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

229 flights are operational weekly from Ontario to State of Washington as of August 2025. The most popular departure day for this route is Mon, with 16% of flights per week taking off on this day.

What airlines fly to State of Washington?

Alaska Airlines, Delta and Frontier 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.

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

Frontier, Southwest, 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 day?

The number of flights available between Ontario and State of Washington is 32 per day as of August 2025. The most frequent departure time is 6:00AM, with 53% 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 August 2025, there are 7 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.

$63 Cheap Flights from Ontario to Washington in 2025

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Find the cheapest flights from Ontario to Washington

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

4:56 pm - 7:42 pmONT-SEA

2h 46mnonstop

8:42 pm - 11:24 pmSEA-ONT

2h 42mnonstop

$110Frontier

Find Deal

Sat, Aug 23 - Tue, Aug 26

5:03 pm - 7:53 pmONT-SEA

2h 50mnonstop

8:42 pm - 11:24 pmSEA-ONT

2h 42mnonstop

$124Frontier

Find Deal

Tue, Aug 19 - Wed, Aug 27

11:15 am - 1:34 pmONT-PDX

2h 19mnonstop

7:40 am - 10:01 amPDX-ONT

2h 21mnonstop

$157Alaska Airlines

Find Deal

Sat, Oct 11 - Tue, Oct 14

3:06 pm - 5:46 pmONT-SEA

2h 40mnonstop

11:25 am - 2:12 pmSEA-ONT

2h 47mnonstop

$157Alaska Airlines

Find Deal

Sat, Sep 13 - Tue, Sep 16

11:48 am - 7:18 pmONT-PDX

7h 30m1 stop

7:05 pm - 11:39 pmPDX-ONT

4h 34m1 stop

$177Delta

Find Deal

Sat, Oct 11 - Tue, Oct 14

6:05 pm - 8:50 pmONT-SEA

2h 45mnonstop

7:50 pm - 10:42 pmSEA-ONT

2h 52mnonstop

$177Delta

Find Deal

Wed, Sep 3 - Tue, Sep 9

6:35 pm - 11:10 pmONT-GEG

4h 35m1 stop

5:45 am - 12:40 pmGEG-ONT

6h 55m2 stops

$264Southwest

Find Deal

Thu, Aug 28 - Thu, Sep 4

3:06 pm - 9:15 pmONT-PSC

6h 09m1 stop

1:07 pm - 6:33 pmPSC-ONT

5h 26m1 stop

$266Hawaiian Airlines

Find Deal

Thu, Oct 2 - Mon, Oct 6

6:00 am - 12:22 pmONT-BLI

6h 22m1 stop

1:02 pm - 6:33 pmBLI-ONT

5h 31m1 stop

$278Hawaiian Airlines

Find Deal

Wed, Oct 15 - Thu, Oct 23

5:05 pm - 11:40 pmONT-GEG

6h 35m1 stop

10:10 am - 2:30 pmGEG-ONT

4h 20m1 stop

$279Southwest

Find Deal

Fri, Aug 29 - Fri, Sep 5

Delta flights from Ontario to State of Washington

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

Delta

Sep 3

ONT6:05 pmOntario

2h 45m

SEA8:50 pmSeattle/Tacoma Intl

Sep 9

SEA7:50 pmSeattle/Tacoma Intl

2h 52m

ONT10:42 pmOntario

$177

Find similar

Delta

Sep 13

ONT11:50 amOntario

2h 55m

SEA2:45 pmSeattle/Tacoma Intl

Sep 14

SEA8:15 amSeattle/Tacoma Intl

2h 54m

ONT11:09 amOntario

$189

Find similar

Delta

Oct 31

ONT3:45 pmOntario

7h 10m

1 stop

PSC10:55 pmPasco Tri Cities

Nov 3

PSC5:13 pmPasco Tri Cities

4h 07m

1 stop

ONT9:20 pmOntario

$219

Find similar

Frontier flights from Ontario to State of Washington

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

Frontier

Aug 23

ONT4:56 pmOntario

2h 46m

SEA7:42 pmSeattle/Tacoma Intl

Aug 26

SEA8:42 pmSeattle/Tacoma Intl

2h 42m

ONT11:24 pmOntario

$110

Find similar

Frontier

Aug 19

ONT5:03 pmOntario

2h 50m

SEA7:53 pmSeattle/Tacoma Intl

Aug 27

SEA8:42 pmSeattle/Tacoma Intl

2h 42m

ONT11:24 pmOntario

$124

Find similar

Frontier

Oct 20

ONT8:25 amOntario

2h 26m

PDX10:51 amPortland

Oct 24

PDX6:43 pmPortland

2h 22m

ONT9:05 pmOntario

$126

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 8/23

4:56 pm-7:42 pm

Nonstop2h 46m

Seattle/Tacoma Intl

Tue 8/26

8:42 pm-11:24 pm

Nonstop2h 42m

$110

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 8/19

5:03 pm-7:53 pm

Nonstop2h 50m

Seattle/Tacoma Intl

Wed 8/27

8:42 pm-11:24 pm

Nonstop2h 42m

$124

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 10/11

11:15 am-1:34 pm

Nonstop2h 19m

Portland

Tue 10/14

7:40 am-10:01 am

Nonstop2h 21m

$157

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 9/13

3:06 pm-5:46 pm

Nonstop2h 40m

Seattle/Tacoma Intl

Tue 9/16

11:25 am-2:12 pm

Nonstop2h 47m

$157

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 10/11

11:48 am-7:18 pm

1 stop7h 30m

Portland

Tue 10/14

7:05 pm-11:39 pm

1 stop4h 34m

$177

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 9/3

6:05 pm-8:50 pm

Nonstop2h 45m

Seattle/Tacoma Intl

Tue 9/9

7:50 pm-10:42 pm

Nonstop2h 52m

$177

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Thu 8/28

6:35 pm-11:10 pm

1 stop4h 35m

Spokane

Thu 9/4

5:45 am-12:40 pm

2 stops6h 55m

$264

OntarioPasco

ONT - PSC

ONTPSC

Ontario

Thu 10/2

3:06 pm-9:15 pm

1 stop6h 09m

Pasco Tri Cities

Mon 10/6

1:07 pm-6:33 pm

1 stop5h 26m

$266

OntarioBellingham

ONT - BLI

ONTBLI

Ontario

Wed 10/15

6:00 am-12:22 pm

1 stop6h 22m

Bellingham

Thu 10/23

1:02 pm-6:33 pm

1 stop5h 31m

$278

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Fri 8/29

5:05 pm-11:40 pm

1 stop6h 35m

Spokane

Fri 9/5

10:10 am-2:30 pm

1 stop4h 20m

$279

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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 $157. If you aren’t able to travel to State of Washington during the month of January, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $161.

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 Friday. Travelers who choose to depart for State of Washington on a Friday will often find tickets for as low as $237. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to State of Washington for around $298.

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 $243. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $313 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 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 $199 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 $165 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.

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	$63
Fastest flight time	2h 18m
Direct flights	Every day
Airports in State of Washington	2 airports

The best one-way flight to State of Washington from Ontario in the past 72 hours is $63. The best round-trip flight deal from Ontario to State of Washington found on momondo in the last 72 hours is $110.

The fastest flight from Ontario to State of Washington takes 2h 18m

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

There are 2 airports near State of Washington: Portland (PDX), Seattle/Tacoma Intl (SEA)

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 August 2025, there are 7 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) (19.93% of total bookings). The next most popular plane models are Boeing 737-900 Passenger/BBJ3 (winglets) (15.62%), Boeing 737 MAX 9 (14.67%), and Airbus A320neo (13.87%).

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
Spirit Airlines	PriceFrom $71	Free Cancellation	Rating 6.3 8,053 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $72	Free Cancellation	Rating 5.8 3,231 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $98	Free Cancellation	Rating 7.8 2,617 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $116	Free Cancellation	Rating 8.0 7,986 reviews	Search Delta flights
Alaska Airlines	PriceFrom $137	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $150	Free Cancellation	Rating 8.0 4,246 reviews	Search Southwest flights
United Airlines	PriceFrom $218	Free Cancellation	Rating 7.4 8,909 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

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.

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Popular cities in Washington

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Cheap flights from Ontario to Washington from $63

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 9/22. 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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Filter for what you want

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Delta flights from Ontario to State of Washington

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

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

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

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?

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?

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.

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

Frontier, Southwest, and Delta are the most popular carriers operating 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?

The number of flights available between Ontario and State of Washington is 32 per day as of August 2025. The most frequent departure time is 6:00AM, with 53% of daily flights leaving at noon.

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

229 flights are operational weekly from Ontario to State of Washington as of August 2025. The most popular departure day for this route is Mon, with 16% of flights per week taking off on this day.

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

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

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

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

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

What is the most popular plane model from Ontario to 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?

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

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

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

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

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

Popular cities in Washington

Popular flights according to clicks in the last 7 days on momondo