IAD - ONT

$176 Find Cheap Flights from Washington Dulles Airport to Ontario - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$145
Typical prices: $324-$544
Frontier
Mon 9/17Fri 9/28
IAD - ONT • 1 stop
Cheapest one-way
$174
Typical prices: $164-$337
Frontier
Mon 10/22
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 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 52m (one-way)
Insights
Insights
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We hope you love your trip to Ontario!
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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

Thu, Sep 17 - Mon, Sep 28
Frontier Logo
12:30 pm - 6:39 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 09m1 stop Dallas/Fort Worth
Frontier Logo
8:24 pm - 6:20 amONT  Ontario-IAD Washington, D.C. Dulles Intl
6h 56m1 stop Las Vegas Harry Reid Intl
$145Frontier
Sat, Oct 3 - Tue, Oct 6
Frontier Logo
12:30 pm - 4:46 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 16m1 stop Dallas/Fort Worth
Frontier Logo
5:44 pm - 6:20 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 36m1 stop Las Vegas Harry Reid Intl
$252Frontier
Tue, Sep 22 - Tue, Sep 29
Multiple Airlines Logo
7:00 am - 2:16 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
10h 16m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
5:44 pm - 6:20 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 36m1 stop Las Vegas Harry Reid Intl
$302Multiple Airlines
Tue, Sep 29 - Tue, Sep 29
Multiple Airlines Logo
7:00 am - 2:16 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
10h 16m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
5:44 pm - 6:20 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 36m1 stop Las Vegas Harry Reid Intl
$302Multiple Airlines
Thu, Sep 24 - Wed, Sep 30
United Airlines Logo
6:35 am - 12:18 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 43m1 stop San Francisco
United Airlines Logo
11:10 am - 10:09 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 59m1 stop San Francisco
$351United Airlines
Wed, Sep 23 - Wed, Sep 30
United Airlines Logo
5:15 pm - 10:59 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 44m1 stop Chicago O'Hare Intl
United Airlines Logo
1:52 pm - 1:13 amONT  Ontario-IAD Washington, D.C. Dulles Intl
8h 21m1 stop San Francisco
$351United Airlines
Wed, Nov 18 - Wed, Nov 25
Delta Logo
6:00 am - 11:08 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 08m1 stop Atlanta Hartsfield-Jackson
Delta Logo
11:57 am - 12:20 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 23m1 stop Seattle/Tacoma Intl
$351Delta
Thu, Dec 3 - Mon, Dec 7
Delta Logo
5:00 pm - 9:56 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 56m1 stop Atlanta Hartsfield-Jackson
Delta Logo
11:08 pm - 11:39 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 31m1 stop Atlanta Hartsfield-Jackson
$351Delta
Fri, Feb 5 - Thu, Feb 18
American Airlines Logo
7:14 am - 1:32 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 18m1 stop Dallas/Fort Worth
American Airlines Logo
11:59 pm - 11:39 amONT  Ontario-IAD Washington, D.C. Dulles Intl
8h 40m1 stop Dallas/Fort Worth
$366American Airlines
Sat, Sep 12 - Wed, Sep 16
American Airlines Logo
6:52 am - 11:47 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 55m1 stop Dallas/Fort Worth
American Airlines Logo
1:04 pm - 9:55 amONT  Ontario-IAD Washington, D.C. Dulles Intl
17h 51m2 stops Phoenix Sky Harbor Intl Charlotte Douglas
$403American 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 from Washington, D.C. Dulles Intl Airport to Ontario 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 start at $145. Prices are below average for this route right now, with typical round-trip fares ranging from $324 to $544. The lowest price found in the past 5 days was $145 on Frontier.

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

Tuesday is the cheapest day of the week to fly from Washington, D.C. Dulles Intl Airport to Ontario, it is 9% cheaper than the average day. Sunday is the most expensive day with flight prices 10% higher than average. Based on deals found by KAYAK users in the last 12 months.

What is 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

$145
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly and prices are also 11% lower on average.
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 route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • 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).

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

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

    • Economy Class
    • Business Class
    • First Class

  • 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) - 27% of one-stop connections
    • Atlanta Hartsfield-Jackson (ATL) - 20% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 20% of one-stop connections
    • Dallas/Fort Worth (DFW) - 18% of one-stop connections

    Denver Intl (DEN) handles the largest share of one-stop connections on this route.

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

    Yes. Being flexible with your travel dates can save you up to 17% on the Washington, D.C. Dulles Intl Airport to Ontario route. 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.

  • What popular places can I visit in Ontario?

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

  • 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 0h 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 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 $177, which is 23% below the typical average for this route.

  • 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 52m, compared with 7h 19m via Denver Intl (DEN) and 7h 24m 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 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

  • 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.

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 can be flexible, aim for a Tuesday departure instead of Sunday. On this route, Tuesday flights average $372 - about $76 less than Sunday (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
    - Holiday Inn Ontario Airport By IHG

Everything you need to know for your flight from Dulles Intl to Ontario

Information on your arrival and departure airports

Washington Dulles Airport (IAD)
Ontario (ONT)