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Cheap flights from Ontario to District of Columbia 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 District of Columbia departing on 11/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
6:53 am - 4:59 pmONT-DCA
7h 06m1 stop
Frontier Logo
6:00 pm - 11:50 pmDCA-ONT
8h 50m1 stop
$192Frontier
Find Deal
Sat, Nov 8 - Sat, Nov 15
Frontier Logo
8:00 am - 1:04 pmONT-DCA
26h 04m2 stops
Frontier Logo
2:00 pm - 11:50 pmDCA-ONT
12h 50m1 stop
$195Frontier
Find Deal
Tue, Oct 28 - Sat, Nov 1
American Airlines Logo
11:05 am - 12:40 amONT-DCA
10h 35m1 stop
American Airlines Logo
5:00 am - 1:44 pmDCA-ONT
11h 44m1 stop
$305American Airlines
Find Deal
Sat, Feb 14 - Tue, Feb 17
American Airlines Logo
9:53 am - 8:07 pmONT-DCA
7h 14m1 stop
American Airlines Logo
6:30 am - 6:16 pmDCA-ONT
14h 46m1 stop
$312American Airlines
Find Deal
Wed, Dec 24 - Wed, Dec 31
United Airlines Logo
6:00 am - 4:27 pmONT-IAD
7h 27m1 stop
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
$314United Airlines
Find Deal
Tue, Nov 4 - Sat, Nov 8
Delta Logo
11:36 am - 9:43 pmONT-DCA
7h 07m1 stop
Delta Logo
6:00 am - 10:26 amDCA-ONT
7h 26m1 stop
$319Delta
Find Deal
Fri, Oct 31 - Tue, Nov 4
Delta Logo
11:36 am - 11:18 pmONT-IAD
8h 42m1 stop
Delta Logo
7:10 am - 12:18 pmIAD-ONT
8h 08m1 stop
$319Delta
Find Deal
Fri, Oct 31 - Tue, Nov 11
United Airlines Logo
5:05 am - 4:30 pmONT-IAD
8h 25m1 stop
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
$363United Airlines
Find Deal
Fri, Nov 7 - Mon, Nov 10
Southwest Logo
8:30 am - 7:05 pmONT-IAD
7h 35m1 stop
Southwest Logo
5:05 am - 1:35 pmIAD-ONT
11h 30m2 stops
$364Southwest
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Mon, Nov 10 - Thu, Nov 13
Southwest Logo
12:20 pm - 11:25 pmONT-IAD
8h 05m1 stop
Southwest Logo
5:45 pm - 10:05 pmIAD-ONT
7h 20m1 stop
$399Southwest
Find Deal
Mon, Dec 22 - Wed, Dec 31

United Airlines flights from Ontario to District of Columbia

Our best United Airlines deals on Ontario to District of Columbia flight tickets
United Airlines
Nov 4
ONT6:00 amOntario
7h 27m
1 stop
IAD4:27 pmWashington, D.C. Dulles Intl
Nov 8
IAD4:10 pmWashington, D.C. Dulles Intl
9h 41m
1 stop
ONT10:51 pmOntario
$314
Find similar
United Airlines
Nov 7
ONT5:05 amOntario
8h 25m
1 stop
IAD4:30 pmWashington, D.C. Dulles Intl
Nov 10
IAD4:10 pmWashington, D.C. Dulles Intl
9h 41m
1 stop
ONT10:51 pmOntario
$363
Find similar
United Airlines
Nov 5
ONT5:05 amOntario
7h 36m
1 stop
IAD3:41 pmWashington, D.C. Dulles Intl
Nov 11
IAD4:10 pmWashington, D.C. Dulles Intl
9h 41m
1 stop
ONT10:51 pmOntario
$414
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
Nov 3
ONT6:11 pmOntario
9h 12m
1 stop
IAD6:23 amWashington, D.C. Dulles Intl
Nov 5
IAD7:43 amWashington, D.C. Dulles Intl
10h 34m
1 stop
ONT3:17 pmOntario
$318
Find similar
Alaska Airlines
Nov 14
ONT4:11 pmOntario
11h 12m
1 stop
IAD6:23 amWashington, D.C. Dulles Intl
Nov 17
IAD7:43 amWashington, D.C. Dulles Intl
10h 34m
1 stop
ONT3:17 pmOntario
$326
Find similar
Alaska Airlines
Dec 25
ONT6:00 amOntario
9h 09m
1 stop
IAD6:09 pmWashington, D.C. Dulles Intl
Dec 31
IAD7:33 amWashington, D.C. Dulles Intl
11h 09m
1 stop
ONT3:42 pmOntario
$367
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 October 13, 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

Sat 11/8

6:53 am-4:59 pm

1 stop7h 06m

Washington, D.C. Reagan-National

Sat 11/15

6:00 pm-11:50 pm

1 stop8h 50m

$192

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 10/28

8:00 am-1:04 pm

2 stops26h 04m

Washington, D.C. Reagan-National

Sat 11/1

2:00 pm-11:50 pm

1 stop12h 50m

$195

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 2/14

11:05 am-12:40 am

1 stop10h 35m

Washington, D.C. Reagan-National

Tue 2/17

5:00 am-1:44 pm

1 stop11h 44m

$305

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 12/24

9:53 am-8:07 pm

1 stop7h 14m

Washington, D.C. Reagan-National

Wed 12/31

6:30 am-6:16 pm

1 stop14h 46m

$312

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 11/4

6:00 am-4:27 pm

1 stop7h 27m

Washington, D.C. Dulles Intl

Sat 11/8

4:10 pm-10:51 pm

1 stop9h 41m

$314

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 10/31

11:36 am-9:43 pm

1 stop7h 07m

Washington, D.C. Reagan-National

Tue 11/4

6:00 am-10:26 am

1 stop7h 26m

$319

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 10/31

11:36 am-11:18 pm

1 stop8h 42m

Washington, D.C. Dulles Intl

Tue 11/11

7:10 am-12:18 pm

1 stop8h 08m

$319

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 11/7

5:05 am-4:30 pm

1 stop8h 25m

Washington, D.C. Dulles Intl

Mon 11/10

4:10 pm-10:51 pm

1 stop9h 41m

$363

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 11/10

8:30 am-7:05 pm

1 stop7h 35m

Washington, D.C. Dulles Intl

Thu 11/13

5:05 am-1:35 pm

2 stops11h 30m

$364

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 12/22

12:20 pm-11:25 pm

1 stop8h 05m

Washington, D.C. Dulles Intl

Wed 12/31

5:45 pm-10:05 pm

1 stop7h 20m

$399

Flights are sorted by cheapest round-trip flights 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 $443 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.
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  • 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
8,092 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.8
3,135 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
8,973 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,235 reviews
Search Southwest flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,044 reviews
Search American Airlines flights
DeltaPriceFrom $284Free CancellationRating
7.9
7,973 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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