WAS - ONT

$126 Find Cheap Flights from Washington, D.C. to Ontario - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$265
Typical prices: $321-$578
Frontier
Sun 12/2Sun 12/9
IAD - ONT • 2 stops
Cheapest one-way
$126
Typical prices: $179-$348
Frontier
Fri 1/5
DCA - ONT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Washington, D.C. and Ontario. You'll need to take a connecting flight to reach the destination.
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Insights
Top routes
DCA - ONT
Cheapest • 8% average savings
IAD - ONT
Most popular
Insights
Insights
When to book
25 weeks
in advance
Our data shows that travelers who book at least 25 weeks in advance save around 34% compared to booking last minute.
Insights
Insights
When to travel
January
Cheapest • 35% price drop
November
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Houston Hobby (HOU)
Cheapest • Avg $236 (round-trip)
Dallas Love Field (DAL)
Shortest trip • 7h 37m (one-way)
Insights
Insights
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We hope you love your trip to Ontario!
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Flight Deals

Cheap Flights from Washington, D.C. to Ontario (WAS-ONT)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Washington, D.C. to Ontario

Wed, Dec 2 - Wed, Dec 9
Frontier Logo
12:06 pm - 1:00 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
27h 54m2 stops Atlanta Hartsfield-Jackson Las Vegas Harry Reid Intl
Frontier Logo
11:30 am - 2:49 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
24h 19m2 stops Denver Intl Atlanta Hartsfield-Jackson
$265Frontier
Wed, Dec 2 - Thu, Dec 3
Frontier Logo
7:00 am - 10:20 pmDCA  Washington, D.C. Reagan-National-ONT Ontario
18h 20m1 stop Denver Intl
Frontier Logo
11:30 am - 9:55 pmONT  Ontario-DCA Washington, D.C. Reagan-National
7h 25m1 stop Denver Intl
$265Frontier
Thu, Nov 26 - Thu, Dec 10
Multiple Airlines Logo
1:09 pm - 7:36 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 27m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
5:01 pm - 5:35 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 34m1 stop Seattle/Tacoma Intl
$302Multiple Airlines
Mon, Dec 7 - Thu, Dec 10
Multiple Airlines Logo
8:55 pm - 7:44 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
13h 49m1 stop Dallas/Fort Worth
Multiple Airlines Logo
5:01 pm - 5:35 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 34m1 stop Seattle/Tacoma Intl
$315Multiple Airlines
Thu, Jan 28 - Thu, Feb 4
United Airlines Logo
2:39 pm - 10:15 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
10h 36m1 stop Houston George Bush Intcntl
United Airlines Logo
6:37 pm - 5:25 amONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 48m1 stop San Francisco
$351United Airlines
Wed, Dec 2 - Wed, Dec 9
United Airlines Logo
2:24 pm - 9:59 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
10h 35m1 stop Houston George Bush Intcntl
United Airlines Logo
11:20 am - 9:57 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 37m1 stop San Francisco
$351United Airlines
Thu, Dec 3 - Wed, Dec 9
Delta Logo
6:00 am - 11:07 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 07m1 stop Atlanta Hartsfield-Jackson
Delta Logo
12:20 pm - 12:41 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 21m1 stop Atlanta Hartsfield-Jackson
$351Delta
Thu, Jan 7 - Fri, Jan 15
Delta Logo
7:00 am - 2:50 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
10h 50m1 stop Seattle/Tacoma Intl
Delta Logo
1:20 pm - 11:31 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 11m1 stop Salt Lake City
$351Delta
Sat, Dec 5 - Fri, Dec 11
American Airlines Logo
7:18 am - 1:24 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 06m1 stop Dallas/Fort Worth
American Airlines Logo
1:02 pm - 11:30 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 28m1 stop Dallas/Fort Worth
$353American Airlines
Wed, Jan 27 - Mon, Feb 1
American Airlines Logo
5:08 pm - 11:13 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 05m1 stop Dallas/Fort Worth
American Airlines Logo
12:45 pm - 10:55 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 10m1 stop Dallas/Fort Worth
$366American Airlines
Booking Insights

Price, demand and travel trends for Washington, D.C. to Ontario flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from Washington, D.C. to Ontario?

Round-trip flights from Washington, D.C. to Ontario typically range from $321 to $578. The lowest price found in the past 5 days was $265, on Frontier.

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

Washington, D.C. Reagan-National Airport (DCA) to Ontario (ONT) is the cheapest Washington, D.C. to Ontario route, averaging $387 round-trip. Other Washington, D.C. to Ontario routes average $451, based on KAYAK data over the past 12 months.

What's the cheapest day of the week to fly from Washington, D.C. to Ontario?

Based on deals KAYAK users found in the last 12 months, Wednesday is the cheapest day of the week to fly from Washington, D.C. to Ontario. It’s 11% cheaper than the average day, while Sunday is the most expensive, with prices 17% higher.

What’s the cheapest month to fly from Washington, D.C. to Ontario?

•January is the cheapest month to fly from Washington, D.C. to Ontario at $273 round-trip.
•December ($615) and March ($501) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 125% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are flights from Washington, D.C. to Ontario the cheapest?

Flights from Washington, D.C. to Ontario are cheapest 25 weeks before departure. Booking in this window typically costs about 34% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

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Key details for Washington, D.C. to Ontario flights

Low season

April

Cheapest flight

$126
Beat the crowds with an average 30% drop in travelers.
The most popular month to fly with an average 37% increase in travelers.
One-way flight from Washington, D.C. Reagan-National Airport to Ontario

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

Are your dates flexible? Find out the best times to travel from Washington, D.C. to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Washington, D.C. to Ontario flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Washington, D.C. to Ontario?

    Two cabin classes are available on flights from Washington, D.C. to Ontario:

    • Economy Class
    • First Class

  • How long is a flight from Washington, D.C. to Ontario?

    A nonstop flight from Washington, D.C. to Ontario takes 00m, covering 2,258 miles.

  • Do I need a passport to fly from Washington, D.C. to Ontario?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • How much should I expect to pay for a Washington, D.C. to Ontario flight?

    Round-trip flights from Washington, D.C. to Ontario range from $321 to $578, with an average of $423 over the past 12 months. Anything below $321 counts as a good deal.

  • How expensive are last-minute Washington, D.C. to Ontario flights?

    Last-minute fares on this route (booked within two weeks of departure) run 14% above the $423 route average. Book 25 weeks before departure for the lowest fares.

  • Have flight prices from Washington, D.C. to Ontario changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $265 to $2,116. That means the highest observed fare was about 8x higher than the lowest one.

  • How are flight prices from Washington, D.C. to Ontario looking right now?

    One-way fares from Washington, D.C. to Ontario are currently lower than usual. Average one-way flight prices are about $175, which is 30% below the typical average for this route.

  • What car rental options are available at Ontario Airport (ONT)?

    Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates averaging $60 for economy cars. Top options include:

    • Fox
    • Europcar
    • Thrifty
    • Alamo
    • Dollar

  • Which airports can I use when flying from Washington, D.C. to Ontario?

    Flights from Washington, D.C. to Ontario may depart from several airports in Washington, D.C. area, including Washington, D.C. Reagan-National (DCA) and Washington, D.C. Dulles Intl (IAD). Flights usually arrive at Ontario (ONT).

  • Which airports do connecting flights from Washington, D.C. to Ontario pass through?

    One-stop flights from Washington, D.C. to Ontario most commonly connect through:

    • Denver Intl (DEN) - 35% of one-stop connections
    • Dallas/Fort Worth (DFW) - 22% of one-stop connections
    • Atlanta Hartsfield-Jackson (ATL) - 13% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 8% of one-stop connections

  • Can I save money by using flexible dates for flights from Washington, D.C. to Ontario?

    Yes. Flexible dates can save you up to 25% on flights from Washington, D.C. to Ontario. Wednesday is the cheapest departure day at $378 round-trip on average, while Sunday is the most expensive at $499, a difference of $121.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from Washington, D.C. to Ontario?

    Flying via Houston Hobby (HOU) gives the shortest average 1-stop total travel time at 7h 07m, compared with 7h 37m via Dallas Love Field (DAL) and 7h 43m via Nashville Intl (BNA).

  • What is the time difference between Washington, D.C. and Ontario?

    Ontario is 3 hours behind Washington, D.C. (Pacific Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Ontario?

    Some of the most popular sights in Ontario are Ontario Convention Center and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

Your guide to booking Washington, D.C. to Ontario flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Wednesday departure and avoid flying on Sunday. On this route, Wednesday flights average $378, about $121 less than Sunday fares (24% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 25 weeks before you fly. On this route, that window historically saves about 34% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Washington, D.C. to Ontario trip for January. Fares historically average $273 round-trip in that month - typically $342 less than the most expensive month, which is December (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ontario Airport.

    • Ontario Airport Inn
    • Azure Hotel & Suites, Trademark Collection by Wyndham
    • Holiday Inn Ontario Airport By IHG

More options for your flight from Washington, D.C. to Ontario

Complete your trip to Ontario with a hotel stay or car rental

Car rentals in Ontario
Hotels in Ontario
Vacations in Ontario