$165+ Cheap flights from Portland, ME to Ontario (PWM - 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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — ONT
Jun 13 — Jun 201
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
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.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 May 14, 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 May 14, 2026.
This Priceline deal was found by Cheapflights users on 5/11. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:17 pm
PWM
- ONT
1 stop12h 18m
JetBlue
Sat 9/511:24 pm
ONT
- PWM
1 stop9h 57m
JetBlue
Deal found 5/11![JetBlue logo]()
$329
This American Airlines deal was found by Cheapflights users on 5/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:00 am
PWM
- ONT
1 stop8h 31m
American Airlines
Sat 9/57:06 am
ONT
- PWM
1 stop8h 47m
American Airlines
Deal found 5/11![American Airlines logo]()
$386
This Southwest deal was found by Cheapflights users on 5/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:45 am
PWM
- ONT
2 stops11h 20m
Southwest
Sat 9/511:55 pm
ONT
- PWM
2 stops10h 20m
Southwest
Deal found 5/11![Southwest logo]()
$396
This American Airlines deal was found by Cheapflights users on 5/14. 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.
Thu 8/208:00 am
PWM
- ONT
1 stop8h 31m
American Airlines
Mon 8/3111:25 pm
ONT
- PWM
1 stop10h 15m
American Airlines
Deal found 5/14![American Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 5/13. 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.
Wed 9/305:45 am
PWM
- ONT
2 stops10h 25m
Southwest
Fri 10/28:35 am
ONT
- PWM
2 stops12h 30m
Southwest
Deal found 5/13![Southwest logo]()
$421
This Delta deal was found by Cheapflights users on 5/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/202:14 pm
PWM
- ONT
1 stop10h 38m
Delta
Sun 8/2311:56 am
ONT
- PWM
1 stop8h 24m
Delta
Deal found 5/13![Delta logo]()
$424
This Southwest deal was found by Cheapflights users on 5/9. 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 6/95:30 am
PWM
- ONT
1 stop9h 35m
Southwest
Mon 6/1511:55 pm
ONT
- PWM
2 stops9h 30m
Southwest
Deal found 5/9![Southwest logo]()
$448
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 May 14, 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 May 14, 2026.
This Delta deal was found by Cheapflights users on 5/9. 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 8/206:00 am
PWM
- ONT
2 stops15h 29m
Delta
Sun 8/2311:56 am
ONT
- PWM
1 stop8h 24m
Delta
Deal found 5/9![Delta logo]()
$429
This Southwest deal was found by Cheapflights users on 5/9. 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 6/95:30 am
PWM
- ONT
1 stop9h 35m
Southwest
Mon 6/159:40 pm
ONT
- PWM
1 stop9h 15m
Southwest
Deal found 5/9![Southwest logo]()
$429
This Delta deal was found by Cheapflights users on 5/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/282:05 pm
PWM
- ONT
1 stop10h 43m
Delta
Mon 6/110:00 pm
ONT
- PWM
2 stops11h 38m
Delta
Deal found 5/13![Delta logo]()
$494
This Southwest deal was found by Cheapflights users on 5/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/95:30 am
PWM
- ONT
1 stop9h 35m
Southwest
Thu 6/119:45 am
ONT
- PWM
2 stops11h 20m
Southwest
Deal found 5/12![Southwest logo]()
$499
Last-minute flights from Portland to OntarioDiscover last-minute flight deals from Portland to Ontario. Data last updated May 14, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Ontario. Data last updated May 14, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 5/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/282:05 pm
PWM
- ONT
1 stop10h 43m
Delta
Mon 6/110:00 pm
ONT
- PWM
2 stops11h 38m
Delta
Deal found 5/13![Delta logo]()
$494
This Southwest deal was found by Cheapflights users on 5/13. 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.
Thu 5/285:30 am
PWM
- ONT
2 stops11h 50m
Southwest
Mon 6/111:55 pm
ONT
- PWM
2 stops9h 25m
Southwest
Deal found 5/13![Southwest logo]()
$499
This Southwest deal was found by Cheapflights users on 5/9. 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 6/95:30 am
PWM
- ONT
1 stop9h 35m
Southwest
Mon 6/159:40 pm
ONT
- PWM
1 stop9h 15m
Southwest
Deal found 5/9![Southwest logo]()
$429
This Southwest deal was found by Cheapflights users on 5/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/91:05 pm
PWM
- ONT
2 stops10h 15m
Southwest
Thu 6/119:45 am
ONT
- PWM
2 stops11h 20m
Southwest
Deal found 5/12![Southwest logo]()
$504
This Southwest deal was found by Cheapflights users on 5/13. 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.
Wed 6/173:45 pm
PWM
- ONT
2 stops10h 15m
Southwest
Fri 6/199:45 am
ONT
- PWM
2 stops11h 20m
Southwest
Deal found 5/13![Southwest logo]()
$524
This Southwest deal was found by Cheapflights users on 5/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/265:20 pm
PWM
- ONT
1 stop8h 05m
Southwest
Thu 7/29:45 am
ONT
- PWM
2 stops11h 20m
Southwest
Deal found 5/11![Southwest logo]()
$565
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 May 14, 2026.
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated May 14, 2026.
This Priceline deal was found by Cheapflights users on 5/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/52:37 pm
PWM
- ONT
1 stop9h 10m
JetBlue
Deal found 5/13![JetBlue logo]()
$165
This American Airlines deal was found by Cheapflights users on 5/9. 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 6/97:16 am
PWM
- ONT
2 stops14h 05m
American Airlines
Deal found 5/9![American Airlines logo]()
$192
This Priceline deal was found by Cheapflights users on 5/11. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/152:40 pm
PWM
- ONT
1 stop10h 55m
JetBlue
Deal found 5/11![JetBlue logo]()
$202
This Southwest deal was found by Cheapflights users on 5/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/305:20 pm
PWM
- ONT
1 stop8h 05m
Southwest
Deal found 5/11![Southwest logo]()
$225
This American Airlines deal was found by Cheapflights users on 5/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/121:36 pm
PWM
- ONT
2 stops12h 03m
American Airlines
Deal found 5/11![American Airlines logo]()
$230
This American Airlines deal was found by Cheapflights users on 5/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/181:36 pm
PWM
- ONT
2 stops13h 23m
American Airlines
Deal found 5/10![American Airlines logo]()
$238
This American Airlines deal was found by Cheapflights users on 5/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/301:25 pm
PWM
- ONT
2 stops12h 07m
American Airlines
Deal found 5/11![American Airlines logo]()
$242
This Southwest deal was found by Cheapflights users on 5/9. 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 6/193:10 pm
PWM
- ONT
2 stops11h 20m
Southwest
Deal found 5/9![Southwest logo]()
$249
This United Airlines deal was found by Cheapflights users on 5/12. 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.
Sat 10/313:35 pm
PWM
- ONT
1 stop7h 45m
United Airlines
Deal found 5/12![United Airlines logo]()
$255
This JetBlue deal was found by Cheapflights users on 5/12. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/141:17 pm
PWM
- ONT
1 stop12h 18m
JetBlue
Deal found 5/12![JetBlue logo]()
$256
This United Airlines deal was found by Cheapflights users on 5/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:49 am
PWM
- ONT
2 stops13h 12m
United Airlines
Deal found 5/10![United Airlines logo]()
$260
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 May 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $329 (Priceline) |
One-way from | $165 (JetBlue) |
Popular in | June |
Cheapest in | September |
Average price | $462 |
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 14, 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 - ONT
PWMONT
Portland
Thu 8/20
6:00 am-6:29 pm
2 stops15h 29m
Ontario
Sun 8/23
11:56 am-11:20 pm
1 stop8h 24m
$429
Quickest round-trip
PortlandOntario
PWM - ONT
PWMONT
Portland
Tue 6/9
5:30 am-12:05 pm
1 stop9h 35m
Ontario
Mon 6/15
9:40 pm-9:55 am
1 stop9h 15m
$429
PortlandOntario
PWM - ONT
PWMONT
Portland
Thu 5/28
2:05 pm-9:48 pm
1 stop10h 43m
Ontario
Mon 6/1
10:00 pm-12:38 pm
2 stops11h 38m
$494
PortlandOntario
PWM - ONT
PWMONT
Portland
Tue 6/9
5:30 am-12:05 pm
1 stop9h 35m
Ontario
Thu 6/11
9:45 am-12:05 am
2 stops11h 20m
$499
Cheapest one-way
PortlandOntario
PWM - ONT
PWMONT
Portland
Wed 9/2
2:40 pm-10:35 pm
1 stop10h 55m
$165
PortlandOntario
PWM - ONT
PWMONT
Portland
Tue 6/9
2:37 pm-8:47 pm
1 stop9h 10m
$165
PortlandOntario
PWM - ONT
PWMONT
Portland
Wed 9/2
2:35 pm-11:44 pm
2 stops12h 09m
$192
Quickest one-way
PortlandOntario
PWM - ONT
PWMONT
Portland
Thu 7/30
5:20 pm-10:25 pm
1 stop8h 05m
$225
PortlandOntario
PWM - ONT
PWMONT
Portland
Fri 6/12
5:00 pm-10:51 pm
1 stop8h 51m
$225
PortlandOntario
PWM - ONT
PWMONT
Portland
Thu 8/27
9:49 am-8:01 pm
2 stops13h 12m
$260
Showing 1-10 of 16 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 May.
| 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 May 14, 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.
Boarding
8.1
Overall
7.9
Crew
8.5
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Boarding
8.1
Overall
7.9
Crew
8.5
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Boarding
8.1
Overall
7.9
Crew
8.5
Comfort
7.8
Food
7.2
Entertainment
7.8
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 May 14, 2026.
Portland and Ontario flights
Browse other Portland and Ontario flight options. Last updated on May 14, 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 May 14, 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 2,558,603 searches. Data last updated May 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$196 | Average$322 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$279 | Average$456 | FlexibilityNo cancel fee | On-time71% |