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$49+ Cheap flights from Ontario (ONT) to Washington

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
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Cheap flight deals from Ontario to Washington

Keep the following information in mind while searching for Ontario to Washington flight deals. Data was last updated March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$98
(Cheapflightsfares)

One-way from

$49
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$237

Good round-trip deal

$160 or less

Good one-way deal

$119 or less
Provider with most accurate pricing for Los Angeles-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Seattle/Tacoma Intl flights.
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From Ontario to Washington
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One-way flight from Ontario to Washington
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Highest demand for flights based on searches. 11% potential increase in price ($28 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Ontario to Washington.
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Price to beat on a one-way flight from Ontario to Washington.
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Find flight deals from Ontario to Washington

Cheapest flights from Ontario to Washington
Explore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1810:12 amONT - SEA
Nonstop2h 54mFrontier
Mon 4/2112:46 pmSEA - ONT
Nonstop2h 39mFrontier
Deal found 3/28$98
This Travelocity deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/14:29 pmONT - SEA
Nonstop3h 03mMultiple Airlines
Tue 5/65:55 pmSEA - ONT
Nonstop2h 34mMultiple Airlines
Deal found 3/26$149
This United Airlines deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/71:45 pmONT - SEA
1 stop7h 46mUnited Airlines
Sat 5/175:05 amSEA - ONT
1 stop7h 19mUnited Airlines
Deal found 3/27$162
This Trip.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/306:00 amONT - SEA
Nonstop2h 46mHawaiian Airlines
Tue 5/138:13 amSEA - ONT
Nonstop2h 38mHawaiian Airlines
Deal found 3/27$173
This Cheapflightsfares deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/232:19 pmONT - PDX
Nonstop2h 31mFrontier
Mon 5/2611:04 amPDX - ONT
Nonstop2h 20mFrontier
Deal found 3/26$176
This Alaska Airlines deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/228:59 pmONT - PDX
Nonstop2h 21mAlaska Airlines
Tue 4/299:42 pmPDX - ONT
Nonstop2h 16mAlaska Airlines
Deal found 3/28$177
This Delta deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/611:45 amONT - SEA
Nonstop2h 55mDelta
Tue 5/2011:30 amSEA - ONT
Nonstop2h 45mDelta
Deal found 3/27$177
This Kiwi.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/307:00 amONT - PDX
Nonstop2h 26mHawaiian Airlines
Wed 5/79:42 pmPDX - ONT
Nonstop2h 16mHawaiian Airlines
Deal found 3/27$179
This Travelocity deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/292:19 pmONT - PDX
Nonstop2h 31mMultiple Airlines
Tue 6/37:00 amPDX - ONT
Nonstop2h 17mMultiple Airlines
Deal found 3/27$183
This Alaska Airlines deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/36:00 amONT - SEA
Nonstop2h 46mAlaska Airlines
Wed 5/78:13 amSEA - ONT
Nonstop2h 38mAlaska Airlines
Deal found 3/27$187
This Southwest deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/294:35 pmONT - PDX
1 stop6h 15mSouthwest
Tue 6/36:45 amPDX - ONT
1 stop3h 25mSouthwest
Deal found 3/27$192
This Delta deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/222:35 pmONT - PDX
1 stop4h 35mDelta
Wed 4/307:05 pmPDX - ONT
1 stop4h 36mDelta
Deal found 3/28$197

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 28, 2025.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.

Fly from

Ontario

Fly to

Washington

Route

Depart

Return

Price

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 4/18

10:12 am-1:06 pm

Nonstop2h 54m

Seattle/Tacoma Intl

Mon 4/21

12:46 pm-3:25 pm

Nonstop2h 39m

$98

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 5/1

4:29 pm-7:32 pm

Nonstop3h 03m

Seattle/Tacoma Intl

Tue 5/6

5:55 pm-8:29 pm

Nonstop2h 34m

$149

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 5/7

1:45 pm-9:31 pm

1 stop7h 46m

Seattle/Tacoma Intl

Sat 5/17

5:05 am-12:24 pm

1 stop7h 19m

$162

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 4/30

6:00 am-8:46 am

Nonstop2h 46m

Seattle/Tacoma Intl

Tue 5/13

8:13 am-10:51 am

Nonstop2h 38m

$173

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 5/23

2:19 pm-4:50 pm

Nonstop2h 31m

Portland

Mon 5/26

11:04 am-1:24 pm

Nonstop2h 20m

$176

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 4/22

8:59 pm-11:20 pm

Nonstop2h 21m

Portland

Tue 4/29

9:42 pm-11:58 pm

Nonstop2h 16m

$177

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 5/6

11:45 am-2:40 pm

Nonstop2h 55m

Seattle/Tacoma Intl

Tue 5/20

11:30 am-2:15 pm

Nonstop2h 45m

$177

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 4/30

7:00 am-9:26 am

Nonstop2h 26m

Portland

Wed 5/7

9:42 pm-11:58 pm

Nonstop2h 16m

$179

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 5/29

2:19 pm-4:50 pm

Nonstop2h 31m

Portland

Tue 6/3

7:00 am-9:17 am

Nonstop2h 17m

$183

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 5/3

6:00 am-8:46 am

Nonstop2h 46m

Seattle/Tacoma Intl

Wed 5/7

8:13 am-10:51 am

Nonstop2h 38m

$187

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Washington

What is the cheapest month to book a flight from Ontario to State of Washington?

Currently, January is the cheapest month in which you can book a flight from Ontario to State of Washington (average of $238). Flying from Ontario to State of Washington in July is currently the most expensive (average of $411). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to WA?

Find hourly flight availability from Ontario to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 28, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to State of Washington as you normally would.

Weekly flight availability from Ontario to State of Washington

Explore weekly flight availability from Ontario to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 28, 2025.

The most flights from ONT to USWA are scheduled on a Friday (19 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 on average).

Rainfall in Washington by month

Plan your trip to Washington by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in State of Washington ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit State of Washington when rainfall is around 0.7 in.

Temperature in Washington by month

Plan your trip to Washington by taking into account the average temperature totals by month.

If weather is an important factor for your trip to State of Washington, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated March 28, 2025.
Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta from Ontario to Washington by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Alaska Airlines
8.0
Very good
9,798 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Delta
8.0
Very good
7,896 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Hawaiian Airlines
7.9
Good
2,335 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Washington?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Washington from Ontario.

  • How popular is this Ontario to State of Washington flight route?

    This flight path from Ontario to Washington was viewed by 199 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines to fly from Ontario to State of Washington one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $49. Users have also found prices from $89 and $89 on Hawaiian Airlines and Delta, respectively.

  • What are the most popular routes from Ontario to State of Washington?

    While some choose either Ontario - Portland or Ontario - Spokane, Ontario - Seattle/Tacoma Intl is the most popular route from Ontario to State of Washington.

  • What are the most reliable airlines from Ontario to State of Washington?

    Before booking your flight to State of Washington from Ontario, check out the most reliable airlines to get you to your destination on time: Qatar Airways (87%), Virgin Atlantic (86%), SkyWest Airlines( 85%).

  • What are the cheapest flights from Ontario to State of Washington?

    Looking at all options, your cheapest flight can be booked for $53. While the most popular route (Ontario - Seattle/Tacoma Intl) can be booked for $108 on average our data indicates $1,580 when flying from Ontario to State of Washington.

  • Can I find deals for flights from Ontario to Washington that include hotel bookings?

    Yes. In addition to deals on Ontario to Washington flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Washington.

  • Can I find deals for business class flights from Ontario to Washington?

    Yes. Cheapflights offers flight deals from Ontario to Washington by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to State of Washington?

    Currently, January is the cheapest month in which you can book a flight from Ontario to State of Washington (average of $238). Flying from Ontario to State of Washington in July is currently the most expensive (average of $411). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Ontario to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Ontario to Washington

Discover the top 7 airlines that operate flights from Ontario to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$63Average$139FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$70Average$130FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$88Average$240FlexibilityNo cancel feeOn-time85%
DeltaCheapest$113Average$291FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$136Average$419FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$150Average$329FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$218Average$481FlexibilityNo cancel feeOn-time69%
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