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 52% of people opting to fly with this airline when traveling to State of Washington. Keep in mind that there are 9 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?

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

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

Frontier, Delta, and Alaska Airlines 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 20 per day as of August 2026. The most frequent departure time is 6:00AM, with 56% 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 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.

$59 Cheap Flights from Ontario to Washington in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Washington

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

5:34 pm - 8:30 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 56mnonstop

10:53 am - 1:45 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 52mnonstop

$167Frontier

Sat, Sep 19 - Mon, Sep 21

4:44 pm - 7:33 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 49mnonstop

10:53 am - 1:45 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 52mnonstop

$168Frontier

Sat, Sep 5 - Wed, Sep 9

5:44 pm - 8:40 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 56mnonstop

10:58 am - 5:05 pmSEA Seattle/Tacoma Intl-ONT Ontario

6h 07m1 stop Santa Rosa Sonoma County

$183Multiple Airlines

Mon, Oct 5 - Wed, Oct 7

10:47 am - 3:59 pmONT Ontario-SEA Seattle/Tacoma Intl

5h 12m1 stop Portland

10:53 am - 1:45 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 52mnonstop

$185Multiple Airlines

Sat, Sep 19 - Mon, Sep 21

12:00 pm - 4:00 pmONT Ontario-SEA Seattle/Tacoma Intl

4h 00m1 stop Sacramento Intl

5:00 am - 9:25 amSEA Seattle/Tacoma Intl-ONT Ontario

4h 25m1 stop Las Vegas Harry Reid Intl

$242Southwest

Tue, Jan 19 - Tue, Feb 2

12:00 pm - 4:00 pmONT Ontario-SEA Seattle/Tacoma Intl

4h 00m1 stop Sacramento Intl

7:40 am - 11:55 amSEA Seattle/Tacoma Intl-ONT Ontario

4h 15m1 stop Las Vegas Harry Reid Intl

$242Southwest

Wed, Feb 3 - Sat, Feb 6

6:02 am - 8:45 amONT Ontario-SEA Seattle/Tacoma Intl

2h 43mnonstop

10:31 am - 1:16 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 45mnonstop

$247Alaska Airlines

Tue, Sep 22 - Tue, Oct 6

2:13 pm - 4:56 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 43mnonstop

7:30 am - 10:17 amSEA Seattle/Tacoma Intl-ONT Ontario

2h 47mnonstop

$247Alaska Airlines

Tue, Oct 6 - Sat, Oct 10

5:53 pm - 8:50 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 57mnonstop

8:11 pm - 11:00 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 49mnonstop

$247Delta

Tue, Dec 1 - Sat, Dec 5

11:54 am - 2:50 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 56mnonstop

2:29 pm - 5:19 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 50mnonstop

$247Delta

Tue, Sep 15 - Tue, Sep 22

Cheap last minute flights

Enter your travel dates to find the best prices.

4:49 pm - 7:38 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 49mnonstop

11:54 am - 2:45 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 51mnonstop

$224Frontier

Mon, Aug 17 - Thu, Aug 27

4:49 pm - 7:38 pmONT Ontario-SEA Seattle/Tacoma Intl

2h 49mnonstop

11:54 am - 2:45 pmSEA Seattle/Tacoma Intl-ONT Ontario

2h 51mnonstop

$224Frontier

Wed, Aug 19 - Thu, Aug 27

5:05 pm - 11:39 pmONT Ontario-PDX Portland

6h 34m1 stop Salt Lake City

5:30 am - 11:16 amPDX Portland-ONT Ontario

5h 46m1 stop Seattle/Tacoma Intl

$307Delta

Tue, Aug 18 - Mon, Aug 24

6:01 pm - 11:56 pmONT Ontario-PDX Portland

5h 55m1 stop Seattle/Tacoma Intl

3:25 pm - 10:45 pmPDX Portland-ONT Ontario

7h 20m1 stop Seattle/Tacoma Intl

$307Delta

Wed, Aug 19 - Mon, Aug 24

9:01 am - 2:47 pmONT Ontario-PDX Portland

5h 46m1 stop San Francisco

7:00 am - 12:12 pmPDX Portland-ONT Ontario

5h 12m1 stop San Francisco

$339United Airlines

Wed, Aug 19 - Wed, Sep 16

9:05 am - 2:05 pmONT Ontario-PDX Portland

5h 00m1 stop San Jose

5:50 am - 1:35 pmPDX Portland-ONT Ontario

7h 45m2 stops Las Vegas Harry Reid Intl San Jose

$342Southwest

Wed, Aug 19 - Wed, Aug 26

6:00 am - 5:11 pmONT Ontario-PDX Portland

11h 11m1 stop Denver Intl

5:53 pm - 8:24 pmPDX Portland-ONT Ontario

2h 31mnonstop

$377Multiple Airlines

Wed, Aug 19 - Wed, Sep 2

6:00 am - 4:51 pmONT Ontario-PDX Portland

10h 51m1 stop Denver Intl

7:18 am - 9:51 amPDX Portland-ONT Ontario

2h 33mnonstop

$384Multiple Airlines

Mon, Aug 17 - Fri, Sep 4

7:15 am - 1:40 pmONT Ontario-PDX Portland

6h 25m1 stop Sacramento Intl

6:45 am - 10:40 amPDX Portland-ONT Ontario

3h 55m1 stop Sacramento Intl

$393Southwest

Sun, Aug 16 - Sun, Aug 23

6:08 am - 10:11 amONT Ontario-PDX Portland

4h 03m1 stop San Francisco

5:30 am - 12:12 pmPDX Portland-ONT Ontario

6h 42m1 stop San Francisco

$443United Airlines

Sun, Aug 16 - Sun, Aug 30

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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 19

ONT5:34 pmOntario

2h 56m

SEA8:30 pmSeattle/Tacoma Intl

Sep 21

SEA10:53 amSeattle/Tacoma Intl

2h 52m

ONT1:45 pmOntario

$167

Frontier

Sep 5

ONT4:44 pmOntario

2h 49m

SEA7:33 pmSeattle/Tacoma Intl

Sep 9

SEA10:53 amSeattle/Tacoma Intl

2h 52m

ONT1:45 pmOntario

$168

Frontier

Sep 9

ONT5:44 pmOntario

2h 56m

SEA8:40 pmSeattle/Tacoma Intl

Sep 13

SEA10:53 amSeattle/Tacoma Intl

2h 52m

ONT1:45 pmOntario

$170

Delta flights from Ontario to State of Washington

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

Delta

Sep 2

ONT6:20 amOntario

5h 25m

1 stop

PDX11:45 amPortland

Sep 12

PDX5:50 pmPortland

4h 50m

1 stop

ONT10:40 pmOntario

$249

Delta

Sep 7

ONT6:00 amOntario

6h 10m

1 stop

PDX12:10 pmPortland

Sep 14

PDX5:10 pmPortland

6h 37m

1 stop

ONT11:47 pmOntario

$250

Delta

Aug 28

ONT6:01 pmOntario

5h 55m

1 stop

PDX11:56 pmPortland

Sep 4

PDX12:25 pmPortland

4h 56m

1 stop

ONT5:21 pmOntario

$251

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Sat 9/19

5:34 pm-8:30 pm

Nonstop2h 56m

Seattle/Tacoma Intl

Mon 9/21

10:53 am-1:45 pm

Nonstop2h 52m

$167

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Sat 9/5

4:44 pm-7:33 pm

Nonstop2h 49m

Seattle/Tacoma Intl

Wed 9/9

10:53 am-1:45 pm

Nonstop2h 52m

$168

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Mon 10/5

5:44 pm-8:40 pm

Nonstop2h 56m

Seattle/Tacoma Intl

Wed 10/7

10:58 am-5:05 pm

1 stop6h 07m

$183

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Sat 9/19

10:47 am-3:59 pm

1 stop5h 12m

Seattle/Tacoma Intl

Mon 9/21

10:53 am-1:45 pm

Nonstop2h 52m

$185

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Tue 1/19

12:00 pm-4:00 pm

1 stop4h 00m

Seattle/Tacoma Intl

Tue 2/2

5:00 am-9:25 am

1 stop4h 25m

$242

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Wed 2/3

12:00 pm-4:00 pm

1 stop4h 00m

Seattle/Tacoma Intl

Sat 2/6

7:40 am-11:55 am

1 stop4h 15m

$242

Quickest round-trip

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Tue 9/22

6:02 am-8:45 am

Nonstop2h 43m

Seattle/Tacoma Intl

Tue 10/6

10:31 am-1:16 pm

Nonstop2h 45m

$247

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Tue 10/6

2:13 pm-4:56 pm

Nonstop2h 43m

Seattle/Tacoma Intl

Sat 10/10

7:30 am-10:17 am

Nonstop2h 47m

$247

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Tue 12/1

5:53 pm-8:50 pm

Nonstop2h 57m

Seattle/Tacoma Intl

Sat 12/5

8:11 pm-11:00 pm

Nonstop2h 49m

$247

OntarioSeattle

ONT Ontario - SEA Seattle/Tacoma Intl

ONTSEA

Ontario

Tue 9/15

11:54 am-2:50 pm

Nonstop2h 56m

Seattle/Tacoma Intl

Tue 9/22

2:29 pm-5:19 pm

Nonstop2h 50m

$247

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 $212. If you aren’t able to travel to State of Washington during the month of January, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $230.

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 $295. 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 $351.

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 $270. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $347 on average. Flights to State of Washington from Ontario in the morning 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 $256 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 $205 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?

No. A direct flight is the cheapest option for a flight between Ontario to State of Washington.

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	$178
Fastest flight time	1h 51m
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 $178. The best round-trip flight deal from Ontario to State of Washington found on momondo in the last 72 hours is $241.

The fastest flight from Ontario to State of Washington takes 1h 51m

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 August 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 (22.47% of total bookings). The next most popular plane models are Boeing 737-800 Passenger/BBJ2 (winglets) (18.86%), Boeing 737-900 Passenger/BBJ3 (winglets) (9.21%), and Boeing 737 MAX 8 (8.70%).

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 $85	Free Cancellation	Rating 5.6 2,694 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $98	Free Cancellation	Rating 7.8 2,817 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $100	Free Cancellation	Rating 7.8 8,503 reviews	Search Delta flights
Alaska Airlines	PriceFrom $139	Free Cancellation	Rating 7.9 12,808 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $150	Free Cancellation	Rating 8.0 4,218 reviews	Search Southwest flights
United Airlines	PriceFrom $176	Free Cancellation	Rating 7.4 10,110 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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Popular cities in Washington

Flights to New Yorkfrom $73

Flights to Los Angelesfrom $50

Flights to Orlandofrom $40

Flights to Miamifrom $70

Flights to San Franciscofrom $56

Flights to Chicagofrom $56

Flights to Las Vegasfrom $50

Flights to Washington, D.C.from $52

Flights to Bostonfrom $88

Flights to Atlantafrom $42

Flights to Fort Lauderdalefrom $42

Flights to Dallasfrom $50

Cheap flights from Ontario to Washington from $70

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 9/11. 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

Delta flights from Ontario to State of Washington

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

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See travel insights to Washington from

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

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

Popular cities in Washington

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

Ontario flight routes

According to popular flight searches on momondo this year

State of Washington flight routes

According to popular flight searches on momondo this year

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