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 45% 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?

Alaska 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 day?

The number of flights available between Ontario and State of Washington is 20 per day as of December 2025. The most frequent departure time is 6:00AM, with 75% of daily flights leaving at noon.

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

144 flights are operational weekly from Ontario to State of Washington as of December 2025. The most popular departure day for this route is Tue, with 19% 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 December 2025, 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.

$68 Cheap Flights from Ontario to Washington in 2025/26

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Find the cheapest flights from Ontario to Washington

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:10 pm - 12:09 am

ONT

SEA

6h 59m1 stop

4:55 pm - 11:58 pm

SEA

ONT

7h 03m1 stop

$119Delta

mié., ene. 21 - mié., ene. 28

5:15 pm - 8:08 pm

ONT

SEA

2h 53mnonstop

2:49 pm - 11:14 pm

SEA

ONT

8h 25m1 stop

$123Frontier

jue., ene. 8 - sáb., ene. 10

6:14 am - 9:09 am

ONT

SEA

2h 55mnonstop

8:56 pm - 11:32 pm

SEA

ONT

2h 36mnonstop

$129Alaska Airlines

jue., feb. 19 - lun., feb. 23

5:15 pm - 8:08 pm

ONT

SEA

2h 53mnonstop

9:02 pm - 5:54 pm

SEA

ONT

20h 52m1 stop

$131Frontier

jue., ene. 8 - lun., ene. 12

6:14 am - 9:09 am

ONT

SEA

2h 55mnonstop

7:00 am - 9:39 am

SEA

ONT

2h 39mnonstop

$138Alaska Airlines

mar., mar. 17 - mié., mar. 25

7:30 am - 10:36 am

ONT

SEA

3h 06mnonstop

8:07 pm - 10:51 pm

SEA

ONT

2h 44mnonstop

$139Delta

mar., ene. 13 - mié., ene. 14

5:45 pm - 10:35 pm

ONT

PDX

4h 50m1 stop

6:10 am - 9:50 am

PDX

ONT

3h 40m1 stop

$169Southwest

mar., feb. 10 - vie., feb. 13

1:46 pm - 4:20 pm

ONT

PDX

2h 34mnonstop

2:43 pm - 5:03 pm

PDX

ONT

2h 20mnonstop

$170Hawaiian Airlines

jue., ene. 15 - dom., ene. 18

8:30 am - 1:40 pm

ONT

PDX

5h 10m1 stop

7:25 am - 1:50 pm

PDX

ONT

6h 25m2 stops

$174Southwest

mar., feb. 3 - dom., feb. 8

6:14 am - 1:35 pm

ONT

PUW

7h 21m1 stop

5:00 am - 11:08 am

PUW

ONT

6h 08m1 stop

$404Hawaiian Airlines

dom., mar. 8 - mié., mar. 11

Delta flights from Ontario to State of Washington

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

Delta

Jan 21

ONT5:10 pmOntario

6h 59m

1 stop

SEA12:09 amSeattle/Tacoma Intl

Jan 27

SEA7:00 pmSeattle/Tacoma Intl

4h 58m

1 stop

ONT11:58 pmOntario

$119

Find similar

Delta

Jan 13

ONT7:30 amOntario

3h 06m

SEA10:36 amSeattle/Tacoma Intl

Jan 13

SEA8:07 pmSeattle/Tacoma Intl

2h 44m

ONT10:51 pmOntario

$139

Find similar

Delta

Jan 16

ONT3:30 pmOntario

3h 05m

SEA6:35 pmSeattle/Tacoma Intl

Jan 17

SEA8:07 pmSeattle/Tacoma Intl

2h 44m

ONT10:51 pmOntario

$149

Find similar

Frontier flights from Ontario to State of Washington

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

Frontier

Jan 8

ONT5:15 pmOntario

2h 53m

SEA8:08 pmSeattle/Tacoma Intl

Jan 10

SEA2:49 pmSeattle/Tacoma Intl

8h 25m

1 stop

ONT11:14 pmOntario

$123

Find similar

Frontier

Jan 8

ONT5:15 pmOntario

2h 53m

SEA8:08 pmSeattle/Tacoma Intl

Jan 12

SEA9:02 pmSeattle/Tacoma Intl

20h 52m

1 stop

ONT5:54 pmOntario

$131

Find similar

Frontier

Jan 7

ONT10:45 amOntario

22h 19m

1 stop

SEA9:04 amSeattle/Tacoma Intl

Jan 11

SEA9:23 pmSeattle/Tacoma Intl

10h 13m

1 stop

ONT7:36 amOntario

$132

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

mié. 1/21

5:10 pm-12:09 am

1 stop6h 59m

Seattle/Tacoma Intl

mié. 1/28

4:55 pm-11:58 pm

1 stop7h 03m

$119

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

jue. 1/8

5:15 pm-8:08 pm

Nonstop2h 53m

Seattle/Tacoma Intl

sáb. 1/10

2:49 pm-11:14 pm

1 stop8h 25m

$123

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

jue. 2/19

6:14 am-9:09 am

Nonstop2h 55m

Seattle/Tacoma Intl

lun. 2/23

8:56 pm-11:32 pm

Nonstop2h 36m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

jue. 1/8

5:15 pm-8:08 pm

Nonstop2h 53m

Seattle/Tacoma Intl

lun. 1/12

9:02 pm-5:54 pm

1 stop20h 52m

$131

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

mar. 3/17

6:14 am-9:09 am

Nonstop2h 55m

Seattle/Tacoma Intl

mié. 3/25

7:00 am-9:39 am

Nonstop2h 39m

$138

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

mar. 1/13

7:30 am-10:36 am

Nonstop3h 06m

Seattle/Tacoma Intl

mié. 1/14

8:07 pm-10:51 pm

Nonstop2h 44m

$139

OntarioPortland

ONT - PDX

ONTPDX

Ontario

mar. 2/10

5:45 pm-10:35 pm

1 stop4h 50m

Portland

vie. 2/13

6:10 am-9:50 am

1 stop3h 40m

$169

OntarioPortland

ONT - PDX

ONTPDX

Ontario

jue. 1/15

1:46 pm-4:20 pm

Nonstop2h 34m

Portland

dom. 1/18

2:43 pm-5:03 pm

Nonstop2h 20m

$170

OntarioPortland

ONT - PDX

ONTPDX

Ontario

mar. 2/3

8:30 am-1:40 pm

1 stop5h 10m

Portland

dom. 2/8

7:25 am-1:50 pm

2 stops6h 25m

$174

OntarioPullman

ONT - PUW

ONTPUW

Ontario

dom. 3/8

6:14 am-1:35 pm

1 stop7h 21m

Pullman Moscow Regional

mié. 3/11

5:00 am-11:08 am

1 stop6h 08m

$404

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 $159. If you aren’t able to travel to State of Washington during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $182.

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 $299.

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 $254. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $292 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 $212 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 $174 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?

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	$145
Fastest flight time	2h 24m
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 $145. The best round-trip flight deal from Ontario to State of Washington found on momondo in the last 72 hours is $195.

The fastest flight from Ontario to State of Washington takes 2h 24m

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 December 2025, 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) (20.39% of total bookings). The next most popular plane models are Airbus A320neo (11.74%), Boeing 737-900 Passenger/BBJ3 (winglets) (9.72%), and Boeing 737-700 (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 $84	Free Cancellation	Rating 5.8 3,073 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $98	Free Cancellation	Rating 7.8 2,820 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $118	Free Cancellation	Rating 7.9 8,015 reviews	Search Delta flights
Alaska Airlines	PriceFrom $148	Free Cancellation	Rating 8.0 11,517 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $150	Free Cancellation	Rating 8.0 4,256 reviews	Search Southwest flights
United Airlines	PriceFrom $272	Free Cancellation	Rating 7.4 9,109 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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Flights to Atlantafrom $47

Flights to Dallasfrom $51

Flights to Seattlefrom $55

Cheap flights from Ontario to Washington from $68

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 1/21. 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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Find the cheapest flights from Ontario to Washington

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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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Use the filters below to find and compare flights from Ontario to Washington that are best for you.

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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?

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.

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.

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

Alaska Airlines 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 20 per day as of December 2025. The most frequent departure time is 6:00AM, with 75% of daily flights leaving at noon.

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

144 flights are operational weekly from Ontario to State of Washington as of December 2025. The most popular departure day for this route is Tue, with 19% 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