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Cheap flights from Washington, D.C. to Los Angeles from $60

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Los Angeles departing on 3/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Washington, D.C. to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:00 am - 9:34 pm
DCA
-
ONT
16h 34m
1 stop
Frontier Logo
7:30 am - 1:15 pm
ONT
-
DCA
26h 45m
1 stop
$148Frontier
Tue, Feb 10 - Wed, Feb 18
Frontier Logo
8:00 am - 9:34 pm
DCA
-
ONT
16h 34m
1 stop
Frontier Logo
7:30 am - 1:15 pm
ONT
-
DCA
26h 45m
1 stop
$149Frontier
Tue, Feb 10 - Wed, Feb 18
Frontier Logo
2:00 pm - 9:34 pm
DCA
-
ONT
10h 34m
1 stop
Frontier Logo
6:10 am - 4:59 pm
ONT
-
DCA
7h 49m
1 stop
$150Frontier
Tue, Feb 10 - Sun, Feb 15
Frontier Logo
2:00 pm - 9:34 pm
DCA
-
ONT
10h 34m
1 stop
Frontier Logo
7:30 am - 1:15 pm
ONT
-
DCA
26h 45m
1 stop
$159Frontier
Tue, Feb 10 - Wed, Feb 18
Frontier Logo
2:00 pm - 9:34 pm
DCA
-
ONT
10h 34m
1 stop
Frontier Logo
6:43 pm - 1:15 pm
ONT
-
DCA
15h 32m
2 stops
$160Frontier
Wed, Feb 18 - Mon, Feb 23
Multiple Airlines Logo
7:50 pm - 7:26 am
BWI
-
ONT
14h 36m
1 stop
Multiple Airlines Logo
1:18 pm - 10:27 am
ONT
-
BWI
18h 09m
1 stop
$214Multiple Airlines
Fri, Feb 20 - Mon, Feb 23
Multiple Airlines Logo
7:57 pm - 12:23 pm
BWI
-
ONT
19h 26m
1 stop
Multiple Airlines Logo
8:21 am - 11:22 am
ONT
-
BWI
24h 01m
1 stop
$247Multiple Airlines
Thu, Feb 12 - Sat, Feb 14
Delta Logo
7:15 am - 12:02 pm
IAD
-
ONT
7h 47m
1 stop
Delta Logo
1:15 pm - 12:21 am
ONT
-
IAD
8h 06m
1 stop
$296Delta
Sat, Feb 21 - Sat, Feb 28
Delta Logo
3:35 pm - 9:00 pm
IAD
-
ONT
8h 25m
1 stop
Delta Logo
10:15 pm - 9:15 am
ONT
-
IAD
8h 00m
1 stop
$297Delta
Tue, Apr 7 - Tue, Apr 14
American Airlines Logo
6:00 am - 1:49 pm
IAD
-
ONT
10h 49m
1 stop
American Airlines Logo
10:37 pm - 8:48 am
ONT
-
IAD
7h 11m
1 stop
$305American Airlines
Sat, Feb 21 - Sat, Feb 21

Frontier flights from Washington, D.C. to Ontario

Our best Frontier deals on Washington, D.C. to Ontario flight tickets
Frontier
Feb 10
DCA8:00 amWashington, D.C. Reagan-National
16h 34m
1 stop
ONT9:34 pmOntario
Feb 18
ONT7:30 amOntario
26h 45m
1 stop
DCA1:15 pmWashington, D.C. Reagan-National
$148
Frontier
Feb 10
DCA8:00 amWashington, D.C. Reagan-National
16h 34m
1 stop
ONT9:34 pmOntario
Feb 18
ONT7:30 amOntario
26h 45m
1 stop
DCA1:15 pmWashington, D.C. Reagan-National
$149
Frontier
Feb 10
DCA2:00 pmWashington, D.C. Reagan-National
10h 34m
1 stop
ONT9:34 pmOntario
Feb 15
ONT6:10 amOntario
7h 49m
1 stop
DCA4:59 pmWashington, D.C. Reagan-National
$150

American Airlines flights from Washington, D.C. to Ontario

Our best American Airlines deals on Washington, D.C. to Ontario flight tickets
American Airlines
Feb 21
IAD6:00 amWashington, D.C. Dulles Intl
10h 49m
1 stop
ONT1:49 pmOntario
Feb 21
ONT10:37 pmOntario
7h 11m
1 stop
IAD8:48 amWashington, D.C. Dulles Intl
$305
American Airlines
Feb 17
IAD5:00 amWashington, D.C. Dulles Intl
9h 28m
2 stops
ONT11:28 amOntario
Feb 23
ONT11:58 pmOntario
11h 41m
2 stops
IAD2:39 pmWashington, D.C. Dulles Intl
$318
American Airlines
Mar 2
IAD4:46 pmWashington, D.C. Dulles Intl
7h 38m
1 stop
ONT9:24 pmOntario
Mar 7
ONT9:52 pmOntario
6h 56m
1 stop
IAD7:48 amWashington, D.C. Dulles Intl
$325

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Ontario 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 January 20, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 2/10

8:00 am-9:34 pm

1 stop16h 34m

Ontario

Wed 2/18

7:30 am-1:15 pm

1 stop26h 45m

$148

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 2/10

8:00 am-9:34 pm

1 stop16h 34m

Ontario

Wed 2/18

7:30 am-1:15 pm

1 stop26h 45m

$149

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 2/10

2:00 pm-9:34 pm

1 stop10h 34m

Ontario

Sun 2/15

6:10 am-4:59 pm

1 stop7h 49m

$150

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 2/10

2:00 pm-9:34 pm

1 stop10h 34m

Ontario

Wed 2/18

7:30 am-1:15 pm

1 stop26h 45m

$159

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 2/18

2:00 pm-9:34 pm

1 stop10h 34m

Ontario

Mon 2/23

6:43 pm-1:15 pm

2 stops15h 32m

$160

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Fri 2/20

7:50 pm-7:26 am

1 stop14h 36m

Ontario

Mon 2/23

1:18 pm-10:27 am

1 stop18h 09m

$214

BaltimoreOntario

BWI - ONT

BWIONT

Baltimore/Washington

Thu 2/12

7:57 pm-12:23 pm

1 stop19h 26m

Ontario

Sat 2/14

8:21 am-11:22 am

1 stop24h 01m

$247

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sat 2/21

7:15 am-12:02 pm

1 stop7h 47m

Ontario

Sat 2/28

1:15 pm-12:21 am

1 stop8h 06m

$296

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 4/7

3:35 pm-9:00 pm

1 stop8h 25m

Ontario

Tue 4/14

10:15 pm-9:15 am

1 stop8h 00m

$297

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sat 2/21

6:00 am-1:49 pm

1 stop10h 49m

Ontario

Sat 2/21

10:37 pm-8:48 am

1 stop7h 11m

$305

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 Los Angeles from

How to get the cheapest flight ticket from Washington, D.C. to Ontario

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 Ontario?

In general, April is the cheapest month to fly from Washington, D.C. to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $329. If you aren’t able to travel during the month of April, then book flights to Ontario from Washington, D.C. during October instead. Flights to Ontario in October, while not as cheap as those in April, still average around $334.

What is the cheapest Washington, D.C. to Ontario flight route?

Fly from Baltimore/Washington to Ontario for the best Washington, D.C. - Ontario flight prices

What cabin class options are available on Washington, D.C. to Ontario flights?

There is only 1 cabin class available to choose from on Washington, D.C. to Ontario 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 Washington, D.C. to Ontario flights?

You could potentially save up to 41% on your flight if you consider stops on a Washington, D.C. to Ontario flight.

How have Washington, D.C. to Ontario flight prices changed over time?

As of January 2026, prices for Washington, D.C. to Ontario flights are approximately 57% more expensive when compared to flights at the same time last year.

When to book flights from Washington, D.C. to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. to Ontario (WAS to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Ontario

Fastest flight time

5h 15m

Direct flights

Mon, Tue, Thu, Fri, Sat and Sun

Airports in Ontario

1 airport
The fastest flight from Washington, D.C. to Ontario takes 5h 15m
Direct flights go from Washington, D.C. to Ontario on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. The only airline offering direct flights is Southwest.
There is 1 airport in Ontario. From Washington, D.C. there are direct flights to Ontario (ONT).
Search flight deals

  • How far is Washington, D.C. to Ontario by plane?

    A flight from Washington, D.C. to Ontario will travel around 2260.6 mi. Flights usually cover this in 5h 15m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Washington, D.C. to Ontario Airport?

    Prices for flights from Washington, D.C. to Ontario Airport were last updated today.

  • How many operators does momondo search for flights from Washington, D.C. to Ontario Airport?

  • How old do you have to be to fly from Washington, D.C. to Ontario Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington, D.C. to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The travel and health documents required for your trip to Ontario Airport 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 Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Washington, D.C. to Ontario?

  • What is the most popular airline from Washington, D.C. to Ontario?

Best airlines flying from Washington, D.C. to Ontario

Compare and see reviews for airlines that fly from Washington, D.C. to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $129Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
DeltaPriceFrom $213Free CancellationRating
7.9
8,076 reviews
Search Delta flights
American AirlinesPriceFrom $256Free CancellationRating
7.2
11,164 reviews
Search American Airlines flights
SouthwestPriceFrom $278Free CancellationRating
8.0
4,267 reviews
Search Southwest flights
United AirlinesPriceFrom $284Free CancellationRating
7.4
9,180 reviews
Search United Airlines flights

  • Southwest Flights From Washington, D.C. to Ontario

    Southwest is one of the most popular airlines flying from Washington, D.C. to Ontario, operating 5 flights/week on average for this route. A good Southwest flight deal for Washington, D.C. to Ontario starts from $278 round-trip, up to an average price of $476. Our users have rated Southwest at 8.0/10.

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Ontario?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from Washington, D.C..

Can I find flights from Washington, D.C. to Ontario with flexible booking policies on momondo?

momondo does allow users to show only those flights to Ontario from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Washington, D.C. to Ontario?

Once you have performed a search for Washington, D.C. to Ontario flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Washington, D.C. to Ontario right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Washington, D.C. to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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