$202+ 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 6/11. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — ONT
May 18 — May 251
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 April 18, 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 April 18, 2026.
This JetBlue deal was found by Cheapflights users on 4/16. 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 6/92:37 pm
PWM
- ONT
1 stop9h 10m
JetBlue
Tue 6/1611:53 pm
ONT
- PWM
1 stop10h 42m
JetBlue
Deal found 4/16![JetBlue logo]()
$329
This JetBlue deal was found by Cheapflights users on 4/16. 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.
Thu 6/112:30 pm
PWM
- ONT
1 stop11h 08m
JetBlue
Tue 6/1611:53 pm
ONT
- PWM
1 stop10h 42m
JetBlue
Deal found 4/16![JetBlue logo]()
$366
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/62:40 pm
PWM
- ONT
1 stop10h 55m
JetBlue
Sun 8/911:50 pm
ONT
- PWM
1 stop9h 31m
JetBlue
Deal found 4/14![JetBlue logo]()
$429
This JetBlue deal was found by Cheapflights users on 4/17. 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.
Wed 5/272:36 pm
PWM
- ONT
1 stop9h 11m
JetBlue
Sat 5/3010:41 pm
ONT
- PWM
1 stop11h 49m
JetBlue
Deal found 4/17![JetBlue logo]()
$436
This American Airlines deal was found by Cheapflights users on 4/15. 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 6/245:36 pm
PWM
- ONT
1 stop9h 23m
American Airlines
Tue 6/307:12 pm
ONT
- PWM
2 stops12h 25m
American Airlines
Deal found 4/15![American Airlines logo]()
$445
This JetBlue deal was found by Cheapflights users on 4/16. 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 6/92:37 pm
PWM
- ONT
1 stop9h 10m
JetBlue
Sat 6/1311:16 pm
ONT
- PWM
1 stop10h 14m
JetBlue
Deal found 4/16![JetBlue logo]()
$446
This JetBlue deal was found by Cheapflights users on 4/16. 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.
Mon 6/82:37 pm
PWM
- ONT
1 stop9h 10m
JetBlue
Tue 6/1611:53 pm
ONT
- PWM
1 stop10h 42m
JetBlue
Deal found 4/16![JetBlue logo]()
$452
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:30 am
PWM
- ONT
2 stops14h 31m
Delta
Sun 8/2310:59 pm
ONT
- PWM
1 stop10h 23m
Delta
Deal found 4/14![Delta logo]()
$454
This Delta deal was found by Cheapflights users on 4/17. 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 5/92:05 pm
PWM
- ONT
1 stop10h 43m
Delta
Sat 5/1612:07 pm
ONT
- PWM
1 stop8h 02m
Delta
Deal found 4/17![Delta logo]()
$459
This JetBlue deal was found by Cheapflights users on 4/16. 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 6/92:37 pm
PWM
- ONT
1 stop9h 10m
JetBlue
Wed 6/1711:53 pm
ONT
- PWM
1 stop10h 42m
JetBlue
Deal found 4/16![JetBlue logo]()
$469
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/82:37 pm
PWM
- ONT
1 stop9h 10m
JetBlue
Thu 6/1111:53 pm
ONT
- PWM
1 stop10h 42m
JetBlue
Deal found 4/14![JetBlue logo]()
$474
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 April 18, 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 April 18, 2026.
This JetBlue deal was found by Cheapflights users on 4/17. 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.
Wed 5/272:36 pm
PWM
- ONT
1 stop9h 11m
JetBlue
Sat 5/3010:41 pm
ONT
- PWM
1 stop11h 49m
JetBlue
Deal found 4/17![JetBlue logo]()
$436
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:30 am
PWM
- ONT
2 stops14h 31m
Delta
Sun 8/2310:59 pm
ONT
- PWM
1 stop10h 23m
Delta
Deal found 4/14![Delta logo]()
$454
This United Airlines deal was found by Cheapflights users on 4/17. 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 5/275:15 am
PWM
- ONT
2 stops15h 13m
United Airlines
Sat 5/306:30 am
ONT
- PWM
2 stops14h 21m
United Airlines
Deal found 4/17![United Airlines logo]()
$488
This Southwest deal was found by Cheapflights users on 4/15. 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 5/155:30 am
PWM
- ONT
1 stop12h 45m
Southwest
Fri 5/2211:55 pm
ONT
- PWM
2 stops13h 05m
Southwest
Deal found 4/15![Southwest logo]()
$555
This JetBlue deal was found by Cheapflights users on 4/16. 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 6/92:37 pm
PWM
- ONT
1 stop9h 10m
JetBlue
Sun 6/1411:53 pm
ONT
- PWM
1 stop10h 42m
JetBlue
Deal found 4/16![JetBlue logo]()
$524
This Delta deal was found by Cheapflights users on 4/15. 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 4/306:00 am
PWM
- ONT
2 stops15h 33m
Delta
Mon 5/410:15 pm
ONT
- PWM
2 stops12h 56m
Delta
Deal found 4/15![Delta logo]()
$540
This United Airlines deal was found by Cheapflights users on 4/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/29:40 am
PWM
- ONT
1 stop11h 21m
United Airlines
Tue 5/55:00 am
ONT
- PWM
1 stop7h 41m
United Airlines
Deal found 4/14![United Airlines logo]()
$554
This JetBlue deal was found by Cheapflights users on 4/16. 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.
Thu 6/112:30 pm
PWM
- ONT
1 stop11h 08m
JetBlue
Sun 6/1411:53 pm
ONT
- PWM
1 stop10h 42m
JetBlue
Deal found 4/16![JetBlue logo]()
$561
Last-minute flights from Portland to OntarioDiscover last-minute flight deals from Portland to Ontario. Data last updated April 18, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Ontario. Data last updated April 18, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 4/15. 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 4/304:50 pm
PWM
- ONT
1 stop8h 45m
United Airlines
Mon 5/45:00 am
ONT
- PWM
1 stop7h 41m
United Airlines
Deal found 4/15![United Airlines logo]()
$529
This Delta deal was found by Cheapflights users on 4/15. 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 4/305:21 am
PWM
- ONT
1 stop9h 15m
Delta
Mon 5/410:15 pm
ONT
- PWM
2 stops12h 56m
Delta
Deal found 4/15![Delta logo]()
$534
This United Airlines deal was found by Cheapflights users on 4/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/29:40 am
PWM
- ONT
1 stop11h 21m
United Airlines
Tue 5/55:00 am
ONT
- PWM
1 stop7h 41m
United Airlines
Deal found 4/14![United Airlines logo]()
$554
This United Airlines deal was found by Cheapflights users on 4/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/54:50 pm
PWM
- ONT
1 stop8h 45m
United Airlines
Fri 5/85:00 am
ONT
- PWM
1 stop7h 41m
United Airlines
Deal found 4/14![United Airlines logo]()
$514
This Delta deal was found by Cheapflights users on 4/17. 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 5/82:05 pm
PWM
- ONT
1 stop10h 43m
Delta
Sat 5/1612:07 pm
ONT
- PWM
1 stop8h 02m
Delta
Deal found 4/17![Delta logo]()
$544
This Delta deal was found by Cheapflights users on 4/17. 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 5/92:05 pm
PWM
- ONT
1 stop10h 43m
Delta
Fri 5/1512:07 pm
ONT
- PWM
1 stop8h 02m
Delta
Deal found 4/17![Delta logo]()
$459
This Southwest deal was found by Cheapflights users on 4/15. 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 5/155:30 am
PWM
- ONT
1 stop12h 45m
Southwest
Fri 5/2211:55 pm
ONT
- PWM
2 stops13h 05m
Southwest
Deal found 4/15![Southwest logo]()
$555
This JetBlue deal was found by Cheapflights users on 4/17. 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.
Wed 5/272:36 pm
PWM
- ONT
1 stop9h 11m
JetBlue
Sat 5/3010:41 pm
ONT
- PWM
1 stop11h 49m
JetBlue
Deal found 4/17![JetBlue logo]()
$436
This United Airlines deal was found by Cheapflights users on 4/17. 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 5/279:55 am
PWM
- ONT
2 stops15h 56m
United Airlines
Sat 5/306:30 am
ONT
- PWM
1 stop8h 14m
United Airlines
Deal found 4/17![United Airlines logo]()
$483
This Priceline deal was found by Cheapflights users on 4/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/292:36 pm
PWM
- ONT
1 stop9h 11m
JetBlue
Wed 6/310:41 pm
ONT
- PWM
1 stop11h 54m
JetBlue
Deal found 4/14![JetBlue logo]()
$491
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 April 18, 2026.
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated April 18, 2026.
This JetBlue deal was found by Cheapflights users on 4/17. 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.
Thu 6/112:30 pm
PWM
- ONT
1 stop11h 08m
JetBlue
Deal found 4/17![JetBlue logo]()
$202
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:00 am
PWM
- ONT
1 stop8h 04m
Delta
Deal found 4/14![Delta logo]()
$225
This United Airlines deal was found by Cheapflights users on 4/15. 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 5/911:34 am
PWM
- ONT
1 stop9h 27m
United Airlines
Deal found 4/15![United Airlines logo]()
$235
This JetBlue deal was found by Cheapflights users on 4/17. 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.
Sat 7/42:30 pm
PWM
- ONT
1 stop10h 31m
JetBlue
Deal found 4/17![JetBlue logo]()
$242
This Southwest deal was found by Cheapflights users on 4/18. 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 7/177:40 am
PWM
- ONT
1 stop9h 10m
Southwest
Deal found 4/18![Southwest logo]()
$244
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/211:17 pm
PWM
- ONT
1 stop12h 18m
JetBlue
Deal found 4/14![JetBlue logo]()
$252
This Delta deal was found by Cheapflights users on 4/15. 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 8/146:00 am
PWM
- ONT
2 stops18h 56m
Delta
Deal found 4/15![Delta logo]()
$263
This Delta deal was found by Cheapflights users on 4/15. 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 5/55:21 am
PWM
- ONT
1 stop9h 15m
Delta
Deal found 4/15![Delta logo]()
$265
This United Airlines deal was found by Cheapflights users on 4/17. 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 7/214:58 pm
PWM
- ONT
1 stop8h 53m
United Airlines
Deal found 4/17![United Airlines logo]()
$280
This Priceline deal was found by Cheapflights users on 4/16. 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 6/262:30 pm
PWM
- ONT
1 stop11h 08m
JetBlue
Deal found 4/16![JetBlue logo]()
$282
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 April 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $329 (JetBlue) |
One-way from | $202 (JetBlue) |
Popular in | December |
Cheapest in | September |
Average price | $408 |
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 April 18, 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
Wed 5/27
2:36 pm-8:47 pm
1 stop9h 11m
Ontario
Sat 5/30
10:41 pm-1:30 pm
1 stop11h 49m
$436
PortlandOntario
PWM - ONT
PWMONT
Portland
Thu 8/20
6:30 am-6:01 pm
2 stops14h 31m
Ontario
Sun 8/23
10:59 pm-12:22 pm
1 stop10h 23m
$454
PortlandOntario
PWM - ONT
PWMONT
Portland
Wed 5/27
5:15 am-5:28 pm
2 stops15h 13m
Ontario
Sat 5/30
6:30 am-11:51 pm
2 stops14h 21m
$488
PortlandOntario
PWM - ONT
PWMONT
Portland
Tue 6/9
2:37 pm-8:47 pm
1 stop9h 10m
Ontario
Sun 6/14
11:53 pm-1:35 pm
1 stop10h 42m
$524
PortlandOntario
PWM - ONT
PWMONT
Portland
Thu 4/30
6:00 am-6:33 pm
2 stops15h 33m
Ontario
Mon 5/4
10:15 pm-2:11 pm
2 stops12h 56m
$540
Quickest round-trip
PortlandOntario
PWM - ONT
PWMONT
Portland
Sat 5/2
9:40 am-6:01 pm
1 stop11h 21m
Ontario
Tue 5/5
5:00 am-3:41 pm
1 stop7h 41m
$554
PortlandOntario
PWM - ONT
PWMONT
Portland
Fri 5/15
5:30 am-3:15 pm
1 stop12h 45m
Ontario
Fri 5/22
11:55 pm-4:00 pm
2 stops13h 05m
$555
PortlandOntario
PWM - ONT
PWMONT
Portland
Thu 6/11
2:30 pm-10:38 pm
1 stop11h 08m
Ontario
Sun 6/14
11:53 pm-1:35 pm
1 stop10h 42m
$561
Cheapest one-way
PortlandOntario
PWM - ONT
PWMONT
Portland
Sat 7/4
2:30 pm-10:01 pm
1 stop10h 31m
$242
PortlandOntario
PWM - ONT
PWMONT
Portland
Sat 10/3
4:48 pm-10:26 pm
1 stop8h 38m
$280
Showing 1-10 of 17 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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | 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 April 18, 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.
Comfort
7.9
Food
7.2
Boarding
8.1
Overall
7.9
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Comfort
7.9
Food
7.2
Boarding
8.1
Overall
7.9
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Comfort
7.9
Food
7.2
Boarding
8.1
Overall
7.9
Entertainment
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
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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 April 18, 2026.
Portland and Ontario flights
Browse other Portland and Ontario flight options. Last updated on April 18, 2026.
Other flights from Portland
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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 April 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$196 | Average$329 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$279 | Average$456 | FlexibilityNo cancel fee | On-time71% |