ONT - IAD

$116 Find Cheap Flights from Ontario to Washington Dulles Airport - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$257
Typical prices: $256-$365
Frontier
Fri 9/4Wed 9/9
ONT - IAD • 1 stop
Cheapest one-way
$116
Typical prices: $159-$387
Frontier
Thu 10/22
ONT - IAD • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Ontario and Dulles Intl. You'll need at least 1 connection.
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Top layover airports
Las Vegas (LAS)
Cheapest • Avg $315 (round-trip)
Charlotte (CLT)
Shortest trip • 7h 07m (one-way)
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When to travel
September
Cheapest • 51% price drop
July
Most popular
Good to know
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We hope you love your trip to Dulles Intl!
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Booking Insights
Flight Deals

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

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

Recent round-trip flight deals from Ontario to Dulles Intl

Fri, Sep 4 - Wed, Sep 9
Frontier Logo
10:17 pm - 8:04 amONT  Ontario-IAD Washington, D.C. Dulles Intl
6h 47m1 stop Las Vegas Harry Reid Intl
Frontier Logo
6:35 am - 4:59 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
13h 24m1 stop Las Vegas Harry Reid Intl
$257Frontier
Fri, Sep 25 - Wed, Sep 30
Frontier Logo
2:30 pm - 6:20 amONT  Ontario-IAD Washington, D.C. Dulles Intl
12h 50m1 stop Las Vegas Harry Reid Intl
Frontier Logo
6:00 am - 4:59 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
13h 59m1 stop Las Vegas Harry Reid Intl
$257Frontier
Thu, Sep 10 - Wed, Sep 16
Multiple Airlines Logo
8:24 pm - 6:20 amONT  Ontario-IAD Washington, D.C. Dulles Intl
6h 56m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
7:00 am - 2:16 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
10h 16m1 stop Seattle/Tacoma Intl
$285Multiple Airlines
Wed, Sep 23 - Mon, Sep 28
Multiple Airlines Logo
3:14 pm - 5:40 amONT  Ontario-IAD Washington, D.C. Dulles Intl
11h 26m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
6:00 am - 11:22 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 22m1 stop Las Vegas Harry Reid Intl
$292Multiple Airlines
Thu, Oct 29 - Mon, Nov 2
United Airlines Logo
9:25 am - 8:51 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
8h 26m1 stop San Francisco
United Airlines Logo
4:10 pm - 8:51 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 41m1 stop Denver Intl
$351United Airlines
Tue, Nov 3 - Mon, Nov 9
United Airlines Logo
7:00 am - 5:24 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 24m1 stop Chicago O'Hare Intl
United Airlines Logo
2:05 pm - 8:51 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 46m1 stop Denver Intl
$351United Airlines
Tue, Sep 15 - Sat, Sep 26
American Airlines Logo
8:25 am - 8:24 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
8h 59m1 stop Dallas/Fort Worth
American Airlines Logo
6:52 am - 1:25 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 33m1 stop Dallas/Fort Worth
$351American Airlines
Tue, Sep 15 - Sat, Oct 10
American Airlines Logo
8:25 am - 8:24 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
8h 59m1 stop Dallas/Fort Worth
American Airlines Logo
7:13 pm - 11:52 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 39m1 stop Dallas/Fort Worth
$351American Airlines
Sat, Oct 31 - Tue, Nov 3
Delta Logo
7:07 am - 5:10 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 03m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:13 am - 12:21 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 08m1 stop Salt Lake City
$351Delta
Thu, Dec 17 - Mon, Jan 4
Delta Logo
11:10 pm - 9:11 amONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 01m1 stop Atlanta Hartsfield-Jackson
Delta Logo
7:00 am - 11:27 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
7h 27m1 stop Atlanta Hartsfield-Jackson
$351Delta
Booking Insights

KAYAK's insights & trends for Ontario to Dulles Intl flights

Get data-powered insights and trends into flights from Ontario to Dulles Intl to help you find the cheapest flights, the best time to fly and much more.

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

Flight prices are below average for this route right now.

Flights to Washington, D.C. Dulles Intl Airport from Ontario usually cost between $393 and $643 in September.
The lowest price found in the past 5 days was $257 on Frontier (Sep 25-Sep 30).

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

The cheapest month for flights from Ontario to Washington, D.C. Dulles Intl Airport is September, where tickets cost $284 (return) on average. On the other hand, the most expensive months are April and January, where the average cost of round-trip tickets is $984 and $807 respectively.

Find deals

Good to know

Low season

February

Cheapest flight

$116
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly and prices are also 10% lower on average.
Flight from Ontario to Washington Dulles Airport

When to book flights from Ontario to Dulles Intl

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

FAQs for booking Ontario to Washington Dulles Airport flights

  • What is the cheapest flight from Ontario to Washington, D.C. Dulles Intl Airport?

    In the last 5 days, the lowest price for a flight from Ontario to Washington, D.C. Dulles Intl Airport was $116 for a one-way ticket and $257 for a round-trip.

  • Do I need a passport to fly between Ontario and Washington Dulles Airport?

    No

  • Which airports will I be using when flying from Ontario to Washington Dulles Airport?

    Ontario airport is called Ontario and the only airport in Washington Dulles Airport is Washington, D.C. Dulles Intl.

  • Which aircraft models fly most regularly from Ontario to Washington Dulles Airport?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Washington Dulles Airport?

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between Ontario and Washington Dulles Airport, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to Washington, D.C., Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Ontario to Washington, D.C. are Southwest and Delta. With an average price for the route of $448 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $452 and an overall rating of 7.8.

  • How does KAYAK find such low prices on flights from Ontario to Washington Dulles Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Washington Dulles Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Washington Dulles Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Washington Dulles Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington Dulles Airport with an airline and back to Ontario with another airline. Booking your flights between Ontario and IAD can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Washington Dulles Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington Dulles Airport from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

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

Information on your arrival and departure airports

Ontario (ONT)
Dulles Intl (IAD)