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Cheap flights from Ontario to District of Columbia from $85

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 10/22. 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

Frontier Logo
4:08 pm - 12:02 pmONT-IAD
16h 54m2 stops
Frontier Logo
10:17 am - 6:15 pmIAD-ONT
10h 58m1 stop
$228Frontier
Find Deal
Fri, Sep 26 - Sun, Sep 28
Frontier Logo
8:59 pm - 4:59 pmONT-DCA
17h 00m1 stop
Frontier Logo
7:00 am - 7:23 amDCA-ONT
27h 23m1 stop
$232Frontier
Find Deal
Mon, Sep 22 - Wed, Sep 24
Southwest Logo
2:15 pm - 11:30 pmONT-IAD
6h 15m1 stop
Southwest Logo
6:40 pm - 10:45 pmIAD-ONT
7h 05m1 stop
$254Southwest
Find Deal
Fri, Oct 24 - Wed, Oct 29
Southwest Logo
12:55 pm - 11:45 pmONT-DCA
7h 50m1 stop
Southwest Logo
9:05 am - 1:30 pmDCA-ONT
7h 25m1 stop
$269Southwest
Find Deal
Fri, Oct 24 - Wed, Oct 29
Delta Logo
10:30 pm - 9:14 amONT-DCA
7h 44m1 stop
Delta Logo
7:00 am - 11:38 amDCA-ONT
7h 38m1 stop
$277Delta
Find Deal
Sat, Feb 14 - Sat, Feb 21
Delta Logo
1:20 pm - 11:29 pmONT-IAD
7h 09m1 stop
Delta Logo
7:10 am - 12:18 pmIAD-ONT
8h 08m1 stop
$277Delta
Find Deal
Tue, Nov 11 - Thu, Nov 13
United Airlines Logo
6:00 am - 6:39 pmONT-DCA
9h 39m1 stop
United Airlines Logo
7:00 am - 12:13 pmDCA-ONT
8h 13m1 stop
$293United Airlines
Find Deal
Wed, Oct 8 - Sun, Oct 12
American Airlines Logo
11:59 pm - 10:57 amONT-IAD
7h 58m1 stop
American Airlines Logo
2:18 pm - 9:36 pmIAD-ONT
10h 18m1 stop
$308American Airlines
Find Deal
Thu, Oct 2 - Tue, Oct 7
American Airlines Logo
11:59 pm - 10:57 amONT-IAD
7h 58m1 stop
American Airlines Logo
5:54 pm - 11:59 pmIAD-ONT
9h 05m1 stop
$309American Airlines
Find Deal
Thu, Oct 2 - Mon, Oct 6
United Airlines Logo
9:36 am - 9:10 pmONT-IAD
8h 34m1 stop
United Airlines Logo
6:30 am - 12:13 pmIAD-ONT
8h 43m1 stop
$329United Airlines
Find Deal
Wed, Oct 8 - Wed, Oct 15

Alaska Airlines flights from Ontario to District of Columbia

Our best Alaska Airlines deals on Ontario to District of Columbia flight tickets
Alaska Airlines
Oct 20
ONT7:43 pmOntario
8h 50m
1 stop
IAD7:33 amWashington, D.C. Dulles Intl
Oct 22
IAD6:25 amWashington, D.C. Dulles Intl
9h 12m
1 stop
ONT12:37 pmOntario
$289
Find similar
Alaska Airlines
Oct 29
ONT4:11 pmOntario
11h 12m
1 stop
IAD6:23 amWashington, D.C. Dulles Intl
Nov 1
IAD7:43 amWashington, D.C. Dulles Intl
10h 34m
1 stop
ONT3:17 pmOntario
$302
Find similar
Alaska Airlines
Oct 3
ONT7:47 pmOntario
8h 46m
1 stop
IAD7:33 amWashington, D.C. Dulles Intl
Oct 7
IAD6:25 amWashington, D.C. Dulles Intl
9h 12m
1 stop
ONT12:37 pmOntario
$305
Find similar

American Airlines flights from Ontario to District of Columbia

Our best American Airlines deals on Ontario to District of Columbia flight tickets
American Airlines
Oct 2
ONT11:59 pmOntario
7h 58m
1 stop
IAD10:57 amWashington, D.C. Dulles Intl
Oct 7
IAD2:18 pmWashington, D.C. Dulles Intl
10h 18m
1 stop
ONT9:36 pmOntario
$308
Find similar
American Airlines
Oct 2
ONT11:59 pmOntario
7h 58m
1 stop
IAD10:57 amWashington, D.C. Dulles Intl
Oct 6
IAD5:54 pmWashington, D.C. Dulles Intl
9h 05m
1 stop
ONT11:59 pmOntario
$309
Find similar
American Airlines
Oct 2
ONT11:59 pmOntario
10h 52m
2 stops
IAD1:51 pmWashington, D.C. Dulles Intl
Oct 6
IAD5:54 pmWashington, D.C. Dulles Intl
9h 05m
1 stop
ONT11:59 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 September 11, 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

Fri 9/26

4:08 pm-12:02 pm

2 stops16h 54m

Washington, D.C. Dulles Intl

Sun 9/28

10:17 am-6:15 pm

1 stop10h 58m

$228

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 9/22

8:59 pm-4:59 pm

1 stop17h 00m

Washington, D.C. Reagan-National

Wed 9/24

7:00 am-7:23 am

1 stop27h 23m

$232

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 10/24

2:15 pm-11:30 pm

1 stop6h 15m

Washington, D.C. Dulles Intl

Wed 10/29

6:40 pm-10:45 pm

1 stop7h 05m

$254

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 10/24

12:55 pm-11:45 pm

1 stop7h 50m

Washington, D.C. Reagan-National

Wed 10/29

9:05 am-1:30 pm

1 stop7h 25m

$269

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 2/14

10:30 pm-9:14 am

1 stop7h 44m

Washington, D.C. Reagan-National

Sat 2/21

7:00 am-11:38 am

1 stop7h 38m

$277

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 11/11

1:20 pm-11:29 pm

1 stop7h 09m

Washington, D.C. Dulles Intl

Thu 11/13

7:10 am-12:18 pm

1 stop8h 08m

$277

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 10/8

6:00 am-6:39 pm

1 stop9h 39m

Washington, D.C. Reagan-National

Sun 10/12

7:00 am-12:13 pm

1 stop8h 13m

$293

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 10/2

11:59 pm-10:57 am

1 stop7h 58m

Washington, D.C. Dulles Intl

Tue 10/7

2:18 pm-9:36 pm

1 stop10h 18m

$308

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 10/2

11:59 pm-10:57 am

1 stop7h 58m

Washington, D.C. Dulles Intl

Mon 10/6

5:54 pm-11:59 pm

1 stop9h 05m

$309

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 10/8

9:36 am-9:10 pm

1 stop8h 34m

Washington, D.C. Dulles Intl

Wed 10/15

6:30 am-12:13 pm

1 stop8h 43m

$329

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, May 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 $228. If you don’t want to visit District of Columbia in May, then you should wait until August to fly from Ontario, when ticket prices are also cheap, with an average price of $262.

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 $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.

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
8,023 reviews
Search Spirit Airlines flights
FrontierPriceFrom $147Free CancellationRating
5.8
3,177 reviews
Search Frontier flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
SouthwestPriceFrom $258Free CancellationRating
8.0
4,248 reviews
Search Southwest flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $284Free CancellationRating
7.9
7,960 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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Find better results for your trip to District of Columbia

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