Which layover airport has the shortest travel time from Ontario to Washington, D.C.?

Flights connecting via Chicago (MDW) have the shortest average one-way travel time: 6h 30m.

What airlines fly to Washington, D.C.?

United Airlines, American Airlines and Southwest are the top three most popular airlines that fly to Washington, D.C. from Ontario according to our data. United Airlines is the first choice among our users, with 45% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 9 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

Which airport is the most popular layover for flights between Ontario and Washington, D.C.?

Denver (DEN) was the most common stop: 72% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Ontario to Washington, D.C.?

Flights via Denver (DEN) offer the lowest average round-trip price of $277.

Which layover airport has the shortest connection time from Ontario to Washington, D.C.?

Dallas (DFW) has the shortest average layover time for this route: 1h 24m.

What is the cheapest airline that flies from Ontario to Washington, D.C.?

Alaska Airlines, United Airlines, and Delta are the most popular carriers operating from Ontario to Washington, D.C.

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

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

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

There are 6 operators available for flights from Ontario Airport to Washington, D.C. as of February 2026.

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

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 Ontario Airport to Washington, D.C..

What documentation or ID do you need to fly to Washington, D.C.?

The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$65 Cheap Flights from Ontario to Washington, D.C. in 2026

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Find the cheapest flights from Ontario to Washington, D.C.

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:40 am - 9:59 pm

ONT

DCA

10h 19m

1 stop

8:00 am - 11:59 pm

DCA

ONT

18h 59m

1 stop

$185Frontier

Tue, Mar 3 - Tue, Mar 10

6:05 am - 4:59 pm

ONT

DCA

7h 54m

1 stop

6:00 pm - 11:59 pm

DCA

ONT

8h 59m

1 stop

$188Frontier

Thu, Mar 5 - Wed, Mar 11

6:10 am - 4:59 pm

ONT

DCA

7h 49m

1 stop

2:00 pm - 9:34 pm

DCA

ONT

10h 34m

1 stop

$194Frontier

Mon, Mar 2 - Wed, Mar 4

6:10 am - 4:59 pm

ONT

DCA

7h 49m

1 stop

2:00 pm - 9:34 pm

DCA

ONT

10h 34m

1 stop

$195Frontier

Mon, Mar 2 - Wed, Mar 4

8:26 am - 10:00 am

ONT

BWI

22h 34m

1 stop

7:34 pm - 11:55 pm

BWI

ONT

31h 21m

2 stops

$207Multiple Airlines

Thu, Apr 23 - Mon, Apr 27

8:26 am - 9:57 am

ONT

BWI

22h 31m

1 stop

8:59 pm - 4:38 pm

BWI

ONT

22h 39m

1 stop

$218Multiple Airlines

Fri, Apr 17 - Sun, Apr 19

6:25 am - 3:55 pm

ONT

IAD

6h 30m

1 stop

5:50 am - 9:55 am

IAD

ONT

7h 05m

1 stop

$297Southwest

Wed, Mar 11 - Wed, Mar 18

11:53 am - 11:55 pm

ONT

IAD

9h 02m

1 stop

11:04 am - 10:37 pm

IAD

ONT

14h 33m

2 stops

$308Delta

Wed, Apr 15 - Tue, Apr 21

7:59 pm - 8:48 am

ONT

IAD

9h 49m

2 stops

6:00 am - 1:48 pm

IAD

ONT

10h 48m

1 stop

$312American Airlines

Wed, Mar 11 - Wed, Mar 18

5:55 pm - 9:15 am

ONT

IAD

12h 20m

2 stops

11:04 am - 10:37 pm

IAD

ONT

14h 33m

2 stops

$313Delta

Wed, Apr 15 - Tue, Apr 21

Southwest flights from Ontario to Washington, D.C.

Our best Southwest deals on Ontario to Washington, D.C. flight tickets

Southwest

Mar 11

ONT6:25 amOntario

6h 30m

1 stop

IAD3:55 pmWashington, D.C. Dulles Intl

Mar 18

IAD5:50 amWashington, D.C. Dulles Intl

7h 05m

1 stop

ONT9:55 amOntario

$297

Southwest

Mar 4

ONT10:40 amOntario

8h 15m

2 stops

IAD9:55 pmWashington, D.C. Dulles Intl

Mar 9

IAD5:50 amWashington, D.C. Dulles Intl

7h 05m

1 stop

ONT9:55 amOntario

$324

Southwest

Mar 10

ONT10:35 amOntario

10h 05m

2 stops

IAD11:40 pmWashington, D.C. Dulles Intl

Mar 14

IAD6:05 pmWashington, D.C. Dulles Intl

7h 20m

1 stop

ONT10:25 pmOntario

$383

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

Our best American Airlines deals on Ontario to Washington, D.C. flight tickets

American Airlines

Mar 11

ONT7:59 pmOntario

9h 49m

2 stops

IAD8:48 amWashington, D.C. Dulles Intl

Mar 18

IAD6:00 amWashington, D.C. Dulles Intl

10h 48m

1 stop

ONT1:48 pmOntario

$312

American Airlines

Mar 9

ONT11:58 pmOntario

11h 41m

2 stops

IAD2:39 pmWashington, D.C. Dulles Intl

Mar 14

IAD7:03 pmWashington, D.C. Dulles Intl

7h 56m

1 stop

ONT11:59 pmOntario

$333

American Airlines

Feb 15

ONT6:15 amOntario

10h 24m

2 stops

BWI7:39 pmBaltimore/Washington

Feb 22

BWI7:08 pmBaltimore/Washington

7h 51m

1 stop

ONT11:59 pmOntario

$343

momondo Fare Finder

Use the filters below to find and compare flights from Ontario to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 3/3

8:40 am-9:59 pm

1 stop10h 19m

Washington, D.C. Reagan-National

Tue 3/10

8:00 am-11:59 pm

1 stop18h 59m

$185

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 3/5

6:05 am-4:59 pm

1 stop7h 54m

Washington, D.C. Reagan-National

Wed 3/11

6:00 pm-11:59 pm

1 stop8h 59m

$188

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 3/2

6:10 am-4:59 pm

1 stop7h 49m

Washington, D.C. Reagan-National

Wed 3/4

2:00 pm-9:34 pm

1 stop10h 34m

$194

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 3/2

6:10 am-4:59 pm

1 stop7h 49m

Washington, D.C. Reagan-National

Wed 3/4

2:00 pm-9:34 pm

1 stop10h 34m

$195

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Thu 4/23

8:26 am-10:00 am

1 stop22h 34m

Baltimore/Washington

Mon 4/27

7:34 pm-11:55 pm

2 stops31h 21m

$207

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 4/17

8:26 am-9:57 am

1 stop22h 31m

Baltimore/Washington

Sun 4/19

8:59 pm-4:38 pm

1 stop22h 39m

$218

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 3/11

6:25 am-3:55 pm

1 stop6h 30m

Washington, D.C. Dulles Intl

Wed 3/18

5:50 am-9:55 am

1 stop7h 05m

$297

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 4/15

11:53 am-11:55 pm

1 stop9h 02m

Washington, D.C. Dulles Intl

Tue 4/21

11:04 am-10:37 pm

2 stops14h 33m

$308

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 3/11

7:59 pm-8:48 am

2 stops9h 49m

Washington, D.C. Dulles Intl

Wed 3/18

6:00 am-1:48 pm

1 stop10h 48m

$312

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 4/15

5:55 pm-9:15 am

2 stops12h 20m

Washington, D.C. Dulles Intl

Tue 4/21

11:04 am-10:37 pm

2 stops14h 33m

$313

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

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

Prices

Airlines

Layovers

What is the cheapest month to fly to Washington, D.C.?

The month of January is, on average, the cheapest month to fly to Washington, D.C. from Ontario, with most prices found around $223. If you’re not able to fly to Washington, D.C. in January, then September is your next best option. Flight prices from Ontario to Washington, D.C. during September average around $226.

What is the cheapest day to depart on your flight to Washington, D.C.?

On average, the least expensive day to fly to Washington, D.C. from Ontario is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $417. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Washington, D.C. for around $555.

What is the cheapest time of day to depart on your flight to Washington, D.C.?

In the afternoon is the cheapest time of day to fly from Ontario to Washington, D.C. when you can find flight prices for as low as $386. Flying to Washington, D.C. in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at noon because they tend to be around $475. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

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

How far in advance should I book a flight to Washington, D.C.?

You are more likely to see cheaper flights to Washington, D.C. from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $492 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from Ontario for as low as $297 on momondo.

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

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

You could potentially save up to 35% on your flight if you consider stops on a Ontario to Washington, D.C. flight.

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

As of February 2026, prices for Ontario to Washington, D.C. flights are approximately 16% cheaper when compared to flights at the same time last year.

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

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

Estimated round-trip price

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

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

Best Price Found	$224
Fastest flight time	4h 40m
Direct flights	Every day
Airports in Washington, D.C.	2 airports

The best one-way flight to Washington, D.C. from Ontario in the past 72 hours is $224. The best round-trip flight deal from Ontario to Washington, D.C. found on momondo in the last 72 hours is $419.

The fastest flight from Ontario to Washington, D.C. takes 4h 40m

Direct flights go from Ontario to Washington, D.C. every day.

There are 2 airports in Washington, D.C.. From Ontario there are direct flights to Baltimore/Washington (BWI).

Search flight deals

How far is Ontario to Washington, D.C. by plane?
Ontario and Washington, D.C. are 2260.6 mi apart from one another. In terms of flight time, this usually takes a little over 4h 40m.
When did momondo last update prices for flights from Ontario Airport to Washington, D.C.?
Prices for flights from Ontario Airport to Washington, D.C. are refreshed on a daily basis.
How many operators does momondo search for flights from Ontario Airport to Washington, D.C.?
There are 6 operators available for flights from Ontario Airport to Washington, D.C. as of February 2026.
How old do you have to be to fly from Ontario Airport to Washington, D.C.?
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 Ontario Airport to Washington, D.C..
What documentation or ID do you need to fly to Washington, D.C.?
The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Ontario to Washington, D.C.?
momondo data reveals that the most frequently booked plane model on the route from Ontario to Washington, D.C. is Boeing 737 MAX 8, representing 21.62% of all bookings. The subsequent popular models are Airbus A321neo at 10.81%, Boeing 737-800 Passenger/BBJ2 (winglets) at 10.81%, and Airbus A318/A319/A320/A321 at 6.76%.
What is the most popular airline from Ontario to Washington, D.C.?
Based on momondo bookings for flights between Ontario and Washington, D.C., the leading airline is Frontier, making up 49% of the total bookings. Other popular airlines include Southwest with 26%, American Airlines with 10%, and Delta with 8%.

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

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. with momondo

Airline	Rating	Free Cancellation	Price
Spirit Airlines	PriceFrom $72	Free Cancellation	Rating 6.3 8,451 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $136	Free Cancellation	Rating 5.7 3,052 reviews	Search Frontier flights
Delta	PriceFrom $172	Free Cancellation	Rating 7.9 8,200 reviews	Search Delta flights
United Airlines	PriceFrom $226	Free Cancellation	Rating 7.4 9,289 reviews	Search United Airlines flights
Southwest	PriceFrom $258	Free Cancellation	Rating 8.0 4,284 reviews	Search Southwest flights
American Airlines	PriceFrom $278	Free Cancellation	Rating 7.2 11,288 reviews	Search American Airlines flights

Alexandria

National Harbor

Gettysburg

Arlington

Waldorf

Woodbridge

Laurel

Colonial Beach

Tysons

Silver Spring

Towson

Fredericksburg

Gaithersburg

Rockville

Manassas

Springfield

Fairfax

Linthicum Heights

Bethesda

Glen Burnie

Why use momondo?

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

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

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

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

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

momondo helps you find the best flight between Ontario and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes. momondo can track prices for Ontario to Washington, D.C. 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.

An easier way to manage your Washington, D.C. trip

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Fly into one of these airports located in Washington, D.C.

Washington, D.C. Reagan-National Airport

Washington, D.C. Dulles Intl Airport

Cheap flights from Ontario to Washington, D.C. 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 Ontario to Washington, D.C. departing on 4/13. 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 Ontario to Washington, D.C.

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Southwest flights from Ontario to Washington, D.C.

Our best Southwest deals on Ontario to Washington, D.C. flight tickets

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

Our best American Airlines deals on Ontario to Washington, D.C. flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Ontario to Washington, D.C. that are best for you.

See travel insights to Washington, D.C. from

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

What is the cheapest month to fly to Washington, D.C.?

What is the cheapest day to depart on your flight to Washington, D.C.?

What is the cheapest time of day to depart on your flight to Washington, D.C.?

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

How far in advance should I book a flight to Washington, D.C.?

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

Can stopping save me money on Ontario to Washington, D.C. flights?

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

What is the cheapest airline that flies from Ontario to Washington, D.C.?

What airlines fly to Washington, D.C.?

Which airport is the most popular layover for flights between Ontario and Washington, D.C.?

Which layover airport offers the lowest fares from Ontario to Washington, D.C.?

Which layover airport has the shortest travel time from Ontario to Washington, D.C.?

Which layover airport has the shortest connection time from Ontario to Washington, D.C.?

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

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

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

Best Price Found

Fastest flight time

Direct flights

Airports in Washington, D.C.

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

Compare and see reviews for airlines that fly from Ontario to Washington, D.C. with momondo

Traveling to a place near Washington, D.C.?

Why use momondo?

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

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

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

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

An easier way to manage your Washington, D.C. trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.

Fly your favorite airline to Washington, D.C.

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Washington, D.C.

List of cabin classes available on flights landing in Washington, D.C.. Availability may vary depending on flight origin and airline.

Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo

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