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$69+ 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 5/22. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Mar 2 — Mar 91
Sun 3/2
Sun 3/9
1 adult, Economy
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The best prices from Portland to Ontario are usually found in September or May, booked 89 days in advance, depart on a Tuesday or Saturday and return on a Tuesday

Cheap 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 February 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$156
(Cheapflightsfares)

One-way from

$69
(Cheapflightsfares)

Popular in

March

Cheapest in

September

Average price

$276

Good round-trip deal

$187 or less

Good one-way deal

$98 or less
Provider with most accurate pricing for Portland-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Ontario flights.
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From Portland to Ontario
Search Deals
One-way flight from Portland to Ontario
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($71 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2025
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.
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Find 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 February 25, 2025.

This Frontier deal was found by Cheapflights users on 2/24. 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 5/292:54 pmPDX - ONT
Nonstop2h 21mFrontier
Fri 5/3011:28 amONT - PDX
Nonstop2h 26mFrontier
Deal found 2/24$138
This American Airlines deal was found by Cheapflights users on 2/24. 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.
Wed 4/911:35 amPDX - ONT
1 stop4h 24mAmerican Airlines
Wed 4/1612:50 pmONT - PDX
1 stop7h 04mAmerican Airlines
Deal found 2/24$167
This Southwest deal was found by Cheapflights users on 2/25. 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.
Fri 4/44:50 pmPDX - ONT
1 stop7h 20mSouthwest
Mon 4/77:50 pmONT - PDX
1 stop3h 40mSouthwest
Deal found 2/25$175
This Hawaiian Airlines deal was found by Cheapflights users on 2/23. 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.
Tue 4/87:05 amPDX - ONT
Nonstop2h 23mHawaiian Airlines
Wed 4/166:55 amONT - PDX
Nonstop2h 24mHawaiian Airlines
Deal found 2/23$177
This Alaska Airlines deal was found by Cheapflights users on 2/25. 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 3/299:41 pmPDX - ONT
Nonstop2h 18mAlaska Airlines
Wed 4/26:55 amONT - PDX
Nonstop2h 24mAlaska Airlines
Deal found 2/25$187
This Delta deal was found by Cheapflights users on 2/24. 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.
Fri 3/147:05 pmPDX - ONT
1 stop4h 51mDelta
Mon 3/175:30 pmONT - PDX
1 stop6h 29mDelta
Deal found 2/24$217
This Expedia deal was found by Cheapflights users on 2/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/49:41 pmPDX - ONT
Nonstop2h 18mMultiple Airlines
Mon 4/74:25 pmONT - PDX
1 stop8h 12mMultiple Airlines
Deal found 2/24$226
This United Airlines deal was found by Cheapflights users on 2/24. 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.
Sun 6/15:30 amPDX - ONT
1 stop6h 44mUnited Airlines
Sun 6/86:00 amONT - PDX
1 stop6h 33mUnited Airlines
Deal found 2/24$232

Find flights from Portland to Ontario within your budget

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 February 25, 2025.

Fly from

Portland

Fly to

Ontario

Route

Depart

Return

Price

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 5/22

2:54 pm-5:15 pm

Nonstop2h 21m

Ontario

Mon 5/26

11:28 am-1:54 pm

Nonstop2h 26m

$156

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 4/9

11:35 am-3:59 pm

1 stop4h 24m

Ontario

Wed 4/16

12:50 pm-7:54 pm

1 stop7h 04m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 4/4

4:50 pm-12:10 am

1 stop7h 20m

Ontario

Mon 4/7

7:50 pm-11:30 pm

1 stop3h 40m

$175

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 4/8

9:41 pm-11:59 pm

Nonstop2h 18m

Ontario

Wed 4/16

5:44 pm-8:07 pm

Nonstop2h 23m

$177

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 4/19

7:05 am-9:28 am

Nonstop2h 23m

Ontario

Sun 4/20

7:00 am-9:24 am

Nonstop2h 24m

$196

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 4/29

6:03 pm-8:19 pm

Nonstop2h 16m

Ontario

Thu 5/1

10:52 am-3:42 pm

1 stop4h 50m

$216

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 3/14

7:05 pm-11:56 pm

1 stop4h 51m

Ontario

Mon 3/17

5:30 pm-11:59 pm

1 stop6h 29m

$217

PortlandOntario

PDX - ONT

PDXONT

Portland

Mon 3/10

3:38 pm-8:10 pm

1 stop4h 32m

Ontario

Wed 3/19

6:00 am-12:37 pm

1 stop6h 37m

$287

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 5/22

2:54 pm-5:15 pm

Nonstop2h 21m

$69

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 3/18

6:30 am-1:30 pm

1 stop7h 00m

$77

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/24

Showing 1-10 of 15 results
1
2

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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
Kiwi.comPrice Accuracy3 starsTrust Score*2 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
FlightnetworkPrice Accuracy2 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars
CheapOairPrice Accuracy1 starTrust Score*3 stars

*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.

Travel insights for flights from Portland to Ontario

Get recent, data-driven insights about flights from Portland to Ontario including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from Portland to Ontario. Price data was last updated on February 14, 2025.

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 73 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, August is the cheapest month in which you can book a flight from Portland to Ontario (average of $246). Flying from Portland to Ontario in March is currently the most expensive (average of $313). 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 February 25, 2025.

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 afternoon, which can drop the price by up to 24% versus a flight in the evening.

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 February 23, 2025.

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

Weekly flight availability from Portland to Ontario

Explore weekly flight availability from Portland 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 February 25, 2025.

The most flights from PDX to ONT are scheduled on a Monday (6 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 February 25, 2025.
See what other customers who have flown with Southwest, Alaska Airlines and Delta from Portland to Ontario have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,374 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.7

Overall

8.1

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
4,374 reviews
Southwest
8.1
Very good
4,374 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.7

Overall

8.1

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
9,712 reviews
Southwest
8.1
Very good
4,374 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.7

Overall

8.1

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
8,165 reviews
Southwest
8.1
Very good
4,374 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.7

Overall

8.1

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
2,312 reviews
Southwest
8.1
Very good
4,374 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.7

Overall

8.1

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
8,733 reviews
Southwest
8.1
Very good
4,374 reviews

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.7

Overall

8.1

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 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 14m.

  • How popular is this Portland to Ontario flight route?

    Flights from Portland to Ontario have been viewed 171 times in the past calendar month.

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

    Frontier, at $156, was found to be the cheapest airline from Portland to Ontario.Alternate airlines to your destination round-trip include American Airlines and Southwest. Frontier is priced at 18% 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 $69. Users have also found prices from $77 and $84 on Southwest and American 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 Southwest (100%), Horizon Air (100%) and British Airways (100%).

  • What are the cheapest flights from Portland to Ontario?

    While on average a flight from Portland to Ontario is generally $211, our data shows the cheapest flight currently is $50. When looking at the most popular route, (Portland - Ontario), you can expect to pay $106 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, August is the cheapest month in which you can book a flight from Portland to Ontario (average of $246). Flying from Portland to Ontario in March is currently the most expensive (average of $313). 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 Portland to Ontario

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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 February 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$125FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$68Average$120FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$156Average$283FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$171Average$355FlexibilityNo cancel feeOn-time69%
DeltaCheapest$187Average$366FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$196Average$368FlexibilityNo cancel feeOn-time63%
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