What is the cheapest airline that flies from Ontario to Washington?

Alaska Airlines, United Airlines, and Delta are the most popular carriers operating from Ontario to Washington

How many flights depart from Ontario to State of Washington on average per week?

99 flights are operational weekly from Ontario to State of Washington as of March 2026. The most popular departure day for this route is Wed, with 20% of flights per week taking off on this day.

What airlines fly to State of Washington?

Alaska Airlines, Frontier and Delta are the top three most popular airlines that fly to State of Washington from Ontario according to our data. Alaska Airlines is the first choice among our users, with 47% of people opting to fly with this airline when traveling to State of Washington. Keep in mind that there are 11 different airlines that fly to State of Washington on a routine basis, so you have a few additional options to choose from.

How many flights depart from Ontario to State of Washington on average per day?

The number of flights available between Ontario and State of Washington is 14 per day as of March 2026. The most frequent departure time is 7:00AM, with 65% of daily flights leaving at noon.

When did momondo last update prices for flights from Ontario Airport to Washington?

Prices for flights from Ontario Airport to Washington were last updated today.

How many operators does momondo search for flights from Ontario Airport to Washington?

As of March 2026, there are 6 operators available to choose from for flights from Ontario Airport to Washington.

How old do you have to be to fly from Ontario Airport to Washington?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Washington.

What documentation or ID do you need to fly to Washington?

The travel and health documents required for your trip to Washington can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$66 Cheap Flights from Ontario to Washington in 2026

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:59 pm - 10:50 pm

ONT

SEA

2h 51mnonstop

7:05 am - 9:45 am

SEA

ONT

2h 40mnonstop

$117Alaska Airlines

Thu, Apr 23 - Sat, Apr 25

2:44 pm - 5:36 pm

ONT

SEA

2h 52mnonstop

11:00 am - 1:44 pm

SEA

ONT

2h 44mnonstop

$122Frontier

Thu, May 21 - Mon, May 25

2:44 pm - 5:36 pm

ONT

SEA

2h 52mnonstop

11:00 am - 1:44 pm

SEA

ONT

2h 44mnonstop

$124Frontier

Thu, May 21 - Mon, May 25

5:55 pm - 8:55 pm

ONT

SEA

3h 00mnonstop

5:35 am - 12:14 pm

SEA

ONT

6h 39m

1 stop

$127Delta

Wed, Apr 15 - Wed, Apr 22

3:26 pm - 6:17 pm

ONT

SEA

2h 51mnonstop

7:05 am - 9:45 am

SEA

ONT

2h 40mnonstop

$137Alaska Airlines

Fri, Apr 24 - Sun, Apr 26

3:00 pm - 8:05 pm

ONT

SEA

5h 05m

1 stop

10:55 am - 4:25 pm

SEA

ONT

5h 30m

1 stop

$146Southwest

Thu, Apr 23 - Mon, Apr 27

6:00 am - 8:55 am

ONT

SEA

2h 55mnonstop

4:36 pm - 11:44 pm

SEA

ONT

7h 08m

1 stop

$147Delta

Wed, Apr 8 - Tue, Apr 14

5:30 am - 11:45 am

ONT

PDX

6h 15m

2 stops

12:45 pm - 7:10 pm

PDX

ONT

6h 25m

1 stop

$172Southwest

Sat, Apr 18 - Wed, Apr 22

1:50 pm - 8:54 pm

ONT

PSC

7h 04m

1 stop

5:05 am - 12:49 pm

PSC

ONT

7h 44m

1 stop

$307United Airlines

Fri, Mar 13 - Tue, Mar 17

6:15 am - 11:36 am

ONT

PSC

5h 21m

1 stop

3:05 pm - 10:57 pm

PSC

ONT

7h 52m

1 stop

$327United Airlines

Wed, Mar 18 - Sun, Mar 22

Delta flights from Ontario to State of Washington

Our best Delta deals on Ontario to State of Washington flight tickets

Delta

Apr 15

ONT5:55 pmOntario

3h 00m

SEA8:55 pmSeattle/Tacoma Intl

Apr 22

SEA5:35 amSeattle/Tacoma Intl

6h 39m

1 stop

ONT12:14 pmOntario

$127

Delta

Apr 8

ONT6:00 amOntario

2h 55m

SEA8:55 amSeattle/Tacoma Intl

Apr 14

SEA4:36 pmSeattle/Tacoma Intl

7h 08m

1 stop

ONT11:44 pmOntario

$147

Delta

Apr 16

ONT5:55 pmOntario

3h 00m

SEA8:55 pmSeattle/Tacoma Intl

Apr 20

SEA8:25 amSeattle/Tacoma Intl

2h 48m

ONT11:13 amOntario

$158

Southwest flights from Ontario to State of Washington

Our best Southwest deals on Ontario to State of Washington flight tickets

Southwest

Apr 23

ONT3:00 pmOntario

5h 05m

1 stop

SEA8:05 pmSeattle/Tacoma Intl

Apr 27

SEA10:55 amSeattle/Tacoma Intl

5h 30m

1 stop

ONT4:25 pmOntario

$146

Southwest

May 9

ONT3:35 pmOntario

7h 25m

1 stop

SEA11:00 pmSeattle/Tacoma Intl

May 11

SEA5:00 amSeattle/Tacoma Intl

5h 25m

1 stop

ONT10:25 amOntario

$151

Southwest

Apr 15

ONT3:45 pmOntario

7h 10m

2 stops

SEA10:55 pmSeattle/Tacoma Intl

Apr 22

SEA5:30 amSeattle/Tacoma Intl

4h 55m

1 stop

ONT10:25 amOntario

$156

Fly from

Fly to

Route

Depart

Return

Price

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 4/23

7:59 pm-10:50 pm

Nonstop2h 51m

Seattle/Tacoma Intl

Sat 4/25

7:05 am-9:45 am

Nonstop2h 40m

$117

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 5/21

2:44 pm-5:36 pm

Nonstop2h 52m

Seattle/Tacoma Intl

Mon 5/25

11:00 am-1:44 pm

Nonstop2h 44m

$122

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 5/21

2:44 pm-5:36 pm

Nonstop2h 52m

Seattle/Tacoma Intl

Mon 5/25

11:00 am-1:44 pm

Nonstop2h 44m

$124

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 4/15

5:55 pm-8:55 pm

Nonstop3h 00m

Seattle/Tacoma Intl

Wed 4/22

5:35 am-12:14 pm

1 stop6h 39m

$127

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 4/24

3:26 pm-6:17 pm

Nonstop2h 51m

Seattle/Tacoma Intl

Sun 4/26

7:05 am-9:45 am

Nonstop2h 40m

$137

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 4/23

3:00 pm-8:05 pm

1 stop5h 05m

Seattle/Tacoma Intl

Mon 4/27

10:55 am-4:25 pm

1 stop5h 30m

$146

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 4/8

6:00 am-8:55 am

Nonstop2h 55m

Seattle/Tacoma Intl

Tue 4/14

4:36 pm-11:44 pm

1 stop7h 08m

$147

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 4/18

5:30 am-11:45 am

2 stops6h 15m

Portland

Wed 4/22

12:45 pm-7:10 pm

1 stop6h 25m

$172

OntarioPasco

ONT - PSC

ONTPSC

Ontario

Fri 3/13

1:50 pm-8:54 pm

1 stop7h 04m

Pasco Tri Cities

Tue 3/17

5:05 am-12:49 pm

1 stop7h 44m

$307

OntarioPasco

ONT - PSC

ONTPSC

Ontario

Wed 3/18

6:15 am-11:36 am

1 stop5h 21m

Pasco Tri Cities

Sun 3/22

3:05 pm-10:57 pm

1 stop7h 52m

$327

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Ontario to State of Washington

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to State of Washington?

The month of January is, on average, the cheapest month to fly to State of Washington from Ontario, with most prices found around $197. If you aren’t able to travel to State of Washington during the month of January, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $197.

What is the cheapest day to depart on your flight to State of Washington?

The cheapest day to depart from Ontario to State of Washington is on a Saturday. Travelers who choose to depart for State of Washington on a Saturday will often find tickets for as low as $249. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to State of Washington for around $307.

What is the cheapest time of day to depart on your flight to State of Washington?

The cheapest time of day to fly to State of Washington is in the morning when flights can be purchased for as low as $261. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $290 on average. Flights to State of Washington from Ontario in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Ontario to Washington flight route?

Fly from Ontario to Seattle/Tacoma Intl for the best Ontario - Washington flight prices

How far in advance should I book a flight to State of Washington?

You are more likely to see cheaper flights to State of Washington from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to State of Washington for around $223 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to State of Washington from Ontario for as low as $177 on momondo.

What cabin class options are available on Ontario to Washington flights?

There are 4 cabin classes available to choose from on Ontario to Washington flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to State of Washington flights?

You could potentially save up to 11% on your flight if you consider stops on a Ontario to State of Washington flight.

Cheap Ontario to State of Washington flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to State of Washington

Best Price Found	$168
Fastest flight time	2h 16m
Direct flights	Every day
Airports in State of Washington	96 airports

The best one-way flight to State of Washington from Ontario in the past 72 hours is $168. The best round-trip flight deal from Ontario to State of Washington found on momondo in the last 72 hours is $203.

The fastest flight from Ontario to State of Washington takes 2h 16m

Direct flights go from Ontario to State of Washington every day.

There are 96 airports in State of Washington. From Ontario there are direct flights to Portland (PDX).

Search flight deals

When did momondo last update prices for flights from Ontario Airport to Washington?
Prices for flights from Ontario Airport to Washington were last updated today.
How many operators does momondo search for flights from Ontario Airport to Washington?
As of March 2026, there are 6 operators available to choose from for flights from Ontario Airport to Washington.
How old do you have to be to fly from Ontario Airport to Washington?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Washington.
What documentation or ID do you need to fly to Washington?
The travel and health documents required for your trip to Washington can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Ontario to State of Washington?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Ontario to State of Washington is Boeing 737-800 Passenger/BBJ2 (winglets) (28.66% of total bookings). The next most popular plane models are Boeing 737-900 Passenger/BBJ3 (winglets) (9.51%), Airbus A320neo (8.75%), and Boeing 737 MAX 9 (6.21%).

Best airlines flying from Ontario to State of Washington

Compare and see reviews for airlines that fly from Ontario to State of Washington with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $83	Free Cancellation	Rating 5.7 3,041 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $88	Free Cancellation	Rating 7.8 2,836 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $99	Free Cancellation	Rating 7.9 8,245 reviews	Search Delta flights
Alaska Airlines	PriceFrom $139	Free Cancellation	Rating 8.0 11,982 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $150	Free Cancellation	Rating 8.0 4,305 reviews	Search Southwest flights
United Airlines	PriceFrom $258	Free Cancellation	Rating 7.4 9,381 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Washington?

Finding the right flight to Washington from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Washington quick and easy, saving you time and money.

Can I find flights from Ontario to Washington with flexible booking policies on momondo?

momondo does allow users to show only those flights to Washington from Ontario which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ontario to Washington?

Once you have performed a search for Ontario to Washington flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ontario to Washington right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Washington from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your State of Washington trip

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Cheap flights from Ontario to Washington from $67

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Washington departing on 4/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Delta flights from Ontario to State of Washington

Our best Delta deals on Ontario to State of Washington flight tickets

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Our best Southwest deals on Ontario to State of Washington flight tickets

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How to get the cheapest flight ticket from Ontario to State of Washington

What is the cheapest month to fly to State of Washington?

What is the cheapest day to depart on your flight to State of Washington?

What is the cheapest time of day to depart on your flight to State of Washington?

What is the cheapest Ontario to Washington flight route?

How far in advance should I book a flight to State of Washington?

What cabin class options are available on Ontario to Washington flights?

Can stopping save me money on Ontario to State of Washington flights?

What is the cheapest airline that flies from Ontario to Washington?

What airlines fly to State of Washington?

How many flights depart from Ontario to State of Washington on average per day?

How many flights depart from Ontario to State of Washington on average per week?

Cheap Ontario to State of Washington flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to State of Washington

Best Price Found

Fastest flight time

Direct flights

Airports in State of Washington

Best airlines flying from Ontario to State of Washington

Compare and see reviews for airlines that fly from Ontario to State of Washington with momondo

Why use momondo?

An easier way to manage your State of Washington trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Washington

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