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Cheap flights from Ontario to District of Columbia from $72

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 District of Columbia departing on 3/10. 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 District of Columbia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:20 am - 4:59 pm
ONT
-
DCA
7h 39m1 stop
Frontier Logo
6:00 pm - 12:20 am
DCA
-
ONT
9h 20m1 stop
$138Frontier
Thu, Jan 29 - Sun, Feb 1
Frontier Logo
6:20 am - 1:02 pm
ONT
-
DCA
27h 42m1 stop
Frontier Logo
8:59 am - 3:07 pm
DCA
-
ONT
9h 08m1 stop
$141Frontier
Sun, Feb 1 - Wed, Feb 4
Frontier Logo
6:20 am - 4:59 pm
ONT
-
DCA
7h 39m1 stop
Frontier Logo
6:00 pm - 9:34 pm
DCA
-
ONT
30h 34m1 stop
$143Frontier
Thu, Feb 5 - Mon, Feb 9
Frontier Logo
8:40 am - 9:59 pm
ONT
-
DCA
10h 19m1 stop
Frontier Logo
2:00 pm - 11:59 pm
DCA
-
ONT
12h 59m1 stop
$149Frontier
Wed, Mar 4 - Tue, Mar 10
Frontier Logo
6:15 am - 4:59 pm
ONT
-
DCA
7h 44m1 stop
Frontier Logo
6:00 pm - 11:59 pm
DCA
-
ONT
8h 59m1 stop
$150Frontier
Wed, Mar 18 - Sat, Apr 4
Frontier Logo
6:15 am - 9:59 pm
ONT
-
DCA
12h 44m1 stop
Frontier Logo
8:00 am - 11:59 pm
DCA
-
ONT
18h 59m1 stop
$151Frontier
Sat, Mar 28 - Wed, Apr 1
Frontier Logo
7:15 am - 4:59 pm
ONT
-
DCA
6h 44m1 stop
Frontier Logo
6:00 pm - 12:20 am
DCA
-
ONT
9h 20m1 stop
$158Frontier
Wed, Jan 28 - Sun, Feb 1
Southwest Logo
1:10 pm - 12:15 am
ONT
-
IAD
8h 05m1 stop
Southwest Logo
5:50 am - 9:55 am
IAD
-
ONT
7h 05m1 stop
$264Southwest
Thu, Mar 12 - Tue, Mar 17
Southwest Logo
1:10 pm - 12:15 am
ONT
-
IAD
8h 05m1 stop
Southwest Logo
4:45 pm - 10:35 pm
IAD
-
ONT
8h 50m2 stops
$269Southwest
Thu, Mar 12 - Tue, Mar 17
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
$287Alaska Airlines
Thu, Jan 29 - Mon, Feb 2

Southwest flights from Ontario to District of Columbia

Our best Southwest deals on Ontario to District of Columbia flight tickets
Southwest
Mar 12
ONT1:10 pmOntario
8h 05m
1 stop
IAD12:15 amWashington, D.C. Dulles Intl
Mar 17
IAD5:50 amWashington, D.C. Dulles Intl
7h 05m
1 stop
ONT9:55 amOntario
$264
Southwest
Mar 12
ONT1:10 pmOntario
8h 05m
1 stop
IAD12:15 amWashington, D.C. Dulles Intl
Mar 17
IAD4:45 pmWashington, D.C. Dulles Intl
8h 50m
2 stops
ONT10:35 pmOntario
$269

Alaska Airlines flights from Ontario to District of Columbia

Our best Alaska Airlines deals on Ontario to District of Columbia flight tickets
Alaska Airlines
Jan 29
ONT4:03 pmOntario
21h 23m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Feb 2
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 pmOntario
$287
Alaska Airlines
Jan 29
ONT6:00 amOntario
31h 26m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Feb 1
IAD6:04 pmWashington, D.C. Dulles Intl
19h 55m
1 stop
ONT10:59 amOntario
$297
Alaska Airlines
Feb 5
ONT6:00 amOntario
31h 26m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Feb 9
IAD6:04 pmWashington, D.C. Dulles Intl
29h 32m
1 stop
ONT8:36 pmOntario
$307

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to District of Columbia 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 January 11, 2026.
Use the filters below to find and compare flights from Ontario to District of Columbia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 1/29

6:20 am-4:59 pm

1 stop7h 39m

Washington, D.C. Reagan-National

Sun 2/1

6:00 pm-12:20 am

1 stop9h 20m

$138

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sun 2/1

6:20 am-1:02 pm

1 stop27h 42m

Washington, D.C. Reagan-National

Wed 2/4

8:59 am-3:07 pm

1 stop9h 08m

$141

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 2/5

6:20 am-4:59 pm

1 stop7h 39m

Washington, D.C. Reagan-National

Mon 2/9

6:00 pm-9:34 pm

1 stop30h 34m

$143

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 3/4

8:40 am-9:59 pm

1 stop10h 19m

Washington, D.C. Reagan-National

Tue 3/10

2:00 pm-11:59 pm

1 stop12h 59m

$149

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 3/18

6:15 am-4:59 pm

1 stop7h 44m

Washington, D.C. Reagan-National

Sat 4/4

6:00 pm-11:59 pm

1 stop8h 59m

$150

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 3/28

6:15 am-9:59 pm

1 stop12h 44m

Washington, D.C. Reagan-National

Wed 4/1

8:00 am-11:59 pm

1 stop18h 59m

$151

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 1/28

7:15 am-4:59 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Sun 2/1

6:00 pm-12:20 am

1 stop9h 20m

$158

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 3/12

1:10 pm-12:15 am

1 stop8h 05m

Washington, D.C. Dulles Intl

Tue 3/17

5:50 am-9:55 am

1 stop7h 05m

$264

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 3/12

1:10 pm-12:15 am

1 stop8h 05m

Washington, D.C. Dulles Intl

Tue 3/17

4:45 pm-10:35 pm

2 stops8h 50m

$269

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 1/29

4:03 pm-4:26 pm

1 stop21h 23m

Washington, D.C. Dulles Intl

Mon 2/2

6:04 pm-3:08 pm

1 stop24h 04m

$287

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 District of Columbia from

How to get the cheapest flight ticket from Ontario to District of Columbia

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 District of Columbia?

In general, September is the cheapest month to fly from Ontario to District of Columbia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $226. If you don’t want to visit District of Columbia in September, then you should wait until May to fly from Ontario, when ticket prices are also cheap, with an average price of $228.

What is the cheapest Ontario to District of Columbia flight route?

Fly from Ontario to Baltimore/Washington for the best Ontario - District of Columbia flight prices

How far in advance should I book a flight to District of Columbia?

You are more likely to see cheaper flights to District of Columbia from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to District of Columbia for around $444 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to District of Columbia from Ontario for as low as $297 on momondo.

What cabin class options are available on Ontario to District of Columbia flights?

There is only 1 cabin class available to choose from on Ontario to District of Columbia 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 District of Columbia flights?

You could potentially save up to 46% on your flight if you consider stops on a Ontario to District of Columbia flight.

Cheap Ontario to District of Columbia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to District of Columbia

Fastest flight time

6h 20m

Direct flights

None
The fastest flight from Ontario to District of Columbia takes 6h 20m
There are no direct flights from Ontario to District of Columbia. There are no popular flight routes from Ontario to District of Columbia.
Search flight deals

  • When did momondo last update prices for flights from Ontario Airport to District of Columbia?

    Prices for flights from Ontario Airport to District of Columbia refresh daily.

  • How many operators does momondo search for flights from Ontario Airport to District of Columbia?

  • How old do you have to be to fly from Ontario Airport to District of Columbia?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to District of Columbia.

  • What documentation or ID do you need to fly to District of Columbia?

    The travel and health documents required for your trip to District of Columbia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at District of Columbia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Ontario to District of Columbia

Compare and see reviews for airlines that fly from Ontario to District of Columbia with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $98Free CancellationRating
6.3
8,299 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.7
3,057 reviews
Search Frontier flights
DeltaPriceFrom $208Free CancellationRating
7.9
8,037 reviews
Search Delta flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,144 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,252 reviews
Search Southwest flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,099 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to District of Columbia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to District of Columbia. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to District of Columbia with flexible booking policies on momondo?

Yes. All flights to District of Columbia 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 District of Columbia?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to District of Columbia from Ontario.

I’m not ready to book a flight from Ontario to District of Columbia right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to District of Columbia from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your District of Columbia trip

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Find better results for your trip to District of Columbia

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