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Cheap flights from Washington, D.C. Dulles Intl Airport to Los Angeles from $117

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 12/4. 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. Dulles Intl Airport to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
3:55 pm - 8:10 pmIAD-ONT
7h 15m1 stop
Southwest Logo
10:45 am - 10:15 pmONT-IAD
8h 30m1 stop
$258Southwest
Find Deal
Sat, Dec 6 - Sat, Dec 13
Delta Logo
7:05 am - 12:34 pmIAD-ONT
8h 29m1 stop
Delta Logo
1:29 pm - 11:29 pmONT-IAD
7h 00m1 stop
$259Delta
Find Deal
Sat, Dec 6 - Sat, Dec 13
Alaska Airlines Logo
7:43 am - 3:17 pmIAD-ONT
10h 34m1 stop
Alaska Airlines Logo
4:11 pm - 6:23 amONT-IAD
11h 12m1 stop
$298Alaska Airlines
Find Deal
Wed, Nov 12 - Thu, Nov 13
American Airlines Logo
2:16 pm - 7:39 pmIAD-ONT
8h 23m1 stop
American Airlines Logo
10:34 pm - 10:20 amONT-IAD
8h 46m1 stop
$299American Airlines
Find Deal
Fri, Dec 5 - Mon, Dec 8
Alaska Airlines Logo
7:43 am - 3:17 pmIAD-ONT
10h 34m1 stop
Alaska Airlines Logo
6:00 am - 6:23 amONT-IAD
21h 23m1 stop
$306Alaska Airlines
Find Deal
Sat, Nov 15 - Tue, Nov 18
Frontier Logo
8:40 am - 9:27 pmIAD-ONT
15h 47m2 stops
Frontier Logo
6:45 am - 12:11 amONT-IAD
14h 26m2 stops
$310Frontier
Find Deal
Wed, Nov 5 - Sun, Nov 9
Frontier Logo
8:40 am - 9:27 pmIAD-ONT
15h 47m2 stops
Frontier Logo
8:45 am - 10:35 amONT-IAD
22h 50m1 stop
$313Frontier
Find Deal
Tue, Nov 4 - Thu, Nov 20
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
United Airlines Logo
6:00 am - 4:27 pmONT-IAD
7h 27m1 stop
$314United Airlines
Find Deal
Wed, Nov 12 - Sat, Nov 15
American Airlines Logo
2:16 pm - 10:28 pmIAD-ONT
11h 12m2 stops
American Airlines Logo
10:34 pm - 10:20 amONT-IAD
8h 46m1 stop
$333American Airlines
Find Deal
Fri, Dec 5 - Mon, Dec 8
United Airlines Logo
4:10 pm - 10:51 pmIAD-ONT
9h 41m1 stop
United Airlines Logo
1:40 pm - 12:56 amONT-IAD
8h 16m1 stop
$363United Airlines
Find Deal
Thu, Nov 20 - Mon, Nov 24

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

Our best Southwest deals on Washington, D.C. Dulles Intl Airport to Ontario flight tickets
Southwest
Dec 6
IAD3:55 pmWashington, D.C. Dulles Intl
7h 15m
1 stop
ONT8:10 pmOntario
Dec 13
ONT10:45 amOntario
8h 30m
1 stop
IAD10:15 pmWashington, D.C. Dulles Intl
$258
Find similar
Southwest
Dec 10
IAD5:45 pmWashington, D.C. Dulles Intl
7h 20m
1 stop
ONT10:05 pmOntario
Dec 18
ONT5:35 amOntario
8h 30m
1 stop
IAD5:05 pmWashington, D.C. Dulles Intl
$268
Find similar
Southwest
Jan 23
IAD9:05 amWashington, D.C. Dulles Intl
10h 50m
2 stops
ONT4:55 pmOntario
Jan 28
ONT5:55 amOntario
13h 00m
2 stops
IAD9:55 pmWashington, D.C. Dulles Intl
$330
Find similar

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 5
IAD2:16 pmWashington, D.C. Dulles Intl
8h 23m
1 stop
ONT7:39 pmOntario
Dec 8
ONT10:34 pmOntario
8h 46m
1 stop
IAD10:20 amWashington, D.C. Dulles Intl
$299
Find similar
American Airlines
Dec 5
IAD2:16 pmWashington, D.C. Dulles Intl
11h 12m
2 stops
ONT10:28 pmOntario
Dec 8
ONT10:34 pmOntario
8h 46m
1 stop
IAD10:20 amWashington, D.C. Dulles Intl
$333
Find similar
American Airlines
Dec 11
IAD2:06 pmWashington, D.C. Dulles Intl
10h 01m
1 stop
ONT9:07 pmOntario
Dec 30
ONT10:40 pmOntario
7h 02m
1 stop
IAD8:42 amWashington, D.C. Dulles Intl
$336
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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 October 22, 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

Sat 12/6

3:55 pm-8:10 pm

1 stop7h 15m

Ontario

Sat 12/13

10:45 am-10:15 pm

1 stop8h 30m

$258

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sat 12/6

7:05 am-12:34 pm

1 stop8h 29m

Ontario

Sat 12/13

1:29 pm-11:29 pm

1 stop7h 00m

$259

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 11/12

7:43 am-3:17 pm

1 stop10h 34m

Ontario

Thu 11/13

4:11 pm-6:23 am

1 stop11h 12m

$298

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 12/5

2:16 pm-7:39 pm

1 stop8h 23m

Ontario

Mon 12/8

10:34 pm-10:20 am

1 stop8h 46m

$299

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sat 11/15

7:43 am-3:17 pm

1 stop10h 34m

Ontario

Tue 11/18

6:00 am-6:23 am

1 stop21h 23m

$306

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 11/5

8:40 am-9:27 pm

2 stops15h 47m

Ontario

Sun 11/9

6:45 am-12:11 am

2 stops14h 26m

$310

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 11/4

8:40 am-9:27 pm

2 stops15h 47m

Ontario

Thu 11/20

8:45 am-10:35 am

1 stop22h 50m

$313

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 11/12

4:10 pm-10:51 pm

1 stop9h 41m

Ontario

Sat 11/15

6:00 am-4:27 pm

1 stop7h 27m

$314

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 12/5

2:16 pm-10:28 pm

2 stops11h 12m

Ontario

Mon 12/8

10:34 pm-10:20 am

1 stop8h 46m

$333

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 11/20

4:10 pm-10:51 pm

1 stop9h 41m

Ontario

Mon 11/24

1:40 pm-12:56 am

1 stop8h 16m

$363

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 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 October 2025, prices for Washington, D.C. Dulles Intl Airport to Ontario flights are approximately 62% more expensive 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 15m.

  • 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
3,129 reviews
Search Frontier flights
DeltaPriceFrom $213Free CancellationRating
7.9
7,981 reviews
Search Delta flights
United AirlinesPriceFrom $284Free CancellationRating
7.4
8,990 reviews
Search United Airlines flights
American AirlinesPriceFrom $298Free CancellationRating
7.2
11,028 reviews
Search American Airlines flights
SouthwestPriceFrom $304Free CancellationRating
8.0
4,237 reviews
Search Southwest flights

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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