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Cheap flights from Ontario to District of Columbia from $65

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 1/15. 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
12:04 pm - 9:59 pmONT-DCA
6h 55m1 stop
Frontier Logo
8:00 am - 2:25 pmDCA-ONT
9h 25m1 stop
$252Frontier
Find Deal
Thu, Dec 11 - Mon, Dec 15
Frontier Logo
6:45 am - 9:59 pmONT-DCA
12h 14m1 stop
Frontier Logo
2:00 pm - 11:59 pmDCA-ONT
12h 59m1 stop
$253Frontier
Find Deal
Fri, Dec 19 - Wed, Dec 31
Frontier Logo
6:45 am - 1:01 pmONT-DCA
27h 16m1 stop
Frontier Logo
6:00 pm - 11:59 pmDCA-ONT
8h 59m1 stop
$261Frontier
Find Deal
Sat, Dec 20 - Thu, Jan 1
Frontier Logo
6:45 am - 1:01 pmONT-DCA
27h 16m1 stop
Frontier Logo
6:00 pm - 11:14 pmDCA-ONT
8h 14m1 stop
$263Frontier
Find Deal
Tue, Dec 23 - Sat, Jan 10
Frontier Logo
12:23 pm - 9:59 pmONT-DCA
6h 36m1 stop
Frontier Logo
2:00 pm - 2:25 pmDCA-ONT
27h 25m1 stop
$264Frontier
Find Deal
Thu, Nov 27 - Thu, Dec 4
Delta Logo
7:30 am - 11:37 pmONT-IAD
13h 07m2 stops
Delta Logo
7:30 am - 4:15 pmIAD-ONT
11h 45m2 stops
$298Delta
Find Deal
Tue, Jan 13 - Tue, Jan 20
Alaska Airlines Logo
4:03 pm - 4:26 pmONT-IAD
21h 23m1 stop
Alaska Airlines Logo
6:04 pm - 3:08 pmIAD-ONT
24h 04m1 stop
$304Alaska Airlines
Find Deal
Wed, Jan 21 - Fri, Jan 23
Alaska Airlines Logo
11:53 am - 4:26 pmONT-IAD
25h 33m1 stop
Alaska Airlines Logo
6:04 pm - 3:08 pmIAD-ONT
24h 04m1 stop
$306Alaska Airlines
Find Deal
Tue, Jan 13 - Tue, Jan 20
Delta Logo
3:30 pm - 11:10 pmONT-IAD
28h 40m1 stop
Delta Logo
7:30 am - 10:40 pmIAD-ONT
18h 10m1 stop
$307Delta
Find Deal
Fri, Feb 20 - Tue, Feb 24
American Airlines Logo
6:10 am - 4:28 pmONT-IAD
7h 18m1 stop
American Airlines Logo
3:11 pm - 7:57 pmIAD-ONT
7h 46m1 stop
$319American Airlines
Find Deal
Sat, Feb 14 - Tue, Feb 17

Delta flights from Ontario to District of Columbia

Our best Delta deals on Ontario to District of Columbia flight tickets
Delta
Jan 13
ONT7:30 amOntario
13h 07m
2 stops
IAD11:37 pmWashington, D.C. Dulles Intl
Jan 20
IAD7:30 amWashington, D.C. Dulles Intl
11h 45m
2 stops
ONT4:15 pmOntario
$298
Find similar
Delta
Feb 20
ONT3:30 pmOntario
28h 40m
1 stop
IAD11:10 pmWashington, D.C. Dulles Intl
Feb 24
IAD7:30 amWashington, D.C. Dulles Intl
18h 10m
1 stop
ONT10:40 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
11h 45m
2 stops
ONT4:15 pmOntario
$318
Find similar

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 21
ONT4:03 pmOntario
21h 23m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Jan 23
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 pmOntario
$304
Find similar
Alaska Airlines
Jan 13
ONT11:53 amOntario
25h 33m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Jan 20
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 pmOntario
$306
Find similar
Alaska Airlines
Feb 25
ONT12:02 pmOntario
26h 18m
1 stop
IAD5:20 pmWashington, D.C. Dulles Intl
Mar 1
IAD7:05 amWashington, D.C. Dulles Intl
19h 27m
1 stop
ONT11:32 pmOntario
$325
Find similar

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 November 18, 2025.
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 12/11

12:04 pm-9:59 pm

1 stop6h 55m

Washington, D.C. Reagan-National

Mon 12/15

8:00 am-2:25 pm

1 stop9h 25m

$252

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 12/19

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

Wed 12/31

2:00 pm-11:59 pm

1 stop12h 59m

$253

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 12/20

6:45 am-1:01 pm

1 stop27h 16m

Washington, D.C. Reagan-National

Thu 1/1

6:00 pm-11:59 pm

1 stop8h 59m

$261

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 12/23

6:45 am-1:01 pm

1 stop27h 16m

Washington, D.C. Reagan-National

Sat 1/10

6:00 pm-11:14 pm

1 stop8h 14m

$263

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 11/27

12:23 pm-9:59 pm

1 stop6h 36m

Washington, D.C. Reagan-National

Thu 12/4

2:00 pm-2:25 pm

1 stop27h 25m

$264

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/13

7:30 am-11:37 pm

2 stops13h 07m

Washington, D.C. Dulles Intl

Tue 1/20

7:30 am-4:15 pm

2 stops11h 45m

$298

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 1/21

4:03 pm-4:26 pm

1 stop21h 23m

Washington, D.C. Dulles Intl

Fri 1/23

6:04 pm-3:08 pm

1 stop24h 04m

$304

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-3:08 pm

1 stop24h 04m

$306

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 2/20

3:30 pm-11:10 pm

1 stop28h 40m

Washington, D.C. Dulles Intl

Tue 2/24

7:30 am-10:40 pm

1 stop18h 10m

$307

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 2/14

6:10 am-4:28 pm

1 stop7h 18m

Washington, D.C. Dulles Intl

Tue 2/17

3:11 pm-7:57 pm

1 stop7h 46m

$319

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 day to depart on your flight to District of Columbia?

The cheapest day to depart on your flight to District of Columbia is on a Wednesday when prices can be found for as low as $314. This is often the case because there is less demand to fly during this day of the week. On the other hand, Sunday is the most expensive day to depart from Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $492.

What is the cheapest time of day to depart on your flight to District of Columbia?

Flying to District of Columbia from Ontario in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $288 when looking at flights departing in the afternoon. Flights to District of Columbia are more costly at noon, with an average ticket price of $423. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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 $455 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.

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

Direct flights

None
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
8,146 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.8
3,103 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,245 reviews
Search Southwest flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
DeltaPriceFrom $284Free CancellationRating
7.9
8,008 reviews
Search Delta 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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