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ONT - IAD

$80 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
$252
Typical prices: $360-$624
Frontier
Fri 11/2Mon 11/5
ONT - IAD • 1 stop
Cheapest one-way
$80
Typical prices: $185-$369
Frontier
Sun 11/4
ONT - IAD • 2 stops
Nonstop flights
Not available
There are currently no direct flights between Ontario and Washington, D.C. Dulles Intl Airport. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
September
Cheapest • 36% price drop
June
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Las Vegas Harry Reid Intl (LAS)
Cheapest • Avg $327 (round-trip)
Denver Intl (DEN)
Shortest trip • 7h 12m (one-way)
Insights
Insights
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We hope you love your trip to Washington, D.C. Dulles Intl Airport!
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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

Mon, Nov 2 - Thu, Nov 5
Frontier Logo
8:03 pm - 11:36 amONT  Ontario-IAD Washington, D.C. Dulles Intl
12h 33m1 stop Dallas/Fort Worth
Frontier Logo
12:31 pm - 7:08 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 37m1 stop Dallas/Fort Worth
$252Frontier
Mon, Nov 23 - Thu, Nov 26
Frontier Logo
2:01 pm - 5:10 amONT  Ontario-IAD Washington, D.C. Dulles Intl
12h 09m1 stop Las Vegas Harry Reid Intl
Frontier Logo
1:09 pm - 7:36 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 27m1 stop Las Vegas Harry Reid Intl
$252Frontier
Mon, Nov 2 - Tue, Nov 10
Multiple Airlines Logo
8:03 pm - 11:36 amONT  Ontario-IAD Washington, D.C. Dulles Intl
12h 33m1 stop Dallas/Fort Worth
Multiple Airlines Logo
7:46 am - 3:13 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
10h 27m1 stop Seattle/Tacoma Intl
$279Multiple Airlines
Mon, Oct 19 - Tue, Oct 27
Multiple Airlines Logo
8:35 pm - 6:20 amONT  Ontario-IAD Washington, D.C. Dulles Intl
6h 45m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
7:02 am - 1:16 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 14m1 stop Seattle/Tacoma Intl
$302Multiple Airlines
Tue, Mar 2 - Tue, Mar 9
United Airlines Logo
1:00 pm - 11:13 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 13m1 stop Denver Intl
United Airlines Logo
5:55 pm - 11:06 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 11m1 stop San Francisco
$351United Airlines
Wed, Oct 28 - Sat, Oct 31
United Airlines Logo
1:29 pm - 11:15 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
6h 46m1 stop Denver Intl
United Airlines Logo
2:38 pm - 8:15 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 37m1 stop San Francisco
$351United Airlines
Thu, Jan 28 - Tue, Feb 2
American Airlines Logo
6:00 am - 4:17 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 17m1 stop Dallas/Fort Worth
American Airlines Logo
12:30 pm - 6:51 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 21m1 stop Dallas/Fort Worth
$351American Airlines
Wed, Nov 11 - Sat, Nov 14
American Airlines Logo
12:42 pm - 11:30 pmONT  Ontario-IAD Washington, D.C. Dulles Intl
7h 48m1 stop Dallas/Fort Worth
American Airlines Logo
7:18 am - 1:31 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
9h 13m1 stop Dallas/Fort Worth
$351American Airlines
Mon, Nov 9 - Wed, Nov 11
Delta Logo
12:18 pm - 12:41 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 23m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:00 am - 11:03 amIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 03m1 stop Atlanta Hartsfield-Jackson
$351Delta
Sat, Nov 7 - Sat, Nov 14
Delta Logo
12:16 pm - 12:42 amONT  Ontario-IAD Washington, D.C. Dulles Intl
9h 26m1 stop Atlanta Hartsfield-Jackson
Delta Logo
7:00 am - 12:17 pmIAD  Washington, D.C. Dulles Intl-ONT Ontario
8h 17m1 stop Salt Lake City
$351Delta
Booking Insights

Price, demand and travel trends for Ontario to Washington, D.C. Dulles Intl Airport 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 Ontario to Washington, D.C. Dulles Intl Airport?

Round-trip flights from Ontario to Washington, D.C. Dulles Intl Airport typically range from $360 to $624. The lowest price found in the past 5 days was $252, on Frontier.

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

Based on deals KAYAK users found in the last 12 months, Saturday is the cheapest day of the week to fly from Ontario to Washington, D.C. Dulles Intl Airport. It’s 21% cheaper than the average day, while Monday is the most expensive, with prices 43% higher.

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

•September is the cheapest month to fly from Ontario to Washington, D.C. Dulles Intl Airport at $284 round-trip.
•April ($984) and November ($709) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 246% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

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

Low season

January

Cheapest flight

$80
Beat the crowds with an average 46% drop in travelers.
One-way flight from Ontario to Washington, D.C. Dulles Intl 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

Your Ontario to Washington, D.C. Dulles Intl Airport 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 Ontario to Washington, D.C. Dulles Intl Airport?

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

    • Economy Class
    • First Class

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

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

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

    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 Ontario to Washington, D.C. Dulles Intl Airport flight?

    Round-trip flights from Ontario to Washington, D.C. Dulles Intl Airport range from $360 to $624, with an average of $447 over the past 12 months. Anything below $360 counts as a good deal.

  • Have flight prices from Ontario to Washington, D.C. Dulles Intl Airport 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 $252 to $2,480. That means the highest observed fare was about 10x higher than the lowest one.

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

    One-way fares from Ontario to Washington, D.C. Dulles Intl Airport are currently lower than usual. Average one-way flight prices are about $157, which is 38% below the typical average for this route.

  • What car rental options are available at Washington, D.C. Dulles Intl Airport (IAD)?

    Washington, D.C. Dulles Intl Airport (IAD) hosts 5 major car rental companies, with daily rates starting from around $24 for economy cars. Top options include:

    • Dollar
    • Budget
    • Hertz
    • Sixt
    • Thrifty

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

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

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

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

    • Denver Intl (DEN) - 39% of one-stop connections
    • Dallas/Fort Worth (DFW) - 23% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 9% of one-stop connections
    • San Francisco (SFO) - 7% of one-stop connections

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

    Yes. Flexible dates can save you up to 45% on flights from Ontario to Washington, D.C. Dulles Intl Airport. Saturday is the cheapest departure day at $357 round-trip on average, while Monday is the most expensive at $643, a difference of $286.

    Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

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

    Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time at 7h 12m, compared with 7h 21m via Charlotte Douglas (CLT) and 7h 47m via Chicago O'Hare Intl (ORD).

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

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

  • What popular places can I visit in Washington, D.C. Dulles Intl Airport?

    Some of the most popular sights in Washington, D.C. Dulles Intl Airport are Walter E. Washington Convention Center, National Mall and Capital One Arena. These are among the most viewed places in Washington, D.C. Dulles Intl Airport on KAYAK.

Your guide to booking Ontario to Washington, D.C. Dulles Intl Airport 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 Saturday departure and avoid flying on Monday. On this route, Saturday flights average $357, about $286 less than Monday fares (44% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Ontario to Washington, D.C. Dulles Intl Airport trip for September. Fares historically average $284 round-trip in that month - typically $700 less than the most expensive month, which is April (based on the last 12 months).

More options for your flight from Ontario to Dulles Intl

Complete your trip to Washington, D.C. with a hotel stay or car rental

Car rentals in Washington, D.C.
Hotels in Washington, D.C.
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