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 20 per day as of June 2026. The most frequent departure time is 6:00AM, with 44% of daily flights leaving at noon.

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

Southwest, Delta, and United 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 51% of people opting to fly with this airline when traveling to State of Washington. Keep in mind that there are 10 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 week?

143 flights are operational weekly from Ontario to State of Washington as of June 2026. The most popular departure day for this route is Sun, with 22% of flights per week taking off on this day.

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 June 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.

$88 Cheap Flights from Ontario to Washington in 2026

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Find the cheapest flights from Ontario to Washington

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Enter your travel dates to find the best prices.

4:04 pm - 6:58 pm

ONT

SEA

2h 54mnonstop

11:53 am - 2:39 pm

SEA

ONT

2h 46mnonstop

$176Frontier

Wed, Aug 19 - Sat, Aug 22

4:04 pm - 6:58 pm

ONT

SEA

2h 54mnonstop

11:53 am - 2:39 pm

SEA

ONT

2h 46mnonstop

$177Frontier

Sat, Aug 22 - Sat, Aug 29

2:58 pm - 1:41 pm

ONT

BLI

22h 43m

1 stop

2:01 pm - 4:10 pm

BLI

ONT

26h 09m

1 stop

$227Multiple Airlines

Wed, Sep 16 - Mon, Sep 21

11:56 am - 7:44 pm

ONT

PDX

7h 48m

1 stop

7:00 pm - 11:34 pm

PDX

ONT

4h 34m

1 stop

$233Delta

Sun, Aug 9 - Thu, Aug 13

5:26 pm - 11:59 pm

ONT

GEG

6h 33m

1 stop

8:53 am - 3:38 pm

GEG

ONT

6h 45m

1 stop

$237Alaska Airlines

Tue, Aug 11 - Wed, Aug 12

2:40 pm - 7:50 pm

ONT

PDX

5h 10m

1 stop

2:05 pm - 8:50 pm

PDX

ONT

6h 45m

1 stop

$237Southwest

Tue, Sep 8 - Sat, Sep 12

7:45 am - 4:15 pm

ONT

GEG

8h 30m

2 stops

5:45 am - 10:15 am

GEG

ONT

4h 30m

1 stop

$242Southwest

Tue, Aug 11 - Tue, Aug 18

4:34 pm - 8:11 pm

ONT

PSC

27h 37m

1 stop

9:01 pm - 7:48 pm

PSC

ONT

22h 47m

1 stop

$250Multiple Airlines

Thu, Aug 13 - Mon, Aug 17

3:35 pm - 9:35 pm

ONT

GEG

6h 00m

1 stop

11:09 am - 5:21 pm

GEG

ONT

6h 12m

1 stop

$260Delta

Sat, Aug 8 - Wed, Aug 12

10:54 am - 3:22 pm

ONT

PSC

4h 28m

1 stop

6:04 pm - 11:11 pm

PSC

ONT

5h 07m

1 stop

$309Alaska Airlines

Sat, Jul 4 - Sat, Jul 11

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Frontier flights from Ontario to State of Washington

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

Frontier

Sep 2

ONT4:04 pmOntario

2h 54m

SEA6:58 pmSeattle/Tacoma Intl

Sep 8

SEA11:53 amSeattle/Tacoma Intl

2h 46m

ONT2:39 pmOntario

$176

Frontier

Aug 22

ONT4:04 pmOntario

2h 54m

SEA6:58 pmSeattle/Tacoma Intl

Aug 29

SEA11:53 amSeattle/Tacoma Intl

2h 46m

ONT2:39 pmOntario

$177

Frontier

Sep 9

ONT5:05 pmOntario

2h 56m

SEA8:01 pmSeattle/Tacoma Intl

Sep 16

SEA11:15 amSeattle/Tacoma Intl

2h 48m

ONT2:03 pmOntario

$178

Alaska Airlines flights from Ontario to State of Washington

Our best Alaska Airlines deals on Ontario to State of Washington flight tickets

Alaska Airlines

Aug 19

ONT6:02 amOntario

2h 43m

SEA8:45 amSeattle/Tacoma Intl

Aug 25

SEA8:18 amSeattle/Tacoma Intl

2h 46m

ONT11:04 amOntario

$237

Alaska Airlines

Jun 28

ONT7:00 amOntario

2h 15m

PDX9:15 amPortland

Jul 5

PDX7:36 amPortland

2h 20m

ONT9:56 amOntario

$297

Alaska Airlines

Aug 7

ONT9:20 pmOntario

11h 06m

1 stop

GEG8:26 amSpokane

Aug 10

GEG5:00 amSpokane

4h 56m

1 stop

ONT9:56 amOntario

$306

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 8/19

4:04 pm-6:58 pm

Nonstop2h 54m

Seattle/Tacoma Intl

Sat 8/22

11:53 am-2:39 pm

Nonstop2h 46m

$176

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 8/22

4:04 pm-6:58 pm

Nonstop2h 54m

Seattle/Tacoma Intl

Sat 8/29

11:53 am-2:39 pm

Nonstop2h 46m

$177

OntarioBellingham

ONT - BLI

ONTBLI

Ontario

Wed 9/16

2:58 pm-1:41 pm

1 stop22h 43m

Bellingham

Mon 9/21

2:01 pm-4:10 pm

1 stop26h 09m

$227

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sun 8/9

11:56 am-7:44 pm

1 stop7h 48m

Portland

Thu 8/13

7:00 pm-11:34 pm

1 stop4h 34m

$233

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Tue 8/11

5:26 pm-11:59 pm

1 stop6h 33m

Spokane

Wed 8/12

8:53 am-3:38 pm

1 stop6h 45m

$237

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 9/8

2:40 pm-7:50 pm

1 stop5h 10m

Portland

Sat 9/12

2:05 pm-8:50 pm

1 stop6h 45m

$237

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Tue 8/11

7:45 am-4:15 pm

2 stops8h 30m

Spokane

Tue 8/18

5:45 am-10:15 am

1 stop4h 30m

$242

OntarioPasco

ONT - PSC

ONTPSC

Ontario

Thu 8/13

4:34 pm-8:11 pm

1 stop27h 37m

Pasco Tri Cities

Mon 8/17

9:01 pm-7:48 pm

1 stop22h 47m

$250

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Sat 8/8

3:35 pm-9:35 pm

1 stop6h 00m

Spokane

Wed 8/12

11:09 am-5:21 pm

1 stop6h 12m

$260

OntarioPasco

ONT - PSC

ONTPSC

Ontario

Sat 7/4

10:54 am-3:22 pm

1 stop4h 28m

Pasco Tri Cities

Sat 7/11

6:04 pm-11:11 pm

1 stop5h 07m

$309

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 $258. 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 $320.

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 $312 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 $244 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 $197 on momondo.

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

There are 4 cabin classes available to choose from on Ontario to State of 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 20% 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	$184
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 $184. The best round-trip flight deal from Ontario to State of Washington found on momondo in the last 72 hours is $267.

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).

Search flight deals

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 June 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 Airbus A321neo (23.21% of total bookings). The next most popular plane models are Boeing 737-800 Passenger/BBJ2 (winglets) (17.95%), Boeing 737-700 (9.68%), and Boeing 737-900 Passenger/BBJ3 (winglets) (7.97%).

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 $88	Free Cancellation	Rating 5.6 2,889 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $98	Free Cancellation	Rating 7.8 2,829 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $104	Free Cancellation	Rating 7.9 8,403 reviews	Search Delta flights
Alaska Airlines	PriceFrom $139	Free Cancellation	Rating 7.9 12,507 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $150	Free Cancellation	Rating 7.9 4,234 reviews	Search Southwest flights
United Airlines	PriceFrom $272	Free Cancellation	Rating 7.4 9,820 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.

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Cheap flights from Ontario to Washington from $88

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 8/4. 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

Alaska Airlines flights from Ontario to State of Washington

Our best Alaska Airlines 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?

What cabin class options are available on Ontario to State of 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

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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