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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$63 CHEAP FLIGHTS from Washington to Ontario

ONT

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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.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Washington to Ontario

Tue, Aug 26 - Wed, Aug 27

8:42 pm - 11:24 pmSEA-ONT

2h 42mnonstop

5:03 pm - 7:53 pmONT-SEA

2h 50mnonstop

$122Frontier

Find Deal

Mon, Oct 13 - Mon, Oct 20

6:43 pm - 9:05 pmPDX-ONT

2h 22mnonstop

8:25 am - 10:51 amONT-PDX

2h 26mnonstop

$123Frontier

Find Deal

Wed, Oct 8 - Sat, Oct 11

6:15 am - 10:15 amPDX-ONT

4h 00m1 stop

4:55 pm - 10:15 pmONT-PDX

5h 20m1 stop

$126Southwest

Find Deal

Thu, Sep 11 - Sat, Sep 13

5:25 am - 12:40 pmPDX-ONT

7h 15m1 stop

1:55 pm - 7:35 pmONT-PDX

5h 40m1 stop

$132Southwest

Find Deal

Wed, Sep 3 - Wed, Sep 10

7:55 am - 10:44 amSEA-ONT

2h 49mnonstop

3:06 pm - 5:46 pmONT-SEA

2h 40mnonstop

$157Alaska Airlines

Find Deal

Tue, Oct 14 - Sat, Oct 18

7:40 am - 10:01 amPDX-ONT

2h 21mnonstop

7:10 am - 9:30 amONT-PDX

2h 20mnonstop

$157Alaska Airlines

Find Deal

Sat, Sep 13 - Mon, Sep 15

5:50 pm - 10:40 pmPDX-ONT

4h 50m1 stop

6:00 am - 1:00 pmONT-PDX

7h 00m1 stop

$161Delta

Find Deal

Thu, Sep 4 - Fri, Sep 5

5:13 am - 11:56 amPDX-ONT

6h 43m1 stop

1:10 pm - 7:23 pmONT-PDX

6h 13m1 stop

$163American Airlines

Find Deal

Wed, Sep 3 - Sun, Sep 7

8:05 am - 10:50 amSEA-ONT

2h 45mnonstop

6:05 pm - 8:50 pmONT-SEA

2h 45mnonstop

$177Delta

Find Deal

Fri, Oct 17 - Mon, Oct 20

8:05 am - 6:42 pmBLI-ONT

10h 37m2 stops

1:00 pm - 12:06 amONT-BLI

11h 06m2 stops

$503American Airlines

Find Deal

Useful Info

Low season	February
High season	August
Cheapest flight	$63

Best time to beat the crowds with an average 5% drop in price.

Most popular time to fly and prices are also 11% lower on average.

Flight from Seattle to Ontario

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.

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

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in Ontario

Ontario (ONT)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

ONT

$63 Find Cheap Flights from Washington to Ontario

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

Cheap Flights from Washington to Ontario

Recent round-trip flight deals from Washington to Ontario

Recent one-way flight deals from Washington to Ontario

Recent last minute flight deals from Washington to Ontario

Recent direct flight deals from Washington to Ontario

Good to know

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

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

Cabin class types available on flights to Washington

Complete your trip to Ontario with a hotel stay or car rental

Find direct flights for Ontario

Flights to other popular destinations

Flights from domestic origins to Ontario

Choose which airport to fly into in Ontario

Find deals for your return flight