$241+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — ONT
Dec 4 — Dec 111
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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Best
Last-minute
One-way
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 November 4, 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 November 4, 2026.
This American Airlines deal was found by Cheapflights users on 11/1. 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 12/166:00 am -
2 stops15h 10m
Wed 1/69:27 am -
2 stops10h 22m
Deal found 11/1![American Airlines logo]()
$369
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/89:12 am -
2 stops14h 59m
Wed 12/95:00 am -
2 stops12h 42m
Deal found 11/3![United Airlines logo]()
$499
This Southwest deal was found by Cheapflights users on 11/2. 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.
Tue 11/175:15 am -
2 stops12h 15m
Sat 11/218:05 pm -
2 stops11h 25m
Deal found 11/2![Southwest logo]()
$530
This Delta deal was found by Cheapflights users on 10/30. 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 10/30![Delta logo]()
$535
This American Airlines deal was found by Cheapflights users on 10/30. 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 10/30![American Airlines logo]()
$545
This Delta deal was found by Cheapflights users on 10/30. 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 11/92:05 pm -
1 stop10h 52m
Sat 11/1412:18 pm -
1 stop8h 13m
Deal found 10/30![Delta logo]()
$580
This Southwest deal was found by Cheapflights users on 10/31. 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.
Tue 11/2410:25 am -
2 stops10h 25m
Mon 11/3011:55 pm -
2 stops11h 50m
Deal found 10/31![Southwest logo]()
$590
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 November 4, 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 November 4, 2026.
This Delta deal was found by Cheapflights users on 10/31. 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 1/255:30 am -
2 stops13h 57m
Sat 1/307:05 am -
2 stops11h 05m
Deal found 10/31![Delta logo]()
$370
This American Airlines deal was found by Cheapflights users on 11/4. 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.
Mon 1/2510:52 am -
2 stops15h 21m
Sat 1/306:00 am -
2 stops12h 29m
Deal found 11/4![American Airlines logo]()
$484
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/89:12 am -
2 stops14h 59m
Wed 12/95:00 am -
2 stops12h 42m
Deal found 11/3![United Airlines logo]()
$499
This Southwest deal was found by Cheapflights users on 11/2. 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.
Tue 11/175:15 am -
2 stops12h 15m
Sat 11/218:05 pm -
2 stops11h 25m
Deal found 11/2![Southwest logo]()
$530
This Delta deal was found by Cheapflights users on 10/31. 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.
Tue 3/232:35 pm -
2 stops10h 39m
Tue 3/305:47 pm -
2 stops15h 06m
Deal found 10/31![Delta logo]()
$389
This United Airlines deal was found by Cheapflights users on 10/31. 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 11/143:23 pm -
1 stop8h 28m
Tue 11/175:00 am -
1 stop8h 02m
Deal found 10/31![United Airlines logo]()
$611
This United Airlines deal was found by Cheapflights users on 10/31. 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 12/169:51 am -
1 stop11h 53m
Wed 1/65:00 am -
2 stops13h 03m
Deal found 10/31![United Airlines logo]()
$618
This United Airlines deal was found by Cheapflights users on 10/30. 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 12/109:51 am -
2 stops10h 45m
Mon 12/145:00 am -
2 stops12h 42m
Deal found 10/30![United Airlines logo]()
$655
Last-minute flights from Portland to OntarioDiscover last-minute flight deals from Portland to Ontario. Data last updated November 4, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Ontario. Data last updated November 4, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 10/30. 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 10/30![Delta logo]()
$535
This American Airlines deal was found by Cheapflights users on 10/30. 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 10/30![American Airlines logo]()
$545
This Delta deal was found by Cheapflights users on 10/30. 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 11/92:05 pm -
1 stop10h 52m
Sat 11/1412:18 pm -
1 stop8h 13m
Deal found 10/30![Delta logo]()
$580
This Southwest deal was found by Cheapflights users on 11/2. 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.
Tue 11/175:15 am -
2 stops12h 15m
Sat 11/218:05 pm -
2 stops11h 25m
Deal found 11/2![Southwest logo]()
$530
This Southwest deal was found by Cheapflights users on 10/31. 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.
Tue 11/2410:25 am -
2 stops10h 25m
Mon 11/3011:55 pm -
2 stops11h 50m
Deal found 10/31![Southwest logo]()
$590
This United Airlines deal was found by Cheapflights users on 11/3. 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 12/89:12 am -
2 stops14h 59m
Wed 12/95:00 am -
2 stops12h 42m
Deal found 11/3![United Airlines logo]()
$499
This American Airlines deal was found by Cheapflights users on 11/1. 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 12/166:00 am -
2 stops15h 10m
Wed 1/69:27 am -
2 stops10h 22m
Deal found 11/1![American Airlines logo]()
$369
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 November 4, 2026.
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated November 4, 2026.
This Delta deal was found by Cheapflights users on 11/1. 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.
Tue 11/172:05 pm -
1 stop9h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Delta logo]()
$241
This Southwest deal was found by Cheapflights users on 11/1. 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.
Tue 11/1712:45 pm -
2 stops12h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Southwest logo]()
$246
This United Airlines deal was found by Cheapflights users on 11/1. 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 11/228:47 am -
2 stops14h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![United Airlines logo]()
$260
This Kiwi.com deal was found by Cheapflights users on 11/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/175:09 pm -
3 stops26h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Multiple Airlines logo]()
$291
This Delta deal was found by Cheapflights users on 11/3. 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.
Tue 11/102:05 pm -
1 stop9h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![Delta logo]()
$295
This United Airlines deal was found by Cheapflights users on 11/2. 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 12/159:38 am -
2 stops12h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![United Airlines logo]()
$305
This United Airlines deal was found by Cheapflights users on 11/1. 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 11/153:23 pm -
1 stop8h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![United Airlines logo]()
$306
This Delta deal was found by Cheapflights users on 11/3. 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 11/132:05 pm -
1 stop10h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![Delta logo]()
$340
This United Airlines deal was found by Cheapflights users on 11/3. 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 11/1110:50 am -
2 stops13h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![United Airlines logo]()
$365
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 November 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $369 (American Airlines) |
One-way from | $241 (Delta) |
Popular in | April |
Cheapest in | February |
Average price | $497 |
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 November 4, 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 11/22
8:47 am-8:15 pm
2 stops14h 28m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$260
Quickest round-trip
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Tue 11/10
2:05 pm-8:54 pm
1 stop9h 49m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$295
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Wed 11/11
2:05 pm-8:54 pm
1 stop9h 49m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$295
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Thu 11/12
2:05 pm-9:57 pm
1 stop10h 52m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$340
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Fri 11/13
11:39 am-9:57 pm
2 stops13h 18m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$345
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Wed 11/11
10:50 am-8:51 pm
2 stops13h 01m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$365
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Mon 1/25
5:30 am-4:27 pm
2 stops13h 57m
Ontario
Sat 1/30
7:05 am-9:10 pm
2 stops11h 05m
$370
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Tue 3/23
2:35 pm-10:14 pm
2 stops10h 39m
Ontario
Tue 3/30
5:47 pm-11:53 am
2 stops15h 06m
$389
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Fri 12/25
9:48 am-10:31 pm
2 stops15h 43m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$410
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Mon 1/25
10:52 am-11:13 pm
2 stops15h 21m
Ontario
Sat 1/30
6:00 am-9:29 pm
2 stops12h 29m
$484
Showing 1-10 of 15 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 November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 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 November 4, 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
Food
7.2
Boarding
8.1
Comfort
7.8
Overall
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Entertainment
7.8
Food
7.2
Boarding
8.1
Comfort
7.8
Overall
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Entertainment
7.8
Food
7.2
Boarding
8.1
Comfort
7.8
Overall
7.8
Crew
8.5
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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Alternative routes for Portland to Ontario
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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 November 4, 2026.
Portland and Ontario flights
Browse other Portland and Ontario flight options. Last updated on November 4, 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 November 4, 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 November 4, 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% |