HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$92+ Cheap flights from Portland to Ontario (PDX - 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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Jun 19 — Jun 261
Fri 6/19
Fri 6/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portland to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Portland to Ontario are usually found in July or August, booked 72 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap flight deals from Portland to Ontario

Cheapest flights from Portland to Ontario
Explore the most affordable flight options available from Portland to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 20, 2026.

This United Airlines deal was found by Cheapflights users on 5/16. 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.
Thu 9/177:00 am
PDX
-
ONT
1 stop5h 12m
United Airlines
Sat 9/265:00 am
ONT
-
PDX
1 stop8h 16m
United Airlines
Deal found 5/16$207
This Frontier deal was found by Cheapflights users on 5/18. 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 8/185:42 pm
PDX
-
ONT
1 stop6h 07m
Frontier
Sun 8/2311:43 am
ONT
-
PDX
1 stop5h 41m
Frontier
Deal found 5/18$210
This Mytrip deal was found by Cheapflights users on 5/15. 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.
Wed 7/15:20 pm
PDX
-
ONT
1 stop16h 45m
Frontier
Sat 7/410:50 am
ONT
-
PDX
1 stop6h 07m
Frontier
Deal found 5/15$213
This CheapOair deal was found by Cheapflights users on 5/17. 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.
Tue 8/185:42 pm
PDX
-
ONT
1 stop16h 23m
Frontier
Thu 8/203:34 pm
ONT
-
PDX
1 stop25h 50m
Frontier
Deal found 5/17$214
This Frontier deal was found by Cheapflights users on 5/15. 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 9/123:22 pm
PDX
-
ONT
1 stop8h 33m
Frontier
Sat 9/196:00 am
ONT
-
PDX
1 stop10h 35m
Frontier
Deal found 5/15$218
This CheapOair deal was found by Cheapflights users on 5/16. 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.
Mon 6/298:42 pm
PDX
-
ONT
1 stop23h 09m
Frontier
Wed 7/16:00 am
ONT
-
PDX
1 stop10h 35m
Frontier
Deal found 5/16$219
This CheapOair deal was found by Cheapflights users on 5/16. 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.
Fri 7/312:26 pm
PDX
-
ONT
1 stop21h 39m
Frontier
Tue 7/76:00 am
ONT
-
PDX
1 stop10h 31m
Frontier
Deal found 5/16$220
This United Airlines deal was found by Cheapflights users on 5/15. 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.
Sat 6/65:15 am
PDX
-
ONT
1 stop6h 57m
United Airlines
Wed 6/101:50 pm
ONT
-
PDX
1 stop7h 04m
United Airlines
Deal found 5/15$222
This Frontier deal was found by Cheapflights users on 5/16. 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.
Mon 8/312:26 pm
PDX
-
ONT
1 stop11h 24m
Frontier
Mon 8/1011:43 am
ONT
-
PDX
1 stop6h 21m
Frontier
Deal found 5/16$223
This Frontier deal was found by Cheapflights users on 5/16. 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 6/25:46 pm
PDX
-
ONT
1 stop6h 03m
Frontier
Sat 6/66:00 am
ONT
-
PDX
1 stop10h 46m
Frontier
Deal found 5/16$224
This Trip.com deal was found by Cheapflights users on 5/19. 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.
Fri 8/76:59 pm
PDX
-
ONT
1 stop24h 54m
Frontier
Wed 8/123:40 pm
ONT
-
PDX
1 stop26h 24m
Frontier
Deal found 5/19$226
This Delta deal was found by Cheapflights users on 5/15. 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 8/53:25 pm
PDX
-
ONT
1 stop7h 20m
Delta
Wed 8/126:20 am
ONT
-
PDX
1 stop5h 20m
Delta
Deal found 5/15$227

Find flight deals from Portland to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$210
(Frontier)

One-way from

$92
(Super.com)

Popular in

March

Cheapest in

July

Average price

$280

Good round-trip deal

$297 or less

Good one-way deal

$168 or less
Provider with most accurate pricing for Portland-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Ontario flights.
Search Deals
From Portland to Ontario
Search Deals
One-way flight from Portland to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from Portland to Ontario.
Search Deals
Price to beat on a one-way flight from Portland to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland 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 May 20, 2026.
Use the filters below to find and compare flights from Portland to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 6/28

7:00 am-12:12 pm

1 stop5h 12m

Ontario

Sun 7/5

6:00 am-10:20 am

1 stop4h 20m

$259

PortlandOntario

PDX - ONT

PDXONT

Portland

Mon 6/15

10:40 pm-7:30 am

1 stop8h 50m

Ontario

Mon 6/22

8:45 pm-1:20 am

1 stop4h 35m

$264

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 6/11

9:30 pm-11:51 pm

Nonstop2h 21m

Ontario

Sat 6/20

7:00 am-9:15 am

Nonstop2h 15m

$307

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 7/10

8:19 am-1:09 pm

1 stop4h 50m

Ontario

Wed 7/15

10:54 am-1:09 pm

Nonstop2h 15m

$347

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 6/3

9:31 pm-11:56 pm

Nonstop2h 25m

Ontario

Sat 6/6

7:00 am-9:24 am

Nonstop2h 24m

$387
Quickest round-trip

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 7/16

7:36 am-9:56 am

Nonstop2h 20m

Ontario

Sun 7/19

10:54 am-1:09 pm

Nonstop2h 15m

$392

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 6/28

5:30 am-12:20 pm

2 stops6h 50m

Ontario

Sun 7/5

5:40 am-9:20 am

1 stop3h 40m

$398

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 6/27

10:45 am-6:03 pm

1 stop7h 18m

Ontario

Sun 6/28

7:00 am-9:15 am

Nonstop2h 15m

$415

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 6/13

5:45 am-12:10 pm

1 stop6h 25m

Ontario

Mon 6/15

5:21 pm-11:46 pm

1 stop6h 25m

$429

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 6/13

9:30 pm-11:51 pm

Nonstop2h 21m

Ontario

Sun 6/14

10:54 am-1:09 pm

Nonstop2h 15m

$432

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/17

Showing 1-10 of 24 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Portland to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Ontario in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy2 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Portland to Ontario

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

How far ahead should I book a flight from Portland to Ontario?

The price you pay for your flight from Portland to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 71 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Portland to Ontario?

Currently, July is the cheapest month in which you can book a flight from Portland to Ontario (average of $168). Flying from Portland to Ontario in March is currently the most expensive (average of $301). 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 PDX to ONT?

Find hourly flight availability from Portland 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 May 20, 2026.

When flying from Portland to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 37% versus a flight in the afternoon.

What is the cheapest day to fly from Portland to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Portland to Ontario. Price data was last updated on May 16, 2026.

Travelers seeking maximum savings on their Portland to Ontario flight should consider departing on Friday evenings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Portland to Ontario?

The best insider tips for Portland to Ontario flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Portland to Ontario trip
Our travel experts
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Bill Fink

Bill Fink

Expert on ONT

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Brandon Schultz

Brandon Schultz

Expert on PDX

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

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 May 20, 2026.
Read through reviews of airlines operating flights from Portland to Ontario, such as Alaska Airlines,Southwest, andHawaiian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,385 reviews

Comfort

7.8

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
Alaska Airlines
7.9
Good
12,385 reviews
Alaska Airlines
7.9
Good
12,385 reviews

Comfort

7.8

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
Southwest
7.9
Good
4,285 reviews
Alaska Airlines
7.9
Good
12,385 reviews

Comfort

7.8

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
Hawaiian Airlines
7.8
Good
2,836 reviews
Alaska Airlines
7.9
Good
12,385 reviews

Comfort

7.8

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
United Airlines
7.4
Good
9,736 reviews
Alaska Airlines
7.9
Good
12,385 reviews

Comfort

7.8

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
Frontier
5.7
Fair
2,944 reviews
Alaska Airlines
7.9
Good
12,385 reviews

Comfort

7.8

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.

Related info for your journey

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

  • What airports do I use to fly from Portland to Ontario?

    You will need to book a flight from Portland to Ontario if you want to fly from Portland to Ontario. At least 6 different airlines have flights from Portland (PDX) to Ontario (ONT) on a regular basis. There are 4 flights to Ontario from the Portland airport per day. If you manage to book one that is nonstop, then you can expect the flight time from PDX to ONT to be around 2h 17m.

  • How popular is this Portland to Ontario flight route?

    Flights from Portland to Ontario have been viewed 28 times in the past calendar month.

  • How long is the flight from Portland to Ontario?

    Airlines like United Airlines, Southwest, and Alaska Airlines fly from Portland to Ontario in about 2h 21m. The time it takes to get you to your destination can typically vary by up to 6h 29m. Airlines will cover a distance of 839 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Portland to Ontario round-trip?

    Frontier, at $51, was found to be the cheapest airline from Portland to Ontario.Alternate airlines to your destination round-trip include Delta and Hawaiian Airlines. Frontier is priced at 77% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Portland to Ontario one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $54. Users have also found prices from $75 and $88 on Southwest and United Airlines, respectively.

  • What are the most reliable airlines from Portland to Ontario?

    The top 3 most reliable airlines when flying from Portland to Ontario are SkyWest Airlines (100%), Hawaiian Airlines (89%) and British Airways (71%).

  • What are the cheapest flights from Portland to Ontario?

    While on average a flight from Portland to Ontario is generally $348, our data shows the cheapest flight currently is $138. When looking at the most popular route, (Portland - Ontario), you can expect to pay $216 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portland 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 Portland to Ontario?

    Currently, July is the cheapest month in which you can book a flight from Portland to Ontario (average of $168). Flying from Portland to Ontario in March is currently the most expensive (average of $301). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 6 airlines flying from Portland to Ontario

Discover the top 6 airlines that operate flights from Portland 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 May 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$51Average$146FlexibilityNo cancel feeOn-time62%
DeltaCheapest$83Average$187FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$88Average$218FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$142Average$229FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$157Average$284FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$161Average$265FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.