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>

$62 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

Mon, Oct 27 - Mon, Nov 3

7:30 pm - 9:52 pmPDX-ONT

2h 22mnonstop

12:05 pm - 2:31 pmONT-PDX

2h 26mnonstop

$101Frontier

Find Deal

Mon, Oct 27 - Mon, Nov 3

7:30 pm - 9:52 pmPDX-ONT

2h 22mnonstop

12:05 pm - 2:31 pmONT-PDX

2h 26mnonstop

$102Frontier

Find Deal

Wed, Oct 22 - Sat, Oct 25

9:30 pm - 11:51 pmPDX-ONT

2h 21mnonstop

7:10 am - 9:30 amONT-PDX

2h 20mnonstop

$130Alaska Airlines

Find Deal

Sat, Oct 25 - Mon, Oct 27

9:25 pm - 12:03 amSEA-ONT

2h 38mnonstop

10:30 am - 1:26 pmONT-SEA

2h 56mnonstop

$150Multiple Airlines

Find Deal

Sat, Oct 18 - Mon, Oct 20

9:25 pm - 12:03 amSEA-ONT

2h 38mnonstop

10:30 am - 1:26 pmONT-SEA

2h 56mnonstop

$151Multiple Airlines

Find Deal

Sat, Oct 18 - Sat, Oct 25

5:40 am - 12:14 pmPDX-ONT

6h 34m1 stop

11:48 am - 4:45 pmONT-PDX

4h 57m1 stop

$157Delta

Find Deal

Wed, Oct 22 - Sat, Oct 25

1:25 pm - 6:33 pmPDX-ONT

5h 08m1 stop

7:10 am - 9:30 amONT-PDX

2h 20mnonstop

$169Alaska Airlines

Find Deal

Tue, Mar 3 - Wed, Mar 4

5:45 am - 12:34 pmGEG-ONT

6h 49m1 stop

6:45 am - 1:00 pmONT-GEG

6h 15m1 stop

$251Delta

Find Deal

Sat, Feb 28 - Wed, Mar 4

1:40 pm - 6:17 pmPSC-ONT

4h 37m1 stop

6:00 am - 1:04 pmONT-PSC

7h 04m1 stop

$258Hawaiian Airlines

Find Deal

Fri, Jan 2 - Sat, Jan 10

10:17 am - 3:42 pmGEG-ONT

5h 25m1 stop

4:03 pm - 11:04 pmONT-GEG

7h 01m1 stop

$282Hawaiian Airlines

Find Deal

Cheapest round-trip

$101

Overall average: $161

Frontier

Mon 10/27Mon 11/3

PDX - ONT • Non-stop

Cheapest one-way

$62

Typical prices: $51-184

Frontier

Sun 12/14

PDX - ONT • Non-stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Ontario!

Useful Info

Low season	February
High season	October
Cheapest flight	$62

Best time to beat the crowds with an average 3% drop in price.

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

Flight from Portland 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

$62 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

Everything you should know

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