 57m2 stops
$221Multiple Airlines
Mon, Jan 26 - Wed, Jan 28
Multiple Airlines Logo
3:23 pm - 10:27 am
ONT
-
BWI
16h 04m1 stop
Multiple Airlines Logo
11:38 am - 1:37 pm
BWI
-
ONT
28h 59m2 stops
$235Multiple Airlines
Mon, Jan 19 - Mon, Jan 26
Alaska Airlines Logo
4:03 pm - 4:26 pm
ONT
-
IAD
21h 23m1 stop
Alaska Airlines Logo
6:04 pm - 3:08 pm
IAD
-
ONT
24h 04m1 stop
$246Alaska Airlines
Wed, Jan 21 - Tue, Jan 27
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
$247Delta
Tue, Jan 13 - Sat, Jan 17
Delta Logo
7:30 am - 11:57 pm
ONT
-
IAD
13h 27m2 stops
Delta Logo
7:30 am - 1:56 pm
IAD
-
ONT
9h 26m1 stop
$252Delta
Tue, Jan 13 - Tue, Jan 20

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

Our best Alaska Airlines deals on Ontario to Washington, D.C. flight tickets
Alaska Airlines
Jan 21
ONT4:03 pmOntario
21h 23m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Jan 27
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 pmOntario
$246
Find similar
Alaska Airlines
Jan 21
ONT11:53 amOntario
25h 33m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Jan 28
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 pmOntario
$271
Find similar
Alaska Airlines
Jan 27
ONT4:03 pmOntario
21h 23m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Jan 30
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 pmOntario
$272
Find similar

Delta flights from Ontario to Washington, D.C.

Our best Delta deals on Ontario to Washington, D.C. flight tickets
Delta
Jan 13
ONT7:30 amOntario
12h 40m
1 stop
IAD11:10 pmWashington, D.C. Dulles Intl
Jan 17
IAD7:30 amWashington, D.C. Dulles Intl
9h 26m
1 stop
ONT1:56 pmOntario
$247
Find similar
Delta
Jan 13
ONT7:30 amOntario
13h 27m
2 stops
IAD11:57 pmWashington, D.C. Dulles Intl
Jan 20
IAD7:30 amWashington, D.C. Dulles Intl
9h 26m
1 stop
ONT1:56 pmOntario
$252
Find similar
Delta
Jan 13
ONT7:30 amOntario
13h 27m
2 stops
IAD11:57 pmWashington, D.C. Dulles Intl
Jan 20
IAD7:30 amWashington, D.C. Dulles Intl
11h 45m
2 stops
ONT4:15 pmOntario
$258
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 23, 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

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 2/10

8:36 am-9:59 pm

1 stop10h 23m

Washington, D.C. Reagan-National

Sat 2/14

6:00 pm-11:59 pm

1 stop8h 59m

$138

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 1/21

7:15 am-1:02 pm

1 stop26h 47m

Washington, D.C. Reagan-National

Tue 1/27

6:00 pm-3:07 pm

1 stop24h 07m

$142

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 1/21

7:15 am-4:59 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Sat 1/24

6:00 pm-11:24 pm

1 stop8h 24m

$148

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 1/21

7:15 am-4:59 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Wed 1/28

8:59 am-3:07 pm

1 stop9h 08m

$150

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 1/31

7:15 am-9:59 pm

1 stop11h 44m

Washington, D.C. Reagan-National

Thu 2/5

2:00 pm-12:20 am

1 stop13h 20m

$154

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 1/26

1:46 pm-10:27 am

1 stop17h 41m

Baltimore/Washington

Wed 1/28

7:10 am-3:07 pm

2 stops10h 57m

$221

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Mon 1/19

3:23 pm-10:27 am

1 stop16h 04m

Baltimore/Washington

Mon 1/26

11:38 am-1:37 pm

2 stops28h 59m

$235

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 1/21

4:03 pm-4:26 pm

1 stop21h 23m

Washington, D.C. Dulles Intl

Tue 1/27

6:04 pm-3:08 pm

1 stop24h 04m

$246

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/13

7:30 am-11:10 pm

1 stop12h 40m

Washington, D.C. Dulles Intl

Sat 1/17

7:30 am-1:56 pm

1 stop9h 26m

$247

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/13

7:30 am-11:57 pm

2 stops13h 27m

Washington, D.C. Dulles Intl

Tue 1/20

7:30 am-1:56 pm

1 stop9h 26m

$252

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 $414. 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 $557.

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 $381. 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

$238

Fastest flight time

4h 40m

Direct flights

Mon, Tue, 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 $238. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $515.
The fastest flight from Ontario to Washington, D.C. takes 4h 40m
Direct flights go from Ontario to Washington, D.C. on Monday, Tuesday, 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
8,194 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.8
3,074 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,106 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,253 reviews
Search Southwest flights
DeltaPriceFrom $276Free CancellationRating
7.9
8,014 reviews
Search Delta flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,050 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
Waldorf
Woodbridge
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.

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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