ONT

$61 Find Cheap Flights from Washington to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 1/29. 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.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$125
Overall average: $225
Frontier
Thu 12/11Sun 12/14
PDX - ONT • 1 stop
Cheapest non-stop
$133
Typical prices: $174-$337
Alaska Airlines
Thu 12/11Thu 12/18
SEA - ONT • Non-stop
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We hope you love your trip to Ontario!
Flight Deals
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Flight Deals

Cheap Flights from Washington to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington 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 Washington to Ontario

Thu, Dec 11 - Sun, Dec 14
Frontier Logo
12:51 pm - 2:25 pmPDX-ONT
25h 34m1 stop
Frontier Logo
5:18 pm - 8:36 amONT-PDX
15h 18m1 stop
$125Frontier
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Thu, Dec 4 - Sat, Dec 13
Frontier Logo
12:51 pm - 2:25 pmPDX-ONT
25h 34m1 stop
Frontier Logo
3:20 pm - 11:56 amONT-PDX
20h 36m1 stop
$128Frontier
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Fri, Feb 27 - Sat, Feb 28
Delta Logo
7:00 pm - 11:53 pmSEA-ONT
4h 53m1 stop
Delta Logo
7:30 am - 10:36 amONT-SEA
3h 06mnonstop
$129Delta
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Sat, Dec 13 - Sun, Dec 14
Delta Logo
5:00 pm - 9:55 pmSEA-ONT
4h 55m1 stop
Delta Logo
6:40 am - 9:45 amONT-SEA
3h 05mnonstop
$130Delta
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Thu, Dec 11 - Thu, Dec 18
Alaska Airlines Logo
8:55 pm - 11:29 pmSEA-ONT
2h 34mnonstop
Alaska Airlines Logo
6:00 am - 8:57 amONT-SEA
2h 57mnonstop
$133Alaska Airlines
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Fri, Dec 5 - Wed, Dec 17
Alaska Airlines Logo
8:55 pm - 11:29 pmSEA-ONT
2h 34mnonstop
Alaska Airlines Logo
6:00 am - 8:57 amONT-SEA
2h 57mnonstop
$138Alaska Airlines
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Mon, Dec 1 - Fri, Dec 5
Multiple Airlines Logo
9:00 am - 9:06 pmBLI-ONT
12h 06m1 stop
Multiple Airlines Logo
6:15 am - 10:14 pmONT-BLI
15h 59m1 stop
$203Multiple Airlines
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Tue, Jan 6 - Tue, Jan 13
Hawaiian Airlines Logo
12:56 pm - 6:25 pmBLI-ONT
5h 29m1 stop
Hawaiian Airlines Logo
4:03 pm - 9:20 pmONT-BLI
5h 17m1 stop
$219Hawaiian Airlines
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Fri, Dec 19 - Sun, Dec 21
Multiple Airlines Logo
6:00 am - 5:09 pmBLI-ONT
11h 09m1 stop
Multiple Airlines Logo
6:00 am - 10:27 pmONT-BLI
16h 27m1 stop
$241Multiple Airlines
Find Deal
Thu, Dec 11 - Thu, Dec 18
Hawaiian Airlines Logo
1:04 pm - 6:33 pmBLI-ONT
5h 29m1 stop
Hawaiian Airlines Logo
7:19 pm - 12:16 amONT-BLI
4h 57m1 stop
$254Hawaiian Airlines
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Useful Info

Good to know

Low seasonFebruary
Cheapest flight$61
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly with an average 11% increase in price.
Flight from Spokane to Ontario

Flights from Washington to Ontario: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Washington to Ontario 
Learn how KAYAK collects reviews and tips from users.
Verified travelerFlew with Hawaiian AirlinesSEA-ONTJun 2025
Make sure to be there on time because the bag drop off can be a little complicated and it takes quite some time to get to the gate.
Verified travelerFlew with Alaska AirlinesSEA-ONTOct 2024
SeaTac lets you make an appointment to get through security. SpotSaver. No cost. Online.

FAQs for booking flights from Washington to Ontario

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

    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 Washington to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Washington 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 Washington to Ontario?

    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 Ontario with an airline and back to Washington with another airline.

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

    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 Ontario from Washington 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 to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)