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

127 flights are operational weekly from Ontario to State of Washington as of April 2026. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.

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 18 per day as of April 2026. The most frequent departure time is 11:00AM, with 68% of daily flights leaving at noon.

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

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

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 50% 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.

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 April 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.

$75 Cheap Flights from Ontario to Washington in 2026

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Find the cheapest flights from Ontario to Washington

Round-trip

One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

4:04 pm - 7:05 pm

ONT

SEA

3h 01mnonstop

7:50 pm - 11:49 pm

SEA

ONT

27h 59m

1 stop

$140Frontier

Sat, Jun 6 - Sun, Jun 7

4:04 pm - 7:05 pm

ONT

SEA

3h 01mnonstop

7:50 pm - 11:49 pm

SEA

ONT

27h 59m

1 stop

$141Frontier

Sat, Jun 6 - Sun, Jun 7

11:51 am - 9:04 am

ONT

BLI

21h 13m

1 stop

3:47 pm - 3:08 pm

BLI

ONT

23h 21m

1 stop

$164Multiple Airlines

Thu, Jun 4 - Mon, Jun 8

4:39 pm - 9:11 am

ONT

BLI

16h 32m

1 stop

1:07 pm - 3:09 pm

BLI

ONT

26h 02m

1 stop

$187Multiple Airlines

Wed, May 27 - Sun, May 31

11:15 am - 1:39 pm

ONT

PDX

2h 24mnonstop

9:31 pm - 11:56 pm

PDX

ONT

2h 25mnonstop

$197Alaska Airlines

Wed, May 20 - Wed, May 27

3:45 pm - 9:00 pm

ONT

PDX

5h 15m

1 stop

9:00 am - 12:45 pm

PDX

ONT

3h 45m

1 stop

$202Southwest

Wed, Jun 3 - Sat, Jun 6

11:15 am - 1:39 pm

ONT

PDX

2h 24mnonstop

8:00 am - 10:21 am

PDX

ONT

2h 21mnonstop

$207Alaska Airlines

Wed, May 20 - Tue, May 26

6:45 am - 11:45 am

ONT

PDX

5h 00m

1 stop

6:30 am - 11:55 am

PDX

ONT

5h 25m

1 stop

$212Southwest

Sat, May 23 - Tue, May 26

5:50 pm - 11:56 pm

ONT

PSC

6h 06m

1 stop

6:20 am - 12:35 pm

PSC

ONT

6h 15m

1 stop

$299Delta

Tue, May 19 - Wed, May 27

6:45 am - 2:50 pm

ONT

PSC

8h 05m

1 stop

5:30 pm - 10:32 pm

PSC

ONT

5h 02m

1 stop

$314Delta

Thu, May 28 - Thu, Jun 4

Frontier flights from Ontario to State of Washington

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

Frontier

Jun 6

ONT4:04 pmOntario

3h 01m

SEA7:05 pmSeattle/Tacoma Intl

Jun 7

SEA7:50 pmSeattle/Tacoma Intl

27h 59m

1 stop

ONT11:49 pmOntario

$140

Frontier

Jun 6

ONT4:04 pmOntario

3h 01m

SEA7:05 pmSeattle/Tacoma Intl

Jun 7

SEA7:50 pmSeattle/Tacoma Intl

27h 59m

1 stop

ONT11:49 pmOntario

$141

Frontier

Jun 6

ONT4:04 pmOntario

3h 01m

SEA7:05 pmSeattle/Tacoma Intl

Jun 10

SEA11:53 amSeattle/Tacoma Intl

2h 46m

ONT2:39 pmOntario

$142

Southwest flights from Ontario to State of Washington

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

Southwest

Jun 3

ONT3:45 pmOntario

5h 15m

1 stop

PDX9:00 pmPortland

Jun 6

PDX9:00 amPortland

3h 45m

1 stop

ONT12:45 pmOntario

$202

Southwest

May 23

ONT6:45 amOntario

5h 00m

1 stop

PDX11:45 amPortland

May 26

PDX6:30 amPortland

5h 25m

1 stop

ONT11:55 amOntario

$212

Southwest

May 29

ONT4:25 pmOntario

5h 45m

1 stop

PDX10:10 pmPortland

Jun 1

PDX6:25 amPortland

4h 55m

1 stop

ONT11:20 amOntario

$227

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 6/6

4:04 pm-7:05 pm

Nonstop3h 01m

Seattle/Tacoma Intl

Sun 6/7

7:50 pm-11:49 pm

1 stop27h 59m

$140

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 6/6

4:04 pm-7:05 pm

Nonstop3h 01m

Seattle/Tacoma Intl

Sun 6/7

7:50 pm-11:49 pm

1 stop27h 59m

$141

OntarioBellingham

ONT - BLI

ONTBLI

Ontario

Thu 6/4

11:51 am-9:04 am

1 stop21h 13m

Bellingham

Mon 6/8

3:47 pm-3:08 pm

1 stop23h 21m

$164

OntarioBellingham

ONT - BLI

ONTBLI

Ontario

Wed 5/27

4:39 pm-9:11 am

1 stop16h 32m

Bellingham

Sun 5/31

1:07 pm-3:09 pm

1 stop26h 02m

$187

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 5/20

11:15 am-1:39 pm

Nonstop2h 24m

Portland

Wed 5/27

9:31 pm-11:56 pm

Nonstop2h 25m

$197

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 6/3

3:45 pm-9:00 pm

1 stop5h 15m

Portland

Sat 6/6

9:00 am-12:45 pm

1 stop3h 45m

$202

Quickest round-trip

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 5/20

11:15 am-1:39 pm

Nonstop2h 24m

Portland

Tue 5/26

8:00 am-10:21 am

Nonstop2h 21m

$207

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 5/23

6:45 am-11:45 am

1 stop5h 00m

Portland

Tue 5/26

6:30 am-11:55 am

1 stop5h 25m

$212

OntarioPasco

ONT - PSC

ONTPSC

Ontario

Tue 5/19

5:50 pm-11:56 pm

1 stop6h 06m

Pasco Tri Cities

Wed 5/27

6:20 am-12:35 pm

1 stop6h 15m

$299

OntarioPasco

ONT - PSC

ONTPSC

Ontario

Thu 5/28

6:45 am-2:50 pm

1 stop8h 05m

Pasco Tri Cities

Thu 6/4

5:30 pm-10:32 pm

1 stop5h 02m

$314

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 October is, on average, the cheapest month to fly to State of Washington from Ontario, with most prices found around $37. If you aren’t able to travel to State of Washington during the month of October, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $49.

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 $250. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to State of Washington for around $319.

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 afternoon when flights can be purchased for as low as $268. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $303 on average. Flights to State of Washington from Ontario at noon 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 from Ontario to 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 $235 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 $185 on momondo.

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

You could potentially save up to 30% 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	$163
Fastest flight time	2h 15m
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 $163. The best round-trip flight deal from Ontario to State of Washington found on momondo in the last 72 hours is $242.

The fastest flight from Ontario to State of Washington takes 2h 15m

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), Seattle/Tacoma Intl (SEA).

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Frequently asked questions about flying from Ontario to Washington

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 April 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) (22.85% of total bookings). The next most popular plane models are Airbus A321neo (12.41%), Boeing 737-700 (11.07%), and Boeing 737-900 Passenger/BBJ3 (winglets) (8.74%).

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 $87	Free Cancellation	Rating 5.6 2,970 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $88	Free Cancellation	Rating 7.8 2,837 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $99	Free Cancellation	Rating 7.9 8,465 reviews	Search Delta flights
Alaska Airlines	PriceFrom $139	Free Cancellation	Rating 7.9 12,313 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $146	Free Cancellation	Rating 8.0 4,314 reviews	Search Southwest flights
United Airlines	PriceFrom $258	Free Cancellation	Rating 7.4 9,680 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 $75

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 5/20. 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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Frontier flights from Ontario to State of Washington

Our best Frontier 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 from Ontario to Washington?

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

Frequently asked questions about flying from Ontario to 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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