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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
8:45 am - 10:35 amONT-IAD
22h 50m1 stop
Frontier Logo
6:46 pm - 9:17 pmIAD-ONT
29h 31m2 stops
$229Frontier
Find Deal
Thu, Nov 27 - Mon, Dec 1
Frontier Logo
12:04 pm - 9:59 pmONT-DCA
6h 55m1 stop
Frontier Logo
6:00 pm - 11:59 pmDCA-ONT
8h 59m1 stop
$230Frontier
Find Deal
Thu, Dec 4 - Sun, Jan 4
Frontier Logo
6:15 am - 1:06 pmONT-DCA
27h 51m2 stops
Frontier Logo
8:00 am - 2:25 pmDCA-ONT
9h 25m1 stop
$233Frontier
Find Deal
Wed, Dec 3 - Mon, Dec 8
Frontier Logo
7:00 am - 9:59 pmONT-DCA
11h 59m1 stop
Frontier Logo
2:00 pm - 11:59 pmDCA-ONT
12h 59m1 stop
$234Frontier
Find Deal
Tue, Jan 20 - Thu, Jan 22
Multiple Airlines Logo
11:53 am - 4:26 pmONT-IAD
25h 33m1 stop
Multiple Airlines Logo
10:49 am - 6:12 pmIAD-ONT
10h 23m1 stop
$273Multiple Airlines
Find Deal
Tue, Jan 13 - Sun, Jan 18
Multiple Airlines Logo
7:00 am - 5:40 amONT-IAD
19h 40m2 stops
Multiple Airlines Logo
10:49 am - 6:01 pmIAD-ONT
10h 12m1 stop
$278Multiple Airlines
Find Deal
Thu, Feb 19 - Fri, Feb 27
Hawaiian Airlines Logo
7:33 pm - 4:36 pmONT-IAD
18h 03m1 stop
Hawaiian Airlines Logo
7:34 am - 6:33 pmIAD-ONT
13h 59m1 stop
$286Hawaiian Airlines
Find Deal
Thu, Dec 4 - Wed, Dec 10
Alaska Airlines Logo
6:00 am - 6:06 amONT-IAD
21h 06m1 stop
Alaska Airlines Logo
7:34 am - 6:33 pmIAD-ONT
13h 59m1 stop
$305Alaska Airlines
Find Deal
Thu, Dec 4 - Tue, Dec 9
Alaska Airlines Logo
6:00 am - 6:06 amONT-IAD
21h 06m1 stop
Alaska Airlines Logo
6:30 pm - 11:19 amIAD-ONT
19h 49m1 stop
$306Alaska Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
Delta Logo
6:40 am - 11:27 pmONT-IAD
13h 47m1 stop
Delta Logo
7:30 am - 10:29 pmIAD-ONT
17h 59m1 stop
$307Delta
Find Deal
Tue, Dec 16 - Wed, Jan 14

United Airlines flights from Ontario to District of Columbia

Our best United Airlines deals on Ontario to District of Columbia flight tickets
United Airlines
Dec 10
ONT1:50 pmOntario
8h 06m
1 stop
IAD12:56 amWashington, D.C. Dulles Intl
Dec 17
IAD6:30 amWashington, D.C. Dulles Intl
8h 47m
1 stop
ONT12:17 pmOntario
$358
Find similar
United Airlines
Nov 24
ONT1:40 pmOntario
8h 16m
1 stop
IAD12:56 amWashington, D.C. Dulles Intl
Dec 2
IAD2:30 pmWashington, D.C. Dulles Intl
9h 12m
1 stop
ONT8:42 pmOntario
$369
Find similar
United Airlines
Nov 24
ONT1:40 pmOntario
8h 16m
1 stop
IAD12:56 amWashington, D.C. Dulles Intl
Dec 3
IAD4:10 pmWashington, D.C. Dulles Intl
9h 39m
1 stop
ONT10:49 pmOntario
$433
Find similar

Delta flights from Ontario to District of Columbia

Our best Delta deals on Ontario to District of Columbia flight tickets
Delta
Dec 16
ONT6:40 amOntario
13h 47m
1 stop
IAD11:27 pmWashington, D.C. Dulles Intl
Jan 12
IAD7:30 amWashington, D.C. Dulles Intl
9h 26m
1 stop
ONT1:56 pmOntario
$307
Find similar
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
9h 26m
1 stop
ONT1:56 pmOntario
$312
Find similar
Delta
Feb 20
ONT10:20 pmOntario
8h 37m
1 stop
IAD9:57 amWashington, D.C. Dulles Intl
Feb 24
IAD7:30 amWashington, D.C. Dulles Intl
18h 10m
1 stop
ONT10:40 pmOntario
$313
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 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 - IAD

ONTIAD

Ontario

Thu 11/27

8:45 am-10:35 am

1 stop22h 50m

Washington, D.C. Dulles Intl

Mon 12/1

6:46 pm-9:17 pm

2 stops29h 31m

$229

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 12/4

12:04 pm-9:59 pm

1 stop6h 55m

Washington, D.C. Reagan-National

Sun 1/4

6:00 pm-11:59 pm

1 stop8h 59m

$230

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 12/3

6:15 am-1:06 pm

2 stops27h 51m

Washington, D.C. Reagan-National

Mon 12/8

8:00 am-2:25 pm

1 stop9h 25m

$233

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 1/20

7:00 am-9:59 pm

1 stop11h 59m

Washington, D.C. Reagan-National

Thu 1/22

2:00 pm-11:59 pm

1 stop12h 59m

$234

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 1/13

11:53 am-4:26 pm

1 stop25h 33m

Washington, D.C. Dulles Intl

Sun 1/18

10:49 am-6:12 pm

1 stop10h 23m

$273

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 2/19

7:00 am-5:40 am

2 stops19h 40m

Washington, D.C. Dulles Intl

Fri 2/27

10:49 am-6:01 pm

1 stop10h 12m

$278

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 12/4

7:33 pm-4:36 pm

1 stop18h 03m

Washington, D.C. Dulles Intl

Wed 12/10

7:34 am-6:33 pm

1 stop13h 59m

$286

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 12/4

6:00 am-6:06 am

1 stop21h 06m

Washington, D.C. Dulles Intl

Tue 12/9

7:34 am-6:33 pm

1 stop13h 59m

$305

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 12/4

6:00 am-6:06 am

1 stop21h 06m

Washington, D.C. Dulles Intl

Mon 12/8

6:30 pm-11:19 am

1 stop19h 49m

$306

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 12/16

6:40 am-11:27 pm

1 stop13h 47m

Washington, D.C. Dulles Intl

Wed 1/14

7:30 am-10:29 pm

1 stop17h 59m

$307

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
8,139 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.8
3,114 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,236 reviews
Search Southwest flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
DeltaPriceFrom $284Free CancellationRating
7.9
8,007 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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