$185+ Cheap flights from Portland, ME to Ontario (PWM - ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/13. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — ONT
Oct 24 — Oct 311
Round-trip
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
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Portland to Ontario
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Last-minute
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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 September 24, 2026.
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 September 24, 2026.
This Delta deal was found by Cheapflights users on 9/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/72:09 pm -
1 stop8h 21m
Sat 11/1412:18 pm -
1 stop8h 13m
Deal found 9/23![Delta logo]()
$359
This Delta deal was found by Cheapflights users on 9/20. 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 12/1612:49 pm -
2 stops14h 08m
Wed 1/67:00 am -
2 stops13h 06m
Deal found 9/20![Delta logo]()
$437
This American Airlines deal was found by Cheapflights users on 9/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:00 am -
2 stops12h 16m
Wed 10/2810:10 pm -
1 stop10h 16m
Deal found 9/19![American Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 9/20. 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.
Tue 10/273:23 pm -
1 stop8h 28m
Tue 11/35:00 am -
1 stop8h 02m
Deal found 9/20![United Airlines logo]()
$455
This American Airlines deal was found by Cheapflights users on 9/22. 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.
Sat 11/76:00 am -
2 stops13h 19m
Sat 11/146:30 am -
2 stops12h 06m
Deal found 9/22![American Airlines logo]()
$483
This United Airlines deal was found by Cheapflights users on 9/22. 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 10/313:23 pm -
1 stop8h 28m
Tue 11/35:00 am -
1 stop8h 02m
Deal found 9/22![United Airlines logo]()
$489
Best flights from Portland to OntarioDiscover carefully curated flight deals from Portland to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 24, 2026.
Discover carefully curated flight deals from Portland to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 24, 2026.
This Delta deal was found by Cheapflights users on 9/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/72:09 pm -
1 stop8h 21m
Sat 11/1412:18 pm -
1 stop8h 13m
Deal found 9/19![Delta logo]()
$359
This Delta deal was found by Cheapflights users on 9/22. 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.
Mon 1/2512:50 pm -
2 stops12h 53m
Sat 1/306:00 am -
2 stops13h 23m
Deal found 9/22![Delta logo]()
$420
Last-minute flights from Portland to OntarioDiscover last-minute flight deals from Portland to Ontario. Data last updated September 24, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Ontario. Data last updated September 24, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:00 am -
2 stops12h 16m
Wed 10/2810:10 pm -
1 stop10h 16m
Deal found 9/19![American Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 9/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/235:08 pm -
1 stop8h 41m
Fri 10/305:00 am -
1 stop8h 02m
Deal found 9/23![United Airlines logo]()
$503
This United Airlines deal was found by Cheapflights users on 9/20. 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.
Tue 10/278:32 am -
2 stops12h 29m
Tue 11/35:00 am -
1 stop8h 02m
Deal found 9/20![United Airlines logo]()
$364
This American Airlines deal was found by Cheapflights users on 9/20. 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 10/275:30 am -
2 stops12h 46m
Tue 11/36:30 am -
2 stops12h 06m
Deal found 9/20![American Airlines logo]()
$370
This United Airlines deal was found by Cheapflights users on 9/22. 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.
Wed 10/283:23 pm -
1 stop8h 28m
Sat 10/315:00 am -
2 stops10h 52m
Deal found 9/22![United Airlines logo]()
$508
This United Airlines deal was found by Cheapflights users on 9/22. 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 10/313:23 pm -
1 stop8h 28m
Tue 11/35:00 am -
1 stop8h 02m
Deal found 9/22![United Airlines logo]()
$489
One-way flights from Portland to OntarioSearch for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated September 24, 2026.
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated September 24, 2026.
This Delta deal was found by Cheapflights users on 9/20. 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.
Sun 12/1312:49 pm -
2 stops14h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Delta logo]()
$185
This Delta deal was found by Cheapflights users on 9/20. 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 12/1612:49 pm -
2 stops14h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Delta logo]()
$203
This Delta deal was found by Cheapflights users on 9/20. 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.
Thu 12/1712:49 pm -
2 stops14h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Delta logo]()
$235
This United Airlines deal was found by Cheapflights users on 9/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/303:23 pm -
1 stop8h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![United Airlines logo]()
$245
This United Airlines deal was found by Cheapflights users on 9/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/298:29 am -
2 stops14h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![United Airlines logo]()
$250
This Delta deal was found by Cheapflights users on 9/21. 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 9/306:00 am -
1 stop8h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Delta logo]()
$285
This United Airlines deal was found by Cheapflights users on 9/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/75:08 pm -
1 stop8h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![United Airlines logo]()
$296
This United Airlines deal was found by Cheapflights users on 9/20. 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 11/128:29 am -
3 stops17h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![United Airlines logo]()
$310
This United Airlines deal was found by Cheapflights users on 9/21. 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.
Tue 10/65:08 pm -
1 stop8h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![United Airlines logo]()
$325
This Delta deal was found by Cheapflights users on 9/21. 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.
Thu 10/16:00 am -
1 stop8h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Delta logo]()
$330
This CheapOair deal was found by Cheapflights users on 9/23. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:00 am -
1 stop19h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![JetBlue logo]()
$337
Find flight deals from Portland to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) 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 September 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $359 (Delta) |
One-way from | $185 (Delta) |
Popular in | April |
Cheapest in | February |
Average price | $476 |
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 7,457,451 searches. Data last updated September 24, 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
Cheapest round-trip
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Sun 12/13
12:49 pm-11:57 pm
2 stops14h 08m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$185
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Wed 11/4
8:47 am-8:15 pm
2 stops14h 28m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$250
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Wed 10/7
5:08 pm-10:49 pm
1 stop8h 41m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$296
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Tue 9/29
5:08 pm-10:49 pm
1 stop8h 41m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$350
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Sun 11/8
3:23 pm-8:51 pm
1 stop8h 28m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$350
Quickest round-trip
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Wed 9/30
3:45 pm-8:58 pm
1 stop8h 13m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$350
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Sat 11/7
2:09 pm-7:30 pm
1 stop8h 21m
Ontario
Sat 11/14
12:18 pm-11:31 pm
1 stop8h 13m
$359
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Sun 10/25
7:50 am-12:29 pm
1 stop31h 39m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$395
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Thu 10/1
5:08 pm-10:49 pm
1 stop8h 41m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$395
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Wed 10/21
5:08 pm-10:49 pm
1 stop8h 41m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$415
Showing 1-10 of 11 resultsSorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Portland, Maine-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland, Maine-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland, Maine-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Portland, Maine-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, Maine-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.
PWM-ONT
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.
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 September 24, 2026.
Read reviews from past customers who have flown Delta and American Airlines from Portland to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.8
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Entertainment
7.8
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Entertainment
7.8
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
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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Other flights from Portland
Popular flights
Alternative routes for Portland to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Portland to Ontario by cabin class
Find flights from Portland to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 24, 2026.
Portland and Ontario flights
Browse other Portland and Ontario flight options. Last updated on September 24, 2026.
Other flights from Portland
Browse through other flights departing from Portland. Flights are based on user searches made on Cheapflights and were last updated on September 24, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from Portland to Ontario
Discover the top 2 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 7,457,451 searches. Data last updated September 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$302 | Average$373 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$360 | Average$484 | FlexibilityNo cancel fee | On-time71% |