$180+ 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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — ONT
Sep 7 — Sep 141
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 August 8, 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 August 8, 2026.
This American Airlines deal was found by Cheapflights users on 8/7. 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 -
1 stop8h 31m
Tue 9/226:00 am -
2 stops14h 47m
Deal found 8/7![American Airlines logo]()
$364
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:14 pm -
1 stop8h 39m
Tue 9/112:00 pm -
1 stop8h 13m
Deal found 8/4![Delta logo]()
$367
This United Airlines deal was found by Cheapflights users on 8/3. 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.
Sat 9/55:03 pm -
1 stop8h 32m
Wed 9/95:00 am -
2 stops13h 44m
Deal found 8/3![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 8/7. 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 12/1612:50 pm -
2 stops14h 08m
Wed 1/66:00 am -
2 stops13h 23m
Deal found 8/7![Delta logo]()
$370
This American Airlines deal was found by Cheapflights users on 8/4. 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.
Wed 9/97:30 am -
2 stops13h 47m
Sun 9/136:00 am -
1 stop9h 46m
Deal found 8/4![American Airlines logo]()
$372
This Southwest deal was found by Cheapflights users on 8/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/65:20 am -
2 stops11h 45m
Tue 11/106:50 am -
2 stops11h 55m
Deal found 8/3![Southwest logo]()
$377
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:14 pm -
1 stop8h 39m
Mon 8/3112:00 pm -
1 stop8h 13m
Deal found 8/4![Delta logo]()
$379
This JetBlue deal was found by Cheapflights users on 8/4. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/292:40 pm -
1 stop10h 19m
Mon 8/3111:59 pm -
1 stop9h 31m
Deal found 8/4![JetBlue logo]()
$396
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:14 pm -
1 stop10h 38m
Wed 9/212:00 pm -
1 stop8h 13m
Deal found 8/4![Delta logo]()
$404
This Delta deal was found by Cheapflights users on 8/6. 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 9/296:00 am -
1 stop8h 05m
Fri 10/2312:18 pm -
1 stop8h 17m
Deal found 8/6![Delta logo]()
$406
This Delta deal was found by Cheapflights users on 8/3. 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 11/612:42 pm -
2 stops12h 29m
Tue 11/1012:22 pm -
1 stop8h 11m
Deal found 8/3![Delta logo]()
$409
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 August 8, 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 August 8, 2026.
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/282:14 pm -
1 stop10h 38m
Tue 9/112:00 pm -
1 stop8h 13m
Deal found 8/4![Delta logo]()
$367
This American Airlines deal was found by Cheapflights users on 8/7. 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 9/18:08 am -
2 stops13h 07m
Tue 9/226:00 am -
2 stops14h 47m
Deal found 8/7![American Airlines logo]()
$370
This United Airlines deal was found by Cheapflights users on 8/7. 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 9/13:37 pm -
1 stop8h 16m
Tue 9/225:00 am -
1 stop7h 51m
Deal found 8/7![United Airlines logo]()
$437
This Delta deal was found by Cheapflights users on 8/6. 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 9/156:00 am -
1 stop8h 05m
Tue 9/2212:17 pm -
1 stop8h 11m
Deal found 8/6![Delta logo]()
$449
This United Airlines deal was found by Cheapflights users on 8/3. 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.
Fri 9/45:03 pm -
1 stop8h 32m
Mon 9/75:00 am -
1 stop7h 51m
Deal found 8/3![United Airlines logo]()
$461
This Delta deal was found by Cheapflights users on 8/5. 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 8/262:14 pm -
1 stop8h 39m
Wed 9/212:00 pm -
1 stop8h 13m
Deal found 8/5![Delta logo]()
$453
This United Airlines deal was found by Cheapflights users on 8/7. 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 11/103:23 pm -
1 stop8h 28m
Sat 11/145:00 am -
1 stop8h 02m
Deal found 8/7![United Airlines logo]()
$477
This United Airlines deal was found by Cheapflights users on 8/6. 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 9/94:57 pm -
1 stop9h 02m
Sat 9/126:08 am -
1 stop8h 23m
Deal found 8/6![United Airlines logo]()
$477
This United Airlines deal was found by Cheapflights users on 8/5. 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 8/275:03 pm -
1 stop8h 32m
Sun 8/307:00 am -
1 stop7h 42m
Deal found 8/5![United Airlines logo]()
$477
This United Airlines deal was found by Cheapflights users on 8/7. 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 8/287:40 am -
2 stops15h 21m
Sun 8/307:00 am -
1 stop7h 42m
Deal found 8/7![United Airlines logo]()
$482
This United Airlines deal was found by Cheapflights users on 8/3. 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 1/206:00 am -
2 stops15h 44m
Sat 1/236:00 am -
2 stops13h 57m
Deal found 8/3![United Airlines logo]()
$487
Last-minute flights from Portland to OntarioDiscover last-minute flight deals from Portland to Ontario. Data last updated August 8, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Ontario. Data last updated August 8, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:14 pm -
1 stop10h 38m
Wed 9/212:00 pm -
1 stop8h 13m
Deal found 8/4![Delta logo]()
$404
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:14 pm -
1 stop10h 38m
Mon 8/3112:00 pm -
1 stop8h 13m
Deal found 8/4![Delta logo]()
$416
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:14 pm -
1 stop8h 39m
Tue 9/112:00 pm -
1 stop8h 13m
Deal found 8/4![Delta logo]()
$367
This Delta deal was found by Cheapflights users on 8/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:14 pm -
1 stop8h 39m
Mon 8/3112:00 pm -
1 stop8h 13m
Deal found 8/4![Delta logo]()
$379
This JetBlue deal was found by Cheapflights users on 8/4. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/292:40 pm -
1 stop10h 19m
Mon 8/3111:59 pm -
1 stop9h 31m
Deal found 8/4![JetBlue logo]()
$396
This American Airlines deal was found by Cheapflights users on 8/7. 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 -
1 stop8h 31m
Tue 9/226:00 am -
2 stops14h 47m
Deal found 8/7![American Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 8/3. 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.
Sat 9/55:03 pm -
1 stop8h 32m
Wed 9/95:00 am -
2 stops13h 44m
Deal found 8/3![United Airlines logo]()
$369
This American Airlines deal was found by Cheapflights users on 8/4. 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.
Wed 9/97:30 am -
2 stops13h 47m
Sun 9/136:00 am -
1 stop9h 46m
Deal found 8/4![American Airlines logo]()
$372
This Southwest deal was found by Cheapflights users on 8/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:45 am -
2 stops10h 25m
Tue 9/229:40 am -
2 stops9h 30m
Deal found 8/4![Southwest logo]()
$415
This American Airlines deal was found by Cheapflights users on 8/6. 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 9/237:32 am -
2 stops13h 45m
Sun 9/277:11 pm -
2 stops14h 54m
Deal found 8/6![American Airlines logo]()
$378
This Delta deal was found by Cheapflights users on 8/6. 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 9/296:00 am -
1 stop8h 05m
Fri 10/2312:18 pm -
1 stop8h 17m
Deal found 8/6![Delta logo]()
$406
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 August 8, 2026.
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated August 8, 2026.
This Priceline deal was found by Cheapflights users on 8/3. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/52:40 pm -
1 stop10h 19m
Deal found 8/3![JetBlue logo]()
$180
This United Airlines deal was found by Cheapflights users on 8/7. 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
Deal found 8/7![United Airlines logo]()
$184
This American Airlines deal was found by Cheapflights users on 8/5. 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 10/214:19 pm -
2 stops10h 33m
Deal found 8/5![American Airlines logo]()
$189
This Delta deal was found by Cheapflights users on 8/7. 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 9/226:00 am -
1 stop8h 05m
Deal found 8/7![Delta logo]()
$210
This American Airlines deal was found by Cheapflights users on 8/6. 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 8/278:00 am -
1 stop8h 31m
Deal found 8/6![American Airlines logo]()
$235
This United Airlines deal was found by Cheapflights users on 8/6. 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 9/245:08 pm -
1 stop8h 41m
Deal found 8/6![United Airlines logo]()
$239
This United Airlines deal was found by Cheapflights users on 8/3. 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.
Sat 9/510:45 am -
2 stops14h 50m
Deal found 8/3![United Airlines logo]()
$241
This United Airlines deal was found by Cheapflights users on 8/8. 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.
Mon 8/316:03 am -
2 stops15h 08m
Deal found 8/8![United Airlines logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 8/7. 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.
Wed 10/75:09 pm -
3 stops24h 38m
Deal found 8/7![Multiple Airlines logo]()
$248
This Kiwi.com deal was found by Cheapflights users on 8/5. 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.
Wed 10/215:09 pm -
3 stops33h 46m
Deal found 8/5![Multiple Airlines logo]()
$255
This Southwest deal was found by Cheapflights users on 8/7. 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 10/86:30 am -
1 stop10h 40m
Deal found 8/7![Southwest logo]()
$259
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 August 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $364 (American Airlines) |
One-way from | $180 (Priceline) |
Popular in | July |
Cheapest in | January |
Average price | $484 |
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 August 8, 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
Fri 8/28
2:14 pm-9:52 pm
1 stop10h 38m
Ontario
Tue 9/1
12:00 pm-11:13 pm
1 stop8h 13m
$367
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Tue 9/1
8:08 am-6:15 pm
2 stops13h 07m
Ontario
Tue 9/22
6:00 am-11:47 pm
2 stops14h 47m
$370
Quickest round-trip
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Tue 9/1
3:37 pm-8:53 pm
1 stop8h 16m
Ontario
Tue 9/22
5:00 am-3:51 pm
1 stop7h 51m
$437
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Tue 9/15
6:00 am-11:05 am
1 stop8h 05m
Ontario
Tue 9/22
12:17 pm-11:28 pm
1 stop8h 11m
$449
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Wed 8/26
2:14 pm-7:53 pm
1 stop8h 39m
Ontario
Wed 9/2
12:00 pm-11:13 pm
1 stop8h 13m
$453
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Fri 9/4
5:03 pm-10:35 pm
1 stop8h 32m
Ontario
Mon 9/7
5:00 am-3:51 pm
1 stop7h 51m
$461
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Tue 11/10
3:23 pm-8:51 pm
1 stop8h 28m
Ontario
Sat 11/14
5:00 am-4:02 pm
1 stop8h 02m
$477
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Wed 9/9
4:57 pm-10:59 pm
1 stop9h 02m
Ontario
Sat 9/12
6:08 am-5:31 pm
1 stop8h 23m
$477
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Thu 8/27
5:03 pm-10:35 pm
1 stop8h 32m
Ontario
Sun 8/30
7:00 am-5:42 pm
1 stop7h 42m
$477
PortlandOntario
PWM Portland - ONT Ontario
PWMONT
Portland
Fri 8/28
7:40 am-8:01 pm
2 stops15h 21m
Ontario
Sun 8/30
7:00 am-5:42 pm
1 stop7h 42m
$482
Showing 1-10 of 23 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 August.
| 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 August 8, 2026.
Read reviews from past customers who have flown Delta 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.
Overall
7.8
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Crew
8.5
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Overall
7.8
Entertainment
7.8
Comfort
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 to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 8, 2026.
Portland and Ontario flights
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Other flights from Portland
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Popular flight searches
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Top airline flying from Portland to Ontario
Discover the top airline 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 August 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$196 | Average$363 | FlexibilityNo cancel fee | On-timeN/A |