IAD - ONT

$146 Find Cheap Flights from Washington Dulles Airport to Ontario - Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$266
Typical prices: $346-$598
Frontier
Sun 12/9Tue 2/6
IAD - ONT • 2 stops
Cheapest one-way
$173
Typical prices: $179-$356
Frontier
Sun 12/16
IAD - ONT • 2 stops
Nonstop flights
Not available
There are currently no direct flights between Washington, D.C. Dulles Intl Airport and Ontario. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to book
25 weeks
in advance
Our data shows that travelers who book at least 25 weeks in advance save around 48% compared to booking last minute.
Insights
Insights
When to travel
February
Cheapest • 21% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Seattle/Tacoma Intl (SEA)
Cheapest • Avg $286 (round-trip)
Phoenix Sky Harbor Intl (PHX)
Shortest trip • 7h 07m (one-way)
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Insights
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We hope you love your trip to Ontario!
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Flight Deals

Cheap Flights from Dulles Intl to Ontario (IAD-ONT)

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

Recent round-trip flight deals from Dulles Intl to Ontario

Wed, Dec 9 - Sat, Feb 6
Frontier Logo
12:06 pm - 10:17 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
13h 11m2 stops Atlanta Hartsfield-Jackson Denver Intl
Frontier Logo
6:30 am - 12:19 amONT  Ontario-IAD Washington, D.C. Dulles Intl
14h 49m2 stops Denver Intl Atlanta Hartsfield-Jackson
$266Frontier
Tue, Dec 15 - Fri, Dec 18
Frontier Logo
8:55 pm - 7:44 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
13h 49m1 stop Dallas/Fort Worth
Frontier Logo
10:23 am - 6:07 amONT  Ontario-IAD Washington, D.C. Dulles Intl
16h 44m1 stop Las Vegas Harry Reid Intl
$267Frontier
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, Feb 3 - Mon, Feb 8
United Airlines Logo
2:34 pm - 8:01 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 27m1 stop San Francisco
United Airlines Logo
6:37 pm - 7:32 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 55m1 stop San Francisco
$351United Airlines
Thu, Jan 21 - Sat, Jan 23
Delta Logo
4:43 pm - 9:43 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 00m1 stop Atlanta Hartsfield-Jackson
Delta Logo
7:05 am - 4:58 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
6h 53m1 stop Atlanta Hartsfield-Jackson
$351Delta
Wed, Jan 20 - Mon, Jan 25
Delta Logo
4:43 pm - 9:43 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 00m1 stop Atlanta Hartsfield-Jackson
Delta Logo
1:09 pm - 12:46 amONT  Ontario-IAD Washington, D.C. Dulles Intl
8h 37m1 stop Atlanta Hartsfield-Jackson
$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. Dulles Intl Airport 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. Dulles Intl Airport to Ontario?

Round-trip flights from Washington, D.C. Dulles Intl Airport to Ontario typically range from $346 to $598. The lowest price found in the past 5 days was $266, on Frontier.

What's the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport to Ontario. It’s 12% cheaper than the average day, while Tuesday is the most expensive, with prices 25% higher.

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

•February is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Ontario at $357 round-trip.
•December ($728) and March ($653) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 103% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

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

Flights from Washington, D.C. Dulles Intl Airport to Ontario are cheapest 25 weeks before departure. Booking in this window typically costs about 48% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Find deals

Key details for Washington, D.C. Dulles Intl Airport to Ontario flights

Low season

February

Cheapest flight

$173
Beat the crowds with an average 43% drop in travelers.
The most popular month to fly with an average 37% increase in travelers.
One-way flight from Washington, D.C. Dulles Intl Airport to Ontario

When to book flights from Dulles Intl to Ontario

Are your dates flexible? Find out the best times to travel from Dulles Intl 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. Dulles Intl Airport 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. Dulles Intl Airport to Ontario?

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

    • Economy Class
    • First Class

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

    A nonstop flight from Washington, D.C. Dulles Intl Airport to Ontario takes 00m, covering 2,236 miles.

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

    Round-trip flights from Washington, D.C. Dulles Intl Airport to Ontario range from $346 to $598, with an average of $451 over the past 12 months. Anything below $346 counts as a good deal.

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

    Last-minute fares on this route (booked within two weeks of departure) run 36% above the $451 route average. Book 25 weeks before departure for the lowest fares.

  • Have flight prices from Washington, D.C. Dulles Intl Airport 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 $277 to $2,207. That means the highest observed fare was about 8x higher than the lowest one.

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

    One-way fares from Washington, D.C. Dulles Intl Airport to Ontario are currently lower than usual. Average one-way flight prices are about $190, which is 25% 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. Dulles Intl Airport to Ontario?

    Flights from Washington, D.C. Dulles Intl Airport to Ontario usually depart from Washington, D.C. Dulles Intl (IAD) and arrive at Ontario (ONT).

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

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

    • Dallas/Fort Worth (DFW) - 23% of one-stop connections
    • Denver Intl (DEN) - 22% of one-stop connections
    • Atlanta Hartsfield-Jackson (ATL) - 18% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 18% of one-stop connections

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

    Yes. Flexible dates can save you up to 30% on flights from Washington, D.C. Dulles Intl Airport to Ontario. Wednesday is the cheapest departure day at $397 round-trip on average, while Tuesday is the most expensive at $566, a difference of $169.

    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. Dulles Intl Airport to Ontario?

    Flying via Phoenix Sky Harbor Intl (PHX) gives the shortest average 1-stop total travel time at 7h 07m, compared with 7h 33m via Denver Intl (DEN) and 7h 37m via Charlotte Douglas (CLT).

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

    Ontario is 3 hours behind Washington, D.C. Dulles Intl Airport (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. Dulles Intl Airport 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 Tuesday. On this route, Wednesday flights average $397, about $169 less than Tuesday fares (30% 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 48% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Washington, D.C. Dulles Intl Airport to Ontario trip for February. Fares historically average $357 round-trip in that month - typically $371 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 Dulles Intl to Ontario

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

Car rentals in Ontario
Hotels in Ontario
Vacations in Ontario