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Cheap flights from Washington, D.C. Dulles Intl Airport to Los Angeles 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 Washington, D.C. Dulles Intl Airport to Los Angeles departing on 1/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Washington, D.C. Dulles Intl Airport to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:49 am - 6:01 pmIAD-ONT
10h 12m1 stop
Frontier Logo
6:56 pm - 9:54 amONT-IAD
11h 58m1 stop
$305Frontier
Find Deal
Fri, Feb 13 - Thu, Feb 19
Alaska Airlines Logo
7:34 am - 11:29 pmIAD-ONT
18h 55m1 stop
Alaska Airlines Logo
6:00 am - 4:36 pmONT-IAD
31h 36m1 stop
$306Alaska Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
Delta Logo
7:15 am - 5:07 pmIAD-ONT
12h 52m1 stop
Delta Logo
6:40 am - 11:27 pmONT-IAD
13h 47m1 stop
$307Delta
Find Deal
Wed, Dec 10 - Mon, Dec 15
Delta Logo
11:06 am - 10:47 pmIAD-ONT
14h 41m2 stops
Delta Logo
5:49 pm - 11:39 amONT-IAD
14h 50m2 stops
$318Delta
Find Deal
Thu, Dec 4 - Mon, Dec 8
American Airlines Logo
6:00 am - 1:55 pmIAD-ONT
10h 55m1 stop
American Airlines Logo
10:34 pm - 8:44 amONT-IAD
7h 10m1 stop
$347American Airlines
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Wed, Dec 3 - Wed, Dec 3
American Airlines Logo
7:55 am - 4:02 pmIAD-ONT
11h 07m2 stops
American Airlines Logo
6:17 am - 10:28 pmONT-IAD
13h 11m2 stops
$357American Airlines
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Wed, Dec 10 - Sat, Dec 13
United Airlines Logo
6:20 am - 12:38 pmIAD-ONT
9h 18m1 stop
United Airlines Logo
6:39 pm - 6:47 amONT-IAD
9h 08m1 stop
$368United Airlines
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Thu, Dec 25 - Mon, Dec 29
Southwest Logo
5:05 am - 9:10 amIAD-ONT
7h 05m1 stop
Southwest Logo
6:50 am - 10:00 pmONT-IAD
12h 10m2 stops
$406Southwest
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Sun, Dec 14 - Tue, Dec 16
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
United Airlines Logo
7:00 am - 6:27 pmONT-IAD
8h 27m1 stop
$414United Airlines
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Mon, Nov 24 - Thu, Nov 27
Southwest Logo
4:40 pm - 8:55 pmIAD-ONT
7h 15m1 stop
Southwest Logo
8:30 am - 7:05 pmONT-IAD
7h 35m1 stop
$417Southwest
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Mon, Dec 8 - Thu, Dec 18

Alaska Airlines flights from Washington, D.C. Dulles Intl Airport to Ontario

Our best Alaska Airlines deals on Washington, D.C. Dulles Intl Airport to Ontario flight tickets
Alaska Airlines
Dec 4
IAD7:34 amWashington, D.C. Dulles Intl
18h 55m
1 stop
ONT11:29 pmOntario
Dec 8
ONT6:00 amOntario
31h 36m
1 stop
IAD4:36 pmWashington, D.C. Dulles Intl
$306
Find similar
Alaska Airlines
Feb 19
IAD7:00 amWashington, D.C. Dulles Intl
14h 17m
1 stop
ONT6:17 pmOntario
Feb 24
ONT6:00 amOntario
8h 55m
1 stop
IAD5:55 pmWashington, D.C. Dulles Intl
$326
Find similar
Alaska Airlines
Jan 8
IAD6:04 pmWashington, D.C. Dulles Intl
19h 55m
1 stop
ONT10:59 amOntario
Jan 11
ONT11:53 amOntario
25h 33m
1 stop
IAD4:26 pmWashington, D.C. Dulles Intl
$327
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American Airlines flights from Washington, D.C. Dulles Intl Airport to Ontario

Our best American Airlines deals on Washington, D.C. Dulles Intl Airport to Ontario flight tickets
American Airlines
Dec 3
IAD6:00 amWashington, D.C. Dulles Intl
10h 55m
1 stop
ONT1:55 pmOntario
Dec 3
ONT10:34 pmOntario
7h 10m
1 stop
IAD8:44 amWashington, D.C. Dulles Intl
$347
Find similar
American Airlines
Dec 10
IAD7:55 amWashington, D.C. Dulles Intl
11h 07m
2 stops
ONT4:02 pmOntario
Dec 13
ONT6:17 amOntario
13h 11m
2 stops
IAD10:28 pmWashington, D.C. Dulles Intl
$357
Find similar
American Airlines
Dec 30
IAD6:05 amWashington, D.C. Dulles Intl
8h 48m
1 stop
ONT11:53 amOntario
Jan 6
ONT9:59 amOntario
10h 13m
2 stops
IAD11:12 pmWashington, D.C. Dulles Intl
$381
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momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport 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 November 6, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 2/13

10:49 am-6:01 pm

1 stop10h 12m

Ontario

Thu 2/19

6:56 pm-9:54 am

1 stop11h 58m

$305

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 12/4

7:34 am-11:29 pm

1 stop18h 55m

Ontario

Mon 12/8

6:00 am-4:36 pm

1 stop31h 36m

$306

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 12/10

7:15 am-5:07 pm

1 stop12h 52m

Ontario

Mon 12/15

6:40 am-11:27 pm

1 stop13h 47m

$307

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 12/4

11:06 am-10:47 pm

2 stops14h 41m

Ontario

Mon 12/8

5:49 pm-11:39 am

2 stops14h 50m

$318

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 12/3

6:00 am-1:55 pm

1 stop10h 55m

Ontario

Wed 12/3

10:34 pm-8:44 am

1 stop7h 10m

$347

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 12/10

7:55 am-4:02 pm

2 stops11h 07m

Ontario

Sat 12/13

6:17 am-10:28 pm

2 stops13h 11m

$357

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 12/25

6:20 am-12:38 pm

1 stop9h 18m

Ontario

Mon 12/29

6:39 pm-6:47 am

1 stop9h 08m

$368

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sun 12/14

5:05 am-9:10 am

1 stop7h 05m

Ontario

Tue 12/16

6:50 am-10:00 pm

2 stops12h 10m

$406

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 11/24

4:10 pm-10:51 pm

1 stop9h 41m

Ontario

Thu 11/27

7:00 am-6:27 pm

1 stop8h 27m

$414

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 12/8

4:40 pm-8:55 pm

1 stop7h 15m

Ontario

Thu 12/18

8:30 am-7:05 pm

1 stop7h 35m

$417

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport 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 typical price of a round-trip flight between Washington, D.C. Dulles Intl Airport and Ontario?

What is the cheapest month to fly to Ontario?

In general, September is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $273. If you aren’t able to travel during the month of September, then book flights to Ontario from Washington, D.C. Dulles Intl Airport during June instead. Flights to Ontario in June, while not as cheap as those in September, still average around $328.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $323. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. Dulles Intl Airport to Ontario for around $480.

What is the cheapest time of day to depart on your flight to Ontario?

In the afternoon is the cheapest time of day to fly from Washington, D.C. Dulles Intl Airport to Ontario when you can find flight prices for as low as $366. Flying to Ontario in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $431 on average. Flights to Ontario from Washington, D.C. Dulles Intl Airport in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

As of November 2025, prices for Washington, D.C. Dulles Intl Airport to Ontario flights are approximately 11% cheaper when compared to flights at the same time last year.

When to book flights from Washington, D.C. Dulles Intl Airport to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to Ontario (IAD to ONT) flight deals and tips

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

Direct flights

None
There are no direct flights from Washington, D.C. Dulles Intl Airport to Ontario. There are no popular flight routes from Washington, D.C. Dulles Intl Airport to Ontario.
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  • How far is Washington, D.C. Dulles Intl to Ontario by plane?

    There are 2238.2 mi between Washington, D.C. Dulles Intl and Ontario. In terms of flight time, this usually takes a little over 7h 05m.

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

    Prices for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport are refreshed on a daily basis.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport 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 airline from Washington, D.C. Dulles Intl Airport to Ontario?

Best airlines flying from Washington, D.C. Dulles Intl Airport to Ontario

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $173Free CancellationRating
5.8
3,115 reviews
Search Frontier flights
DeltaPriceFrom $213Free CancellationRating
7.9
8,001 reviews
Search Delta flights
United AirlinesPriceFrom $284Free CancellationRating
7.4
9,007 reviews
Search United Airlines flights
American AirlinesPriceFrom $298Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
SouthwestPriceFrom $304Free CancellationRating
8.0
4,241 reviews
Search Southwest flights

  • United Airlines Flights From Washington, D.C. Dulles Intl Airport to Ontario

    Across 7 United Airlines flights from Washington, D.C. Dulles Intl Airport to Ontario this week, the average price was $496, with the best United Airlines deals starting from $284 round-trip. 9,007 users have rated United Airlines on momondo, with an average score of 7.4/10.

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington, D.C. to Ontario. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Washington, D.C. to Ontario flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Ontario from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes. momondo can track prices for Washington, D.C. to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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