IAD - ONT

$151 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
$220
Typical prices: $324-$544
Frontier
Sat 11/10Sat 11/17
IAD - ONT • 2 stops
Cheapest one-way
$151
Typical prices: $164-$337
Frontier
Tue 10/23
IAD - ONT • 1 stop
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 travel
November
Cheapest • 17% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Salt Lake City (SLC)
Cheapest • Avg $273 (round-trip)
Phoenix Sky Harbor Intl (PHX)
Shortest trip • 6h 55m (one-way)
Insights
Insights
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We hope you love your trip to Ontario!
Flight Deals
Booking Insights
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

Tue, Nov 10 - Tue, Nov 17
Frontier Logo
9:06 pm - 10:35 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
16h 29m2 stops Atlanta Hartsfield-Jackson Denver Intl
Frontier Logo
6:25 am - 11:43 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
14h 18m2 stops Denver Intl Atlanta Hartsfield-Jackson
$220Frontier
Tue, Nov 3 - Tue, Nov 10
Frontier Logo
8:05 am - 11:51 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
18h 46m2 stops Atlanta Hartsfield-Jackson Denver Intl
Frontier Logo
6:25 am - 11:43 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
14h 18m2 stops Denver Intl Atlanta Hartsfield-Jackson
$220Frontier
Tue, Oct 20 - Tue, Oct 27
Multiple Airlines Logo
6:00 am - 10:31 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 31m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
11:13 am - 11:59 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 46m1 stop Seattle/Tacoma Intl
$302Multiple Airlines
Wed, Oct 21 - Tue, Oct 27
Multiple Airlines Logo
6:00 am - 10:31 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 31m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
11:13 am - 11:59 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 46m1 stop Seattle/Tacoma Intl
$307Multiple Airlines
Mon, Nov 23 - Mon, Nov 23
United Airlines Logo
8:20 am - 12:33 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 13m1 stop Denver Intl
United Airlines Logo
6:37 pm - 5:35 amONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 58m1 stop San Francisco
$346United Airlines
Sat, Feb 13 - Wed, Feb 17
United Airlines Logo
4:08 pm - 8:20 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 12m1 stop Denver Intl
United Airlines Logo
6:00 am - 4:25 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 25m1 stop San Francisco
$351United Airlines
Sat, Dec 5 - Tue, Dec 8
American Airlines Logo
7:18 am - 1:31 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 13m1 stop Dallas/Fort Worth
American Airlines Logo
12:42 pm - 11:29 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 47m1 stop Dallas/Fort Worth
$351American Airlines
Sat, Dec 5 - Wed, Dec 9
American Airlines Logo
5:10 pm - 10:57 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 47m1 stop Dallas/Fort Worth
American Airlines Logo
12:42 pm - 11:29 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 47m1 stop Dallas/Fort Worth
$351American Airlines
Sat, Nov 7 - Mon, Nov 16
Delta Logo
6:00 am - 11:06 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 06m1 stop Atlanta Hartsfield-Jackson
Delta Logo
11:10 pm - 9:09 amONT  Ontario-IAD Washington, D.C. Dulles Intl
6h 59m1 stop Atlanta Hartsfield-Jackson
$351Delta
Mon, Dec 7 - Mon, Dec 14
Delta Logo
12:34 pm - 6:38 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 04m1 stop Atlanta Hartsfield-Jackson
Delta Logo
11:08 pm - 9:16 amONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 08m1 stop Atlanta Hartsfield-Jackson
$351Delta
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 $324 to $544. The lowest price found in the past 5 days was $220, 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, Tuesday is the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to Ontario. It’s 9% cheaper than the average day, while Sunday is the most expensive, with prices 10% higher.

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

•November is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Ontario at $337 round-trip.
•March ($653) and December ($543) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 93% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

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

Low season

February

Cheapest flight

$151
Beat the crowds with an average 44% drop in travelers.
The most popular month to fly with an average 91% 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?

    Only Economy Class is available on flights from Washington, D.C. Dulles Intl Airport to Ontario.

  • 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 $324 to $544, with an average of $405 over the past 12 months. Anything below $324 counts as a good deal.

  • 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 $220 to $2,163. That means the highest observed fare was about 10x 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 $172, 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 starting from around $18 for economy cars. Top options include:

    • Fox
    • Thrifty
    • Europcar
    • Dollar
    • Alamo

  • 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:

    • Denver Intl (DEN) - 31% of one-stop connections
    • Atlanta Hartsfield-Jackson (ATL) - 18% of one-stop connections
    • Dallas/Fort Worth (DFW) - 18% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 16% 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 17% on flights from Washington, D.C. Dulles Intl Airport to Ontario. Tuesday is the cheapest departure day at $372 round-trip on average, while Sunday is the most expensive at $448, a difference of $76.

    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 6h 55m, compared with 7h 23m 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 Tuesday departure and avoid flying on Sunday. On this route, Tuesday flights average $372, about $76 less than Sunday fares (17% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Washington, D.C. Dulles Intl Airport to Ontario trip for November. Fares historically average $337 round-trip in that month - typically $316 less than the most expensive month, which is March (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.

    • Azure Hotel & Suites, Trademark Collection by Wyndham
    • La Quinta Inn & Suites by Wyndham Ontario Airport
    • Ontario Airport Inn

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