Ontario

$59+ 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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
Jul 8 — Jul 151
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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 July 3, 2025.

Round-trip from

$99
(Frontier)

One-way from

$59
(Frontier)

Popular in

June

Cheapest in

January

Average price

$237

Good round-trip deal

$184 or less

Good one-way deal

$112 or less
From Washington to Ontario
One-way flight from Washington to Ontario
Highest demand for flights based on searches. 11% potential increase in price ($27 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Average for round-trip flights in July 2025
Price to beat on a round-trip flight from Washington to Ontario.
Price to beat on a one-way flight from Washington to Ontario.

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 July 3, 2025.

This Frontier deal was found by Cheapflights users on 7/1. 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 8/811:13 amPDX - ONT
Nonstop2h 23mFrontier
Sat 8/163:43 pmONT - PDX
Nonstop2h 23mFrontier
Deal found 7/1$99
This Frontier deal was found by Cheapflights users on 7/3. 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 7/311:42 pmSEA - ONT
Nonstop2h 54mFrontier
Wed 8/610:03 amONT - SEA
Nonstop2h 50mFrontier
Deal found 7/3$133
This Delta deal was found by Cheapflights users on 7/3. 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.
Wed 7/307:30 amSEA - ONT
Nonstop2h 55mDelta
Tue 8/56:25 amONT - SEA
Nonstop2h 48mDelta
Deal found 7/3$157
This Alaska Airlines deal was found by Cheapflights users on 7/1. 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 7/295:25 amSEA - ONT
1 stop3h 58mAlaska Airlines
Wed 8/1310:03 amONT - SEA
1 stop4h 22mAlaska Airlines
Deal found 7/1$176
This Alaska Airlines deal was found by Cheapflights users on 7/1. 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 8/93:46 pmPSC - ONT
1 stop8h 29mAlaska Airlines
Sun 8/3111:39 amONT - PSC
1 stop7h 39mAlaska Airlines
Deal found 7/1$218
This Trip.com deal was found by Cheapflights users on 7/1. 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.
Mon 8/49:00 pmBLI - ONT
1 stop24h 52mMultiple Airlines
Mon 8/116:00 amONT - BLI
1 stop14h 10mMultiple Airlines
Deal found 7/1$222
This FlightHub deal was found by Cheapflights users on 7/2. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/3111:58 amGEG - ONT
1 stop11h 52mFrontier
Mon 8/45:21 pmONT - GEG
1 stop17h 45mFrontier
Deal found 7/2$222
This Hawaiian Airlines deal was found by Cheapflights users on 7/2. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/135:56 amGEG - ONT
1 stop4h 48mHawaiian Airlines
Mon 11/174:09 pmONT - GEG
1 stop5h 10mHawaiian Airlines
Deal found 7/2$236
This Delta deal was found by Cheapflights users on 6/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/107:07 pmGEG - ONT
1 stop4h 39mDelta
Mon 12/155:51 pmONT - GEG
1 stop4h 56mDelta
Deal found 6/30$237
This American Airlines deal was found by Cheapflights users on 7/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/292:55 pmPSC - ONT
1 stop6h 43mAmerican Airlines
Tue 8/56:15 amONT - PSC
1 stop7h 17mAmerican Airlines
Deal found 7/1$239
This Southwest deal was found by Cheapflights users on 7/2. 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 8/211:10 pmGEG - ONT
2 stops6h 45mSouthwest
Mon 8/255:50 amONT - GEG
1 stop4h 55mSouthwest
Deal found 7/2$242
This Alaska Airlines deal was found by Cheapflights users on 7/1. 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 8/96:07 pmGEG - ONT
1 stop6h 08mAlaska Airlines
Mon 8/112:22 pmONT - GEG
1 stop6h 47mAlaska Airlines
Deal found 7/1$243

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 July 3, 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

Fri 8/8

11:13 am-1:36 pm

Nonstop2h 23m

Ontario

Sat 8/16

3:43 pm-6:06 pm

Nonstop2h 23m

$99

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 7/31

1:42 pm-4:36 pm

Nonstop2h 54m

Ontario

Tue 8/5

10:03 am-12:53 pm

Nonstop2h 50m

$133

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 7/30

7:30 am-10:25 am

Nonstop2h 55m

Ontario

Tue 8/5

6:25 am-9:13 am

Nonstop2h 48m

$157

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 7/29

5:25 am-9:23 am

1 stop3h 58m

Ontario

Wed 8/13

10:03 am-2:25 pm

1 stop4h 22m

$176

PascoOntario

PSC - ONT

PSCONT

Pasco Tri Cities

Sat 8/9

3:46 pm-12:15 am

1 stop8h 29m

Ontario

Sun 8/31

11:39 am-7:18 pm

1 stop7h 39m

$218

BellinghamOntario

BLI - ONT

BLIONT

Bellingham

Mon 8/4

9:00 pm-9:52 pm

1 stop24h 52m

Ontario

Mon 8/11

6:00 am-8:10 pm

1 stop14h 10m

$222

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Thu 7/31

11:58 am-11:50 pm

1 stop11h 52m

Ontario

Mon 8/4

5:21 pm-11:06 am

1 stop17h 45m

$222

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Thu 11/13

5:56 am-10:44 am

1 stop4h 48m

Ontario

Mon 11/17

4:09 pm-9:19 pm

1 stop5h 10m

$236

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Wed 12/10

7:07 pm-11:46 pm

1 stop4h 39m

Ontario

Mon 12/15

5:51 pm-10:47 pm

1 stop4h 56m

$237

PascoOntario

PSC - ONT

PSCONT

Pasco Tri Cities

Tue 7/29

2:55 pm-9:38 pm

1 stop6h 43m

Ontario

Tue 8/5

6:15 am-1:32 pm

1 stop7h 17m

$239

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 49 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, August is the cheapest month in which you can book a flight from State of Washington to Ontario (average of $246). Flying from State of Washington to Ontario in March is currently the most expensive (average of $328). 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 July 3, 2025.

When flying from State of Washington to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from State of Washington to Ontario

Explore weekly flight availability from Washington to Ontario. 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 July 3, 2025.

The most flights from USWA to ONT are scheduled on a Thursday (25 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (8 on average).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated July 3, 2025.
Read through reviews of airlines operating flights from Washington to Ontario, such as Alaska Airlines, Southwest, and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
8.0
Very good

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Comfort

7.8

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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?

  • 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 $59 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $88 and American Airlines from $100 one-way.

  • What are the most popular routes 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 Aeromexico (100%), Virgin Atlantic (95%) and KLM (94%).

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

    The cheapest flight price from State of Washington to Ontario is $79. On average you can expect to pay $189. The most popular route, (Seattle/Tacoma Intl - Ontario), can usually be booked for $121.

  • 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, August is the cheapest month in which you can book a flight from State of Washington to Ontario (average of $246). Flying from State of Washington to Ontario in March is currently the most expensive (average of $328). 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 Washington to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top 7 airlines flying from Washington to Ontario

Discover the top 7 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$148FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$59Average$100FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$98Average$251FlexibilityNo cancel feeOn-time85%
DeltaCheapest$117Average$285FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$129Average$420FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$196Average$350FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$308Average$443FlexibilityNo cancel feeOn-time69%

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