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$61+ Cheap flights from Washington to Ontario (ONT)

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 1/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap flight deals from Washington to Ontario

Keep the following information in mind while searching for Washington to Ontario flight deals. Data was last updated October 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$116
(Frontier)

One-way from

$61
(Frontier)

Popular in

December

Cheapest in

January

Average price

$238

Good round-trip deal

$184 or less

Good one-way deal

$104 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Los Angeles flights.
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From Washington to Ontario
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One-way flight from Washington to Ontario
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Washington to Ontario.
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Price to beat on a one-way flight from Washington to Ontario.
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Find flight deals from Washington to Ontario

Cheapest flights from Washington to Ontario
Explore the most affordable flight options available from Washington to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This Frontier deal was found by Cheapflights users on 10/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1512:52 pmPDX - ONT
1 stop10h 58mFrontier
Sun 11/1612:05 pmONT - PDX
Nonstop2h 26mFrontier
Deal found 10/29$116
This Frontier deal was found by Cheapflights users on 10/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/182:19 pmPDX - ONT
Nonstop2h 10mFrontier
Tue 12/236:17 pmONT - PDX
Nonstop2h 22mFrontier
Deal found 10/29$121
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:47 pmPDX - ONT
1 stop11h 12mFrontier
Thu 1/16:00 amONT - PDX
1 stop7h 24mFrontier
Deal found 10/28$123
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/181:26 pmPDX - ONT
1 stop8h 01mFrontier
Mon 11/2412:29 pmONT - PDX
Nonstop2h 35mFrontier
Deal found 10/30$125
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/148:22 pmSEA - ONT
2 stops16h 15mFrontier
Sun 11/168:02 amONT - SEA
Nonstop2h 53mFrontier
Deal found 10/30$127
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/149:02 pmPDX - ONT
2 stops15h 35mFrontier
Sun 11/1612:05 pmONT - PDX
Nonstop2h 26mFrontier
Deal found 10/30$127
This Mytrip deal was found by Cheapflights users on 10/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1312:58 pmSEA - ONT
1 stop22h 12mFrontier
Fri 11/147:44 pmONT - SEA
1 stop22h 48mFrontier
Deal found 10/30$128
This Frontier deal was found by Cheapflights users on 10/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2811:06 amSEA - ONT
Nonstop2h 36mFrontier
Mon 1/52:45 pmONT - SEA
Nonstop2h 53mFrontier
Deal found 10/29$129
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/212:19 pmPDX - ONT
Nonstop2h 10mFrontier
Tue 12/306:17 pmONT - PDX
Nonstop2h 22mFrontier
Deal found 10/30$129
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/121:37 pmSEA - ONT
1 stop21h 33mFrontier
Thu 11/2012:23 pmONT - SEA
1 stop23h 33mFrontier
Deal found 10/29$130
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1512:52 pmPDX - ONT
1 stop10h 58mFrontier
Mon 11/176:53 amONT - PDX
1 stop29h 03mFrontier
Deal found 10/29$130
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/510:51 amSEA - ONT
Nonstop2h 34mFrontier
Sun 12/75:18 pmONT - SEA
1 stop16h 48mFrontier
Deal found 10/30$131

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to Ontario 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 October 30, 2025.
Use the filters below to find and compare flights from Washington to Ontario that are best for you.

Fly from

Washington

Fly to

Ontario

Route

Depart

Return

Price

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 1/24

3:52 pm-10:53 pm

1 stop7h 01m

Ontario

Mon 1/26

6:00 am-12:33 pm

1 stop6h 33m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 2/19

2:35 pm-4:53 pm

Nonstop2h 18m

Ontario

Wed 2/25

7:00 am-9:24 am

Nonstop2h 24m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/4

10:30 am-12:46 pm

Nonstop2h 16m

Ontario

Sat 12/6

7:10 am-9:41 am

Nonstop2h 31m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 12/10

6:40 am-1:15 pm

1 stop6h 35m

Ontario

Thu 12/11

5:55 am-10:50 am

1 stop4h 55m

$172

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/4

7:09 pm-11:58 pm

1 stop4h 49m

Ontario

Wed 12/10

4:49 pm-12:04 am

1 stop7h 15m

$172

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 12/10

2:19 pm-5:07 pm

Nonstop2h 48m

Ontario

Wed 12/24

2:50 pm-5:50 pm

Nonstop3h 00m

$177

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 1/8

1:35 pm-5:43 pm

1 stop4h 08m

Ontario

Fri 1/9

6:00 am-12:33 pm

1 stop6h 33m

$177

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 12/3

7:00 am-11:55 am

1 stop4h 55m

Ontario

Sun 12/7

6:25 am-12:05 pm

1 stop5h 40m

$177

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 1/10

12:31 pm-3:08 pm

Nonstop2h 37m

Ontario

Sat 1/17

4:03 pm-6:54 pm

Nonstop2h 51m

$177

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 12/13

8:05 pm-10:47 pm

Nonstop2h 42m

Ontario

Wed 12/24

2:50 pm-5:50 pm

Nonstop3h 00m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

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

Have a flexible travel schedule? Discover the best time to fly to Ontario from Washington 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 Washington to Ontario

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

Currently, January is the cheapest month in which you can book a flight from State of Washington to Ontario (average of $38). Flying from State of Washington to Ontario in November is currently the most expensive (average of $81). 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 WA to ONT?

Find hourly flight availability from Washington to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 30, 2025.

A simple way to save on the total cost of your ticket is to fly from State of Washington to Ontario in the evening. If you’re flexible enough to do this you can expect to save up to 38% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from State of Washington to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Washington to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their State of Washington to Ontario flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Washington to Ontario. 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 into for flights to Ontario from Washington?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from Washington. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

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

    Flights from Washington to Ontario have been viewed 62 times in the past calendar month.

  • How long is the flight from State of Washington to Ontario?

    Airlines like United Airlines, Alaska Airlines, and Southwest fly from State of Washington to Ontario in about 2h 18m. The time it takes to get you to your destination can typically vary by up to 4h 43m. The distance from State of Washington to Ontario is about 839 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    One-way options have recently been found by users for as low as $75 on Frontier. Other airlines that offer cheap prices include Southwest from $84 and Alaska Airlines from $88 one-way.

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

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

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

    The top 3 most reliable airlines when flying from State of Washington to Ontario are Delta (96%), SkyWest Airlines (95%) and WestJet (92%).

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

    The cheapest flight price from State of Washington to Ontario is $58. On average you can expect to pay $258. The most popular route, (Seattle/Tacoma Intl - Ontario), can usually be booked for $87.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington to Ontario 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 State of Washington to Ontario?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to Ontario (average of $38). Flying from State of Washington to Ontario in November is currently the most expensive (average of $81). 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.

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Top 6 airlines flying from Washington to Ontario

Discover the top 6 airlines that operate flights from Washington to Ontario. 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$71Average$169FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$98Average$237FlexibilityNo cancel feeOn-time85%
DeltaCheapest$118Average$289FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$129Average$356FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$130Average$321FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$158Average$329FlexibilityNo cancel feeOn-time69%

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