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Cheap flights from Washington, D.C. Dulles Intl Airport to Los Angeles from $74

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 1/25. 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 pm
IAD
-
ONT
10h 12m1 stop
Frontier Logo
6:56 pm - 9:54 am
ONT
-
IAD
11h 58m1 stop
$149Frontier
Fri, Feb 20 - Sun, Feb 22
Frontier Logo
10:49 am - 6:01 pm
IAD
-
ONT
10h 12m1 stop
Frontier Logo
6:56 pm - 9:54 am
ONT
-
IAD
11h 58m1 stop
$200Frontier
Fri, Feb 20 - Sun, Feb 22
Alaska Airlines Logo
6:04 pm - 10:59 am
IAD
-
ONT
19h 55m1 stop
Alaska Airlines Logo
4:03 pm - 4:26 pm
ONT
-
IAD
21h 23m1 stop
$306Alaska Airlines
Thu, Jan 8 - Mon, Jan 12
Frontier Logo
6:05 am - 3:09 pm
IAD
-
ONT
36h 04m2 stops
Frontier Logo
8:31 am - 8:56 pm
ONT
-
IAD
9h 25m1 stop
$308Frontier
Mon, Jan 5 - Sun, Jan 11
Delta Logo
6:20 am - 11:31 am
IAD
-
ONT
8h 11m1 stop
Delta Logo
12:41 pm - 11:37 pm
ONT
-
IAD
7h 56m1 stop
$319Delta
Wed, Jan 7 - Thu, Jan 8
Frontier Logo
5:35 am - 11:59 pm
IAD
-
ONT
45h 24m2 stops
Frontier Logo
8:31 am - 8:56 pm
ONT
-
IAD
9h 25m1 stop
$323Frontier
Sun, Jan 4 - Sun, Jan 11
Alaska Airlines Logo
7:05 am - 11:32 pm
IAD
-
ONT
19h 27m1 stop
Alaska Airlines Logo
12:02 pm - 5:20 pm
ONT
-
IAD
26h 18m1 stop
$326Alaska Airlines
Thu, Feb 19 - Tue, Feb 24
Delta Logo
7:30 am - 1:56 pm
IAD
-
ONT
9h 26m1 stop
Delta Logo
10:30 pm - 10:55 am
ONT
-
IAD
9h 25m1 stop
$333Delta
Thu, Jan 8 - Wed, Jan 14
Delta Logo
6:20 am - 11:31 am
IAD
-
ONT
8h 11m1 stop
Delta Logo
10:30 pm - 10:55 am
ONT
-
IAD
9h 25m1 stop
$334Delta
Thu, Jan 8 - Wed, Jan 14
Delta Logo
7:30 am - 1:56 pm
IAD
-
ONT
9h 26m1 stop
Delta Logo
10:20 pm - 9:08 am
ONT
-
IAD
7h 48m1 stop
$347Delta
Wed, Feb 11 - Tue, Feb 17

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
Jan 28
IAD11:34 amWashington, D.C. Dulles Intl
9h 46m
2 stops
ONT6:20 pmOntario
Feb 11
ONT10:58 amOntario
7h 19m
1 stop
IAD9:17 pmWashington, D.C. Dulles Intl
$352
Find similar
American Airlines
Feb 11
IAD1:08 pmWashington, D.C. Dulles Intl
12h 40m
2 stops
ONT10:48 pmOntario
Feb 17
ONT11:59 pmOntario
11h 44m
2 stops
IAD2:43 pmWashington, D.C. Dulles Intl
$357
Find similar
American Airlines
Jan 5
IAD1:57 pmWashington, D.C. Dulles Intl
10h 01m
1 stop
ONT8:58 pmOntario
Feb 3
ONT10:58 amOntario
7h 19m
1 stop
IAD9:17 pmWashington, D.C. Dulles Intl
$365
Find similar

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
Jan 5
IAD7:50 pmWashington, D.C. Dulles Intl
7h 15m
1 stop
ONT12:05 amOntario
Jan 11
ONT5:50 amOntario
7h 10m
1 stop
IAD4:00 pmWashington, D.C. Dulles Intl
$398
Find similar
Southwest
Dec 21
IAD7:50 pmWashington, D.C. Dulles Intl
7h 15m
1 stop
ONT12:05 amOntario
Dec 26
ONT12:20 pmOntario
8h 05m
1 stop
IAD11:25 pmWashington, D.C. Dulles Intl
$607
Find similar
Southwest
Dec 20
IAD7:45 pmWashington, D.C. Dulles Intl
7h 20m
1 stop
ONT12:05 amOntario
Dec 22
ONT12:20 pmOntario
8h 05m
1 stop
IAD11:25 pmWashington, D.C. Dulles Intl
$621
Find similar

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 December 8, 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 2/20

10:49 am-6:01 pm

1 stop10h 12m

Ontario

Sun 2/22

6:56 pm-9:54 am

1 stop11h 58m

$149

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 2/20

10:49 am-6:01 pm

1 stop10h 12m

Ontario

Sun 2/22

6:56 pm-9:54 am

1 stop11h 58m

$200

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 1/8

6:04 pm-10:59 am

1 stop19h 55m

Ontario

Mon 1/12

4:03 pm-4:26 pm

1 stop21h 23m

$306

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 1/5

6:05 am-3:09 pm

2 stops36h 04m

Ontario

Sun 1/11

8:31 am-8:56 pm

1 stop9h 25m

$308

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 1/7

6:20 am-11:31 am

1 stop8h 11m

Ontario

Thu 1/8

12:41 pm-11:37 pm

1 stop7h 56m

$319

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sun 1/4

5:35 am-11:59 pm

2 stops45h 24m

Ontario

Sun 1/11

8:31 am-8:56 pm

1 stop9h 25m

$323

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 2/19

7:05 am-11:32 pm

1 stop19h 27m

Ontario

Tue 2/24

12:02 pm-5:20 pm

1 stop26h 18m

$326

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 1/8

7:30 am-1:56 pm

1 stop9h 26m

Ontario

Wed 1/14

10:30 pm-10:55 am

1 stop9h 25m

$333

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 1/8

6:20 am-11:31 am

1 stop8h 11m

Ontario

Wed 1/14

10:30 pm-10:55 am

1 stop9h 25m

$334

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 2/11

7:30 am-1:56 pm

1 stop9h 26m

Ontario

Tue 2/17

10:20 pm-9:08 am

1 stop7h 48m

$347

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest 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 December 2025, prices for Washington, D.C. Dulles Intl Airport to Ontario flights are approximately 210% 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

Fastest flight time

7h 09m

Direct flights

None
The fastest flight from Washington, D.C. Dulles Intl Airport to Ontario takes 7h 09m
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.
Search flight deals

  • 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
3,085 reviews
Search Frontier flights
DeltaPriceFrom $213Free CancellationRating
7.9
8,011 reviews
Search Delta flights
United AirlinesPriceFrom $284Free CancellationRating
7.4
9,089 reviews
Search United Airlines flights
American AirlinesPriceFrom $298Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
SouthwestPriceFrom $304Free CancellationRating
8.0
4,254 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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