IAD - ONT
$99 Find Cheap Flights from Washington Dulles Airport to Ontario - Compare and Save
This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Ontario departing on 10/30. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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Everything you should know
Cheapest round-trip
$143
Typical prices: $324-$544
Frontier
Tue 11/13Fri 11/16
IAD - ONT • 2 stops
Cheapest one-way
$99
Typical prices: $164-$337
Frontier
Tue 10/30
IAD - ONT • 2 stops
Flight Deals
Cheap Flights from Dulles Intl to Ontario (IAD-ONT)
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.
Recent round-trip flight deals from Dulles Intl to Ontario
Fri, Nov 13 - Mon, Nov 16
9:06 pm - 10:42 amIAD Washington, D.C. Dulles Intl-ONT Ontario
16h 36m2 stops Atlanta Hartsfield-Jackson Denver Intl
6:25 am - 11:36 amONT Ontario-IAD Washington, D.C. Dulles Intl
26h 11m2 stops Denver Intl Dallas/Fort Worth
$143Frontier
Wed, Nov 18 - Wed, Dec 2
12:31 pm - 11:51 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
14h 20m2 stops Dallas/Fort Worth Denver Intl
6:00 am - 8:12 pmONT Ontario-IAD Washington, D.C. Dulles Intl
11h 12m2 stops Denver Intl Dallas/Fort Worth
$178Frontier
Wed, Nov 18 - Wed, Dec 2
7:46 am - 3:13 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
10h 27m1 stop Seattle/Tacoma Intl
6:00 am - 8:12 pmONT Ontario-IAD Washington, D.C. Dulles Intl
11h 12m2 stops Denver Intl Dallas/Fort Worth
$277Multiple Airlines
Thu, Nov 12 - Tue, Nov 17
12:31 pm - 7:08 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 37m1 stop Dallas/Fort Worth
4:09 pm - 5:44 amONT Ontario-IAD Washington, D.C. Dulles Intl
10h 35m1 stop Seattle/Tacoma Intl
$302Multiple Airlines
Tue, Feb 16 - Sat, Feb 20
4:08 pm - 8:20 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
7h 12m1 stop Denver Intl
6:35 pm - 7:05 amONT Ontario-IAD Washington, D.C. Dulles Intl
9h 30m1 stop San Francisco
$351United Airlines
Sat, Oct 17 - Sat, Oct 31
4:02 pm - 10:49 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 47m1 stop Chicago O'Hare Intl
6:00 am - 4:08 pmONT Ontario-IAD Washington, D.C. Dulles Intl
7h 08m1 stop San Francisco
$351United Airlines
Sat, Oct 31 - Tue, Nov 3
3:08 pm - 9:11 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 03m1 stop Dallas/Fort Worth
12:42 pm - 11:30 pmONT Ontario-IAD Washington, D.C. Dulles Intl
7h 48m1 stop Dallas/Fort Worth
$351American Airlines
Wed, Jan 27 - Mon, Feb 1
7:00 am - 1:25 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 25m1 stop Dallas/Fort Worth
12:45 pm - 10:55 pmONT Ontario-IAD Washington, D.C. Dulles Intl
7h 10m1 stop Dallas/Fort Worth
$351American Airlines
Wed, Jan 27 - Sat, Jan 30
7:00 am - 11:27 amIAD Washington, D.C. Dulles Intl-ONT Ontario
7h 27m1 stop Atlanta Hartsfield-Jackson
1:00 pm - 11:46 pmONT Ontario-IAD Washington, D.C. Dulles Intl
7h 46m1 stop Salt Lake City
$351Delta
Sat, Nov 14 - Wed, Nov 18
7:00 am - 12:17 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
8h 17m1 stop Salt Lake City
1:15 pm - 11:47 pmONT Ontario-IAD Washington, D.C. Dulles Intl
7h 32m1 stop Salt Lake City
$351Delta
Recent one-way flight deals from Dulles Intl to Ontario
Fri, Oct 30
9:06 pm - 10:42 amIAD Washington, D.C. Dulles Intl-ONT Ontario
16h 36m2 stops Atlanta Hartsfield-Jackson Denver Intl
$99Frontier
Tue, Nov 3
8:05 am - 11:51 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
18h 46m2 stops Atlanta Hartsfield-Jackson Denver Intl
$112Frontier
Tue, Jan 12
10:05 am - 5:47 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
10h 42m1 stop San Francisco
$176United Airlines
Mon, Nov 2
5:38 pm - 10:48 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
8h 10m1 stop San Francisco
$176United Airlines
Wed, Feb 10
5:07 pm - 11:13 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 06m1 stop Dallas/Fort Worth
$176American Airlines
Tue, Oct 27
6:13 am - 12:36 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 23m1 stop Salt Lake City
$176Delta
Sat, Mar 27
6:00 am - 11:27 amIAD Washington, D.C. Dulles Intl-ONT Ontario
8h 27m1 stop Atlanta Hartsfield-Jackson
$176Delta
Wed, Oct 28
7:02 am - 1:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 14m1 stop Seattle/Tacoma Intl
$176Alaska Airlines
Tue, Oct 27
7:02 am - 1:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 14m1 stop Seattle/Tacoma Intl
$176Alaska Airlines
Wed, Dec 30
7:20 am - 1:30 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 10m1 stop Dallas/Fort Worth
$201American Airlines
Recent last minute flight deals from Dulles Intl to Ontario
Sat, Oct 3 - Sat, Oct 17
6:00 am - 4:34 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
13h 34m1 stop Las Vegas Harry Reid Intl
5:25 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl
9h 55m1 stop Las Vegas Harry Reid Intl
$320Frontier
Sat, Oct 3 - Thu, Oct 22
6:00 am - 4:34 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
13h 34m1 stop Las Vegas Harry Reid Intl
3:38 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl
11h 42m1 stop Las Vegas Harry Reid Intl
$320Frontier
Sat, Oct 3 - Wed, Oct 7
9:38 am - 6:00 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
11h 22m1 stop Seattle/Tacoma Intl
2:30 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl
12h 50m1 stop Las Vegas Harry Reid Intl
$493Multiple Airlines
Sat, Oct 3 - Sun, Oct 4
7:02 am - 1:16 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 14m1 stop Seattle/Tacoma Intl
8:24 pm - 6:20 amONT Ontario-IAD Washington, D.C. Dulles Intl
6h 56m1 stop Las Vegas Harry Reid Intl
$546Multiple Airlines
Thu, Oct 1 - Sat, Oct 31
6:35 am - 12:18 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
8h 43m1 stop San Francisco
6:00 am - 4:08 pmONT Ontario-IAD Washington, D.C. Dulles Intl
7h 08m1 stop San Francisco
$557United Airlines
Sat, Oct 3 - Wed, Oct 7
6:52 am - 1:25 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 33m1 stop Dallas/Fort Worth
7:34 pm - 8:44 amONT Ontario-IAD Washington, D.C. Dulles Intl
10h 10m2 stops Phoenix Sky Harbor Intl Charlotte Douglas
$592American Airlines
Sat, Oct 3 - Tue, Oct 6
6:52 am - 1:25 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
9h 33m1 stop Dallas/Fort Worth
6:15 am - 8:46 pmONT Ontario-IAD Washington, D.C. Dulles Intl
11h 31m2 stops Phoenix Sky Harbor Intl Charlotte Douglas
$592American Airlines
Mon, Oct 5 - Wed, Oct 7
6:00 am - 11:09 amIAD Washington, D.C. Dulles Intl-ONT Ontario
8h 09m1 stop Atlanta Hartsfield-Jackson
12:16 pm - 12:42 amONT Ontario-IAD Washington, D.C. Dulles Intl
9h 26m1 stop Atlanta Hartsfield-Jackson
$669Delta
Sat, Oct 3 - Fri, Oct 16
6:00 am - 11:07 amIAD Washington, D.C. Dulles Intl-ONT Ontario
8h 07m1 stop Atlanta Hartsfield-Jackson
11:19 pm - 5:33 pmONT Ontario-IAD Washington, D.C. Dulles Intl
15h 14m2 stops Atlanta Hartsfield-Jackson New York John F Kennedy Intl
$671Delta
Wed, Sep 30 - Wed, Oct 7
3:47 pm - 10:49 pmIAD Washington, D.C. Dulles Intl-ONT Ontario
10h 02m1 stop Chicago O'Hare Intl
8:03 am - 12:30 amONT Ontario-IAD Washington, D.C. Dulles Intl
13h 27m2 stops San Francisco Houston George Bush Intcntl
$722United 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.
Prices
Airlines
Layovers
How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Ontario?
This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to Ontario departing in november.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?
KAYAK internal proprietary data takes all prices for each month over the last 12 months for round-trip flights from Washington, D.C. Dulles Intl Airport to Ontario, removes the top 0.1% to account for outliers and then takes the median of all values for each month.•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.
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 $143, on Frontier.
What’s the most popular layover airport when flying from Washington, D.C. Dulles Intl Airport to Ontario?
KAYAK data for 1-stop round-trips over the past 3 months. Only counts itineraries with the same layover on both legs.Denver Intl (DEN) is the most popular layover for the Washington, D.C. Dulles Intl Airport to Ontario route. 31% of KAYAK users who booked 1-stop round-trips over the past 3 months connected via DEN.
What is the cheapest layover airport when flying from Washington, D.C. Dulles Intl Airport to Ontario?
Flights via Salt Lake City (SLC) offer the most affordable fares, with an average round-trip price of $273. Based on KAYAK data over the past 3 months.
Key details for Washington, D.C. Dulles Intl Airport to Ontario flights
Low season | February |
|---|---|
High season | July |
Cheapest flight | $99 |
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
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.
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.
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.More options for your flight from Dulles Intl to Ontario
Complete your trip to Ontario with a hotel stay or car rental
Information on your arrival and departure airports
Cabin class types available on flights to Ontario
Cabin classes available on flights to Ontario. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
Find direct flights to and from Dulles Intl and Ontario
Flights from domestic origins to Ontario
Flights to other popular destinations
The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.