Frontier's UpFront Plus offers a guaranteed empty middle seat for extra comfort.
Frontier Airlines' Zone 1 boarding is available with carry-on purchase or special fare bundles.
$58+ 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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Jun 18 — Jun 251
1 adult, Economy
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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 September or August, booked 79 days in advance, depart on a Thursday or Friday and return on a Saturday
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 Jun 13, 2025.
Round-trip from | $99 (Frontier) |
|---|---|
One-way from | $58 (Kiwi.com) |
Popular in | March |
Cheapest in | September |
Average price | $178 |
Good round-trip deal | $128 or less |
Good one-way deal | $76 or less |
Find flight deals from Portland to Ontario
Cheapest flights from Portland to OntarioExplore 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 Jun 13, 2025.
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 Jun 13, 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.
Khamis 8/711:13 amPDX - ONT
Nonstop2h 23mFrontier
Isnin 8/112:31 pmONT - PDX
Nonstop2h 18mFrontier
Deal found 6/12![Frontier logo]()
$99
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 9/167:03 amPDX - ONT
Nonstop2h 23mAlaska Airlines
Selasa 9/2310:06 amONT - PDX
Nonstop2h 19mAlaska Airlines
Deal found 6/12![Alaska Airlines logo]()
$177
This Southwest deal was found by Cheapflights users on 6/13. 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.
Jumaat 8/155:25 amPDX - ONT
1 stop7h 15mSouthwest
Selasa 8/192:45 pmONT - PDX
1 stop7h 35mSouthwest
Deal found 6/13![Southwest logo]()
$198
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 7/1111:13 amPDX - ONT
Nonstop2h 23mMultiple Airlines
Rabu 7/166:10 pmONT - PDX
Nonstop2h 17mMultiple Airlines
Deal found 6/10![Multiple Airlines logo]()
$208
This Hawaiian Airlines deal was found by Cheapflights users on 6/11. 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.
Rabu 7/27:01 amPDX - ONT
Nonstop2h 22mHawaiian Airlines
Sabtu 7/56:10 pmONT - PDX
Nonstop2h 17mHawaiian Airlines
Deal found 6/11![Hawaiian Airlines logo]()
$217
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sabtu 9/133:15 pmPDX - ONT
1 stop7h 27mDelta
Rabu 9/245:05 pmONT - PDX
1 stop6h 43mDelta
Deal found 6/12![Delta logo]()
$223
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Ahad 9/147:45 amPDX - ONT
1 stop4h 28mUnited Airlines
Sabtu 9/271:53 pmONT - PDX
1 stop6h 57mUnited Airlines
Deal found 6/12![United Airlines logo]()
$248
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 Jun 13, 2025.
Use the filters below to find and compare flights from Portland to Ontario that are best for you.
Fly from
Portland
Fly to
Ontario
Route
Depart
Return
Price
PortlandOntario
PDX - ONT
PDXONT
Portland
Khamis 8/7
11:13 am-1:36 pm
Nonstop2h 23m
Ontario
Isnin 8/11
2:31 pm-4:49 pm
Nonstop2h 18m
$99
PortlandOntario
PDX - ONT
PDXONT
Portland
Selasa 9/16
7:03 am-9:26 am
Nonstop2h 23m
Ontario
Selasa 9/23
10:06 am-12:25 pm
Nonstop2h 19m
$177
PortlandOntario
PDX - ONT
PDXONT
Portland
Jumaat 8/15
5:25 am-12:40 pm
1 stop7h 15m
Ontario
Selasa 8/19
2:45 pm-10:20 pm
1 stop7h 35m
$198
PortlandOntario
PDX - ONT
PDXONT
Portland
Jumaat 7/11
11:13 am-1:36 pm
Nonstop2h 23m
Ontario
Rabu 7/16
6:10 pm-8:27 pm
Nonstop2h 17m
$208
PortlandOntario
PDX - ONT
PDXONT
Portland
Rabu 7/2
7:01 am-9:23 am
Nonstop2h 22m
Ontario
Sabtu 7/5
6:10 pm-8:27 pm
Nonstop2h 17m
$217
PortlandOntario
PDX - ONT
PDXONT
Portland
Sabtu 9/13
5:05 pm-10:46 pm
1 stop5h 41m
Ontario
Isnin 9/22
9:55 am-4:26 pm
1 stop6h 31m
$223
PortlandOntario
PDX - ONT
PDXONT
Portland
Ahad 9/14
7:45 am-12:13 pm
1 stop4h 28m
Ontario
Sabtu 9/27
1:53 pm-8:50 pm
1 stop6h 57m
$248
PortlandOntario
PDX - ONT
PDXONT
Portland
Khamis 8/7
5:05 am-11:32 am
1 stop6h 27m
Ontario
Isnin 8/11
12:22 pm-7:23 pm
1 stop7h 01m
$275
PortlandOntario
PDX - ONT
PDXONT
Portland
Jumaat 7/4
11:13 am-1:35 pm
Nonstop2h 22m
$58
PortlandOntario
PDX - ONT
PDXONT
Portland
Selasa 8/26
7:03 am-9:26 am
Nonstop2h 23m
$89
Showing 1-10 of 16 results
The best insider tips for Portland to Ontario flights
Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Portland to Ontario trip
Airlines
![Frontier]()
Frontier
![Alaska Airlines]()
Alaska Airlines
Alaska Airlines offers 32” legroom in Main Cabin, enhancing comfort on short domestic flights.
Alaska Airlines' Wi-Fi is available for a flat fee, ideal for working during flights.
Airports
Our travel experts
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?
Use this chart to determine the optimal time to book a round-trip flight from Portland to Ontario. Price data was last updated on June 9, 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 79 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 $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 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 Jun 13, 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 23% 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 June 8, 2025.
Travelers seeking maximum savings on their Portland to Ontario flight should consider departing on Saturday at noon 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.
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 Jun 13, 2025.
The most flights from PDX to ONT are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 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 Jun 13, 2025.
See what other customers who have flown with Alaska Airlines, Southwest 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.
Overall
8.0
Comfort
7.8
Entertainment
7.1
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Overall
8.0
Comfort
7.8
Entertainment
7.1
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Overall
8.0
Comfort
7.8
Entertainment
7.1
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Overall
8.0
Comfort
7.8
Entertainment
7.1
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Overall
8.0
Comfort
7.8
Entertainment
7.1
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Overall
8.0
Comfort
7.8
Entertainment
7.1
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
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.
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Alternative routes for Portland to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Top 7 airlines flying from Portland to Ontario
Discover the top 7 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 Jun 13, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$132 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$68 | Average$120 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$93 | Average$286 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$108 | Average$299 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$156 | Average$280 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$166 | Average$356 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$192 | Average$330 | FlexibilityNo cancel fee | On-time63% |