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Cheap flights from Ontario to District of Columbia 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 District of Columbia departing on 1/13. 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
6:00 am - 9:59 pm
ONT
-
DCA
12h 59m1 stop
Frontier Logo
2:00 pm - 11:59 pm
DCA
-
ONT
12h 59m1 stop
$141Frontier
Sat, Feb 21 - Sat, Feb 28
Frontier Logo
6:00 am - 1:15 pm
ONT
-
DCA
28h 15m1 stop
Frontier Logo
8:00 am - 9:34 am
DCA
-
ONT
28h 34m1 stop
$148Frontier
Sat, Feb 21 - Wed, Feb 25
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
$159Frontier
Sat, Jan 31 - Mon, Feb 2
Frontier Logo
7:15 am - 9:59 pm
ONT
-
DCA
11h 44m1 stop
Frontier Logo
8:59 am - 3:07 pm
DCA
-
ONT
9h 08m1 stop
$165Frontier
Wed, Jan 14 - Wed, Jan 21
Frontier Logo
6:10 am - 9:59 pm
ONT
-
DCA
12h 49m1 stop
Frontier Logo
8:00 am - 9:34 am
DCA
-
ONT
28h 34m1 stop
$167Frontier
Mon, Feb 23 - Wed, Feb 25
Frontier Logo
6:20 am - 4:59 pm
ONT
-
DCA
7h 39m1 stop
Frontier Logo
2:00 pm - 11:24 pm
DCA
-
ONT
12h 24m1 stop
$168Frontier
Sun, Jan 25 - Sat, Feb 7
Alaska Airlines Logo
4:03 pm - 4:26 pm
ONT
-
IAD
21h 23m1 stop
Alaska Airlines Logo
7:05 am - 11:32 pm
IAD
-
ONT
19h 27m1 stop
$306Alaska Airlines
Tue, Jan 27 - Sat, Feb 28
Delta Logo
10:30 pm - 9:13 am
ONT
-
IAD
7h 43m1 stop
Delta Logo
3:42 pm - 9:05 pm
IAD
-
ONT
8h 23m1 stop
$319Delta
Thu, Jan 22 - Mon, Jan 26
Alaska Airlines Logo
6:00 am - 4:26 pm
ONT
-
IAD
31h 26m1 stop
Alaska Airlines Logo
6:04 pm - 3:08 pm
IAD
-
ONT
24h 04m1 stop
$326Alaska Airlines
Fri, Jan 30 - Thu, Feb 5
Alaska Airlines Logo
4:03 pm - 4:26 pm
ONT
-
IAD
21h 23m1 stop
Alaska Airlines Logo
6:04 pm - 8:36 pm
IAD
-
ONT
29h 32m1 stop
$327Alaska Airlines
Fri, Jan 23 - Tue, Feb 3

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
ONT6:00 amOntario
31h 26m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Feb 4
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 pmOntario
$306
Find similar
Alaska Airlines
Jan 30
ONT6:00 amOntario
31h 26m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Feb 5
IAD6:04 pmWashington, D.C. Dulles Intl
24h 04m
1 stop
ONT3:08 pmOntario
$326
Find similar
Alaska Airlines
Jan 23
ONT4:03 pmOntario
21h 23m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
Feb 3
IAD6:04 pmWashington, D.C. Dulles Intl
29h 32m
1 stop
ONT8:36 pmOntario
$327
Find similar

United Airlines flights from Ontario to District of Columbia

Our best United Airlines deals on Ontario to District of Columbia flight tickets
United Airlines
Jan 27
ONT6:00 amOntario
7h 45m
1 stop
IAD4:45 pmWashington, D.C. Dulles Intl
Jan 28
IAD2:24 pmWashington, D.C. Dulles Intl
9h 34m
1 stop
ONT8:58 pmOntario
$419
Find similar
United Airlines
Jan 9
ONT5:05 amOntario
23h 25m
2 stops
IAD7:30 amWashington, D.C. Dulles Intl
Jan 11
IAD10:20 pmWashington, D.C. Dulles Intl
25h 38m
2 stops
ONT8:58 pmOntario
$570
Find similar
United Airlines
Jan 9
ONT5:05 amOntario
23h 25m
2 stops
IAD7:30 amWashington, D.C. Dulles Intl
Jan 11
IAD10:20 pmWashington, D.C. Dulles Intl
26h 38m
2 stops
ONT9:58 pmOntario
$620
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 December 28, 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 2/21

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Sat 2/28

2:00 pm-11:59 pm

1 stop12h 59m

$141

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 2/21

6:00 am-1:15 pm

1 stop28h 15m

Washington, D.C. Reagan-National

Wed 2/25

8:00 am-9:34 am

1 stop28h 34m

$148

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 1/31

7:15 am-9:59 pm

1 stop11h 44m

Washington, D.C. Reagan-National

Mon 2/2

2:00 pm-12:20 am

1 stop13h 20m

$159

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 1/14

7:15 am-9:59 pm

1 stop11h 44m

Washington, D.C. Reagan-National

Wed 1/21

8:59 am-3:07 pm

1 stop9h 08m

$165

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 2/23

6:10 am-9:59 pm

1 stop12h 49m

Washington, D.C. Reagan-National

Wed 2/25

8:00 am-9:34 am

1 stop28h 34m

$167

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sun 1/25

6:20 am-4:59 pm

1 stop7h 39m

Washington, D.C. Reagan-National

Sat 2/7

2:00 pm-11:24 pm

1 stop12h 24m

$168

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/27

4:03 pm-4:26 pm

1 stop21h 23m

Washington, D.C. Dulles Intl

Sat 2/28

7:05 am-11:32 pm

1 stop19h 27m

$306

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 1/22

10:30 pm-9:13 am

1 stop7h 43m

Washington, D.C. Dulles Intl

Mon 1/26

3:42 pm-9:05 pm

1 stop8h 23m

$319

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 1/30

6:00 am-4:26 pm

1 stop31h 26m

Washington, D.C. Dulles Intl

Thu 2/5

6:04 pm-3:08 pm

1 stop24h 04m

$326

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 1/23

4:03 pm-4:26 pm

1 stop21h 23m

Washington, D.C. Dulles Intl

Tue 2/3

6:04 pm-8:36 pm

1 stop29h 32m

$327

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 $451 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 37m

Direct flights

None
The fastest flight from Ontario to District of Columbia takes 6h 37m
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
8,210 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.7
3,064 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,114 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,256 reviews
Search Southwest flights
DeltaPriceFrom $276Free CancellationRating
7.9
8,017 reviews
Search Delta flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,070 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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