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$58+ 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 7/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$99
(Frontier)

One-way from

$58
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$267

Good round-trip deal

$178 or less

Good one-way deal

$114 or less
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. 12% potential increase in price ($28 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in June 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 junio 12, 2025.

This Frontier deal was found by Cheapflights users on 6/12. 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.
mar. 7/83:43 pmONT - PDX
Nonstop2h 23mFrontier
vie. 7/1111:13 amPDX - ONT
Nonstop2h 23mFrontier
Deal found 6/12$99
This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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.
mié. 8/610:03 amONT - SEA
Nonstop2h 50mFrontier
sáb. 8/161:42 pmSEA - ONT
Nonstop2h 54mFrontier
Deal found 6/10$126
This Vliegwinkel deal was found by Cheapflights users on 6/9. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 7/124:00 pmONT - GEG
1 stop5h 09mHawaiian Airlines
mié. 7/169:45 amGEG - ONT
1 stop5h 01mHawaiian Airlines
Deal found 6/9$161
This Kissandfly.com deal was found by Cheapflights users on 6/9. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 7/124:00 pmONT - GEG
1 stop5h 09mMultiple Airlines
mié. 7/166:07 pmGEG - ONT
1 stop6h 06mMultiple Airlines
Deal found 6/9$171
This Kissandfly.com deal was found by Cheapflights users on 6/9. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 7/124:00 pmONT - GEG
1 stop6h 56mAlaska Airlines
mié. 7/166:07 pmGEG - ONT
1 stop6h 06mAlaska Airlines
Deal found 6/9$173
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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.
sáb. 8/166:10 pmONT - PDX
Nonstop2h 17mAlaska Airlines
mar. 8/197:01 amPDX - ONT
Nonstop2h 22mAlaska Airlines
Deal found 6/10$177
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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.
sáb. 9/136:00 amONT - SEA
Nonstop2h 45mAlaska Airlines
sáb. 9/207:55 amSEA - ONT
Nonstop2h 49mAlaska Airlines
Deal found 6/10$177
This Delta deal was found by Cheapflights users on 6/10. 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.
vie. 7/255:59 pmONT - GEG
1 stop4h 49mDelta
mar. 7/296:13 amGEG - ONT
1 stop7h 21mDelta
Deal found 6/10$179
This Southwest deal was found by Cheapflights users on 6/10. 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.
jue. 7/102:15 pmONT - GEG
2 stops10h 15mSouthwest
jue. 7/172:40 pmGEG - ONT
1 stop6h 30mSouthwest
Deal found 6/10$190
This Southwest deal was found by Cheapflights users on 6/10. 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.
mar. 7/84:25 pmONT - PDX
1 stop5h 45mSouthwest
jue. 7/105:00 amPDX - ONT
1 stop5h 25mSouthwest
Deal found 6/10$199
This Southwest deal was found by Cheapflights users on 6/12. 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.
jue. 8/216:20 pmONT - SEA
1 stop4h 45mSouthwest
lun. 8/255:00 amSEA - ONT
2 stops7h 40mSouthwest
Deal found 6/12$202
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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.
mar. 7/86:00 amONT - PSC
1 stop4h 49mAlaska Airlines
mar. 7/157:52 pmPSC - ONT
1 stop15h 13mAlaska Airlines
Deal found 6/10$218

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 junio 12, 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

OntarioPortland

ONT - PDX

ONTPDX

Ontario

mar. 7/8

3:43 pm-6:06 pm

Nonstop2h 23m

Portland

jue. 7/17

11:13 am-1:36 pm

Nonstop2h 23m

$99

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

mié. 8/6

10:03 am-12:53 pm

Nonstop2h 50m

Seattle/Tacoma Intl

sáb. 8/16

1:42 pm-4:36 pm

Nonstop2h 54m

$126

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

sáb. 7/12

4:00 pm-9:09 pm

1 stop5h 09m

Spokane

mié. 7/16

9:45 am-2:46 pm

1 stop5h 01m

$161

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

sáb. 7/12

4:00 pm-9:09 pm

1 stop5h 09m

Spokane

mié. 7/16

6:07 pm-12:13 am

1 stop6h 06m

$171

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

sáb. 7/12

4:00 pm-10:56 pm

1 stop6h 56m

Spokane

mié. 7/16

6:07 pm-12:13 am

1 stop6h 06m

$173

OntarioPortland

ONT - PDX

ONTPDX

Ontario

sáb. 8/16

6:10 pm-8:27 pm

Nonstop2h 17m

Portland

mar. 8/19

7:01 am-9:23 am

Nonstop2h 22m

$177

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

sáb. 9/13

6:00 am-8:45 am

Nonstop2h 45m

Seattle/Tacoma Intl

sáb. 9/20

7:55 am-10:44 am

Nonstop2h 49m

$177

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

vie. 7/25

5:59 pm-10:48 pm

1 stop4h 49m

Spokane

lun. 7/28

5:35 pm-10:47 pm

1 stop5h 12m

$179

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

jue. 7/10

2:15 pm-12:30 am

2 stops10h 15m

Spokane

jue. 7/17

2:40 pm-9:10 pm

1 stop6h 30m

$190

OntarioPortland

ONT - PDX

ONTPDX

Ontario

lun. 8/18

7:30 am-9:44 am

Nonstop2h 14m

Portland

jue. 8/21

9:30 pm-11:53 pm

Nonstop2h 23m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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 $391). 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 junio 12, 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 junio 12, 2025.

The most flights from ONT to USWA are scheduled on a Wednesday (25 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (14 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 junio 12, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

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.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

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.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

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.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

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.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

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.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

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 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 198 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 $58. Users have also found prices from $89 and $89 on Hawaiian Airlines and Alaska Airlines, 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: Air France (100%), LATAM Airlines (100%), Scandinavian Airlines( 100%).

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

    Looking at all options, your cheapest flight can be booked for $58. While the most popular route (Ontario - Seattle/Tacoma Intl) can be booked for $137 on average our data indicates $1,119 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 $391). 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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Alternative routes for Ontario to Washington

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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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$65Average$148FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$70Average$108FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$96Average$332FlexibilityNo cancel feeOn-time85%
DeltaCheapest$114Average$279FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$139Average$393FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$150Average$331FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$233Average$465FlexibilityNo cancel feeOn-time69%

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