$93+ Cheap flights from Portland to Ontario (PDX - 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Oct 4 — Oct 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
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.Cheapflights Tip: The best prices from Portland to Ontario are usually found in October or January, booked 47 days in advance, depart on a Friday or Sunday and return on a Friday
Cheap flight deals from Portland to Ontario
Cheapest
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 September 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 September 4, 2026.
This FlightHub deal was found by Cheapflights users on 8/31. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1712:24 pm -
1 stop4h 35m
Fri 9/252:30 pm -
1 stop21h 06m
Deal found 8/31![Frontier logo]()
$250
This CheapOair deal was found by Cheapflights users on 9/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2112:39 pm -
1 stop20h 30m
Thu 9/242:30 pm -
1 stop21h 24m
Deal found 9/1![Frontier logo]()
$251
This Frontier deal was found by Cheapflights users on 9/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:02 pm -
1 stop11h 49m
Fri 11/208:02 am -
1 stop5h 01m
Deal found 9/3![Frontier logo]()
$253
This CheapOair deal was found by Cheapflights users on 9/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:24 pm -
1 stop22h 58m
Thu 10/81:38 pm -
1 stop22h 02m
Deal found 9/1![Frontier logo]()
$254
This Justfly.com deal was found by Cheapflights users on 9/3. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2112:39 pm -
1 stop20h 30m
Wed 9/2311:45 am -
1 stop23h 58m
Deal found 9/3![Frontier logo]()
$256
This Booking.com deal was found by Cheapflights users on 9/2. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/68:28 am -
Nonstop2h 21m
Sat 10/107:25 am -
Nonstop2h 20m
Deal found 9/2![Alaska Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 9/3. 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.
Wed 10/75:30 pm -
1 stop3h 50m
Wed 10/146:40 am -
1 stop3h 30m
Deal found 9/3![Southwest logo]()
$258
This Frontier deal was found by Cheapflights users on 8/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:38 pm -
1 stop11h 09m
Sun 9/278:24 pm -
1 stop15h 30m
Deal found 8/31![Frontier logo]()
$259
This Frontier deal was found by Cheapflights users on 8/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1512:07 pm -
1 stop11h 44m
Thu 12/1010:05 am -
1 stop6h 43m
Deal found 8/30![Frontier logo]()
$260
This CheapOair deal was found by Cheapflights users on 9/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1912:02 pm -
1 stop11h 49m
Mon 11/2310:33 pm -
1 stop20h 51m
Deal found 9/2![Frontier logo]()
$261
This Frontier deal was found by Cheapflights users on 9/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/812:11 pm -
1 stop18h 53m
Sun 10/118:35 pm -
1 stop15h 05m
Deal found 9/4![Frontier logo]()
$262
This CheapOair deal was found by Cheapflights users on 9/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1112:11 pm -
1 stop23h 05m
Thu 10/151:38 pm -
1 stop22h 02m
Deal found 9/1![Frontier logo]()
$263
Best flights from Portland to OntarioDiscover carefully curated flight deals from Portland to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 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 September 4, 2026.
This Delta deal was found by Cheapflights users on 8/30. 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.
Wed 11/115:45 am -
1 stop6h 32m
Sat 12/127:00 am -
1 stop6h 35m
Deal found 8/30![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 8/31. 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 10/135:30 pm -
1 stop3h 50m
Tue 10/208:25 am -
2 stops6h 30m
Deal found 8/31![Southwest logo]()
$288
This United Airlines deal was found by Cheapflights users on 8/31. 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 11/113:40 pm -
1 stop4h 35m
Fri 11/139:25 am -
1 stop5h 12m
Deal found 8/31![United Airlines logo]()
$358
This Alaska Airlines deal was found by Cheapflights users on 9/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/242:53 pm -
Nonstop2h 25m
Mon 9/287:12 am -
Nonstop2h 18m
Deal found 9/3![Alaska Airlines logo]()
$367
This Delta deal was found by Cheapflights users on 8/30. 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.
Wed 11/1111:32 am -
1 stop5h 47m
Sun 12/137:00 am -
1 stop6h 35m
Deal found 8/30![Delta logo]()
$278
This Southwest deal was found by Cheapflights users on 8/31. 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 9/295:50 am -
2 stops7h 20m
Sat 10/33:10 pm -
2 stops5h 30m
Deal found 8/31![Southwest logo]()
$289
This Delta deal was found by Cheapflights users on 8/30. 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.
Thu 9/177:15 pm -
1 stop4h 32m
Sun 9/206:00 am -
1 stop4h 40m
Deal found 8/30![Delta logo]()
$293
This Southwest deal was found by Cheapflights users on 9/1. 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 9/225:50 am -
2 stops7h 20m
Thu 9/245:45 pm -
1 stop5h 25m
Deal found 9/1![Southwest logo]()
$294
This Alaska Airlines deal was found by Cheapflights users on 9/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/252:53 pm -
Nonstop2h 25m
Mon 9/287:12 am -
Nonstop2h 18m
Deal found 9/1![Alaska Airlines logo]()
$367
This Delta deal was found by Cheapflights users on 9/3. 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.
Sat 9/199:51 am -
1 stop7h 28m
Tue 9/296:00 am -
1 stop4h 40m
Deal found 9/3![Delta logo]()
$313
This Alaska Airlines deal was found by Cheapflights users on 9/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:22 am -
Nonstop2h 22m
Sun 11/1510:40 am -
Nonstop2h 20m
Deal found 9/3![Alaska Airlines logo]()
$367
Last-minute flights from Portland to OntarioDiscover last-minute flight deals from Portland to Ontario. Data last updated September 4, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Ontario. Data last updated September 4, 2026 and is based on user searches.
This FlightHub deal was found by Cheapflights users on 8/31. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1712:24 pm -
1 stop4h 35m
Fri 9/252:30 pm -
1 stop21h 06m
Deal found 8/31![Frontier logo]()
$250
This Booking.com deal was found by Cheapflights users on 9/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1712:24 pm -
1 stop4h 35m
Sun 9/2011:45 am -
1 stop23h 58m
Deal found 9/3![Frontier logo]()
$266
This CheapOair deal was found by Cheapflights users on 9/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2112:39 pm -
1 stop20h 30m
Thu 9/242:30 pm -
1 stop21h 24m
Deal found 9/1![Frontier logo]()
$251
This Justfly.com deal was found by Cheapflights users on 9/3. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2112:39 pm -
1 stop20h 30m
Wed 9/2311:45 am -
1 stop23h 58m
Deal found 9/3![Frontier logo]()
$256
This Frontier deal was found by Cheapflights users on 8/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:38 pm -
1 stop11h 09m
Sun 9/278:24 pm -
1 stop15h 30m
Deal found 8/31![Frontier logo]()
$259
This FlightHub deal was found by Cheapflights users on 9/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:24 pm -
1 stop4h 25m
Thu 10/81:38 pm -
1 stop22h 02m
Deal found 9/1![Frontier logo]()
$253
This Booking.com deal was found by Cheapflights users on 9/2. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/68:28 am -
Nonstop2h 21m
Sat 10/107:25 am -
Nonstop2h 20m
Deal found 9/2![Alaska Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 9/2. 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.
Wed 10/75:30 pm -
1 stop3h 50m
Wed 10/146:40 am -
1 stop3h 30m
Deal found 9/2![Southwest logo]()
$258
This Booking.com deal was found by Cheapflights users on 9/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/105:48 pm -
Nonstop2h 27m
Sat 11/710:40 am -
Nonstop2h 20m
Deal found 9/1![Alaska Airlines logo]()
$264
This CheapOair deal was found by Cheapflights users on 9/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1112:11 pm -
1 stop23h 05m
Thu 10/151:38 pm -
1 stop22h 02m
Deal found 9/1![Frontier logo]()
$263
This Justfly.com deal was found by Cheapflights users on 9/2. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2312:25 pm -
1 stop4h 05m
Sun 10/258:35 pm -
1 stop15h 05m
Deal found 9/2![Frontier logo]()
$262
One-way flights from Portland to OntarioSearch for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated September 4, 2026.
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated September 4, 2026.
This WAYA deal was found by Cheapflights users on 9/2. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/152:53 pm -
1 stop4h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Multiple Airlines logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 9/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:11 pm -
2 stops31h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 9/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2110:27 am -
1 stop14h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$99
This Frontier deal was found by Cheapflights users on 8/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2112:39 pm -
1 stop4h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/30![Frontier logo]()
$111
This Super.com deal was found by Cheapflights users on 9/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2512:38 pm -
1 stop11h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$115
This Super.com deal was found by Cheapflights users on 9/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:02 pm -
1 stop22h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$116
This Frontier deal was found by Cheapflights users on 9/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:38 pm -
1 stop11h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Frontier logo]()
$117
This CheapOair deal was found by Cheapflights users on 9/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2712:24 pm -
1 stop18h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$118
This Super.com deal was found by Cheapflights users on 9/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:24 pm -
1 stop4h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$121
This Frontier deal was found by Cheapflights users on 9/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/34:35 pm -
1 stop7h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$122
Find flight deals from Portland to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $250 (FlightHub) |
One-way from | $93 (WAYA) |
Popular in | July |
Cheapest in | October |
Average price | $297 |
Good round-trip deal | $317 or less |
Good one-way deal | $193 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Portland to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 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
PDX Portland - ONT Ontario
PDXONT
Portland
Wed 10/28
12:29 pm-5:12 pm
1 stop4h 43m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$134
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Sat 11/14
9:58 am-4:24 pm
1 stop6h 26m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$134
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Wed 10/21
5:49 pm-10:43 pm
1 stop4h 54m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$134
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Sat 10/3
6:09 am-1:16 pm
1 stop7h 07m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$139
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Wed 11/25
5:30 am-11:17 am
1 stop5h 47m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$145
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Sat 9/26
5:40 am-12:14 pm
1 stop6h 34m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$145
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Fri 10/2
5:10 pm-11:47 pm
1 stop6h 37m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$155
Quickest round-trip
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Tue 10/6
1:03 pm-5:41 pm
1 stop4h 38m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$174
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Sun 11/29
5:30 am-11:17 am
1 stop5h 47m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$175
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Tue 9/22
5:00 am-12:50 pm
1 stop7h 50m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$189
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Portland to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Ontario in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Portland-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Portland-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-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.
PDX-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.
Cheapflights Insights
Everything you need to know about your flight from Portland to Ontario
How far ahead should I book a flight from Portland to Ontario?
The price you pay for your flight from Portland to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 46 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Portland to Ontario?
Currently, October is the cheapest month in which you can book a flight from Portland to Ontario (average of $186). Flying from Portland to Ontario in July is currently the most expensive (average of $357). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from PDX to ONT?
Find hourly flight availability from Portland to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 4, 2026.
When flying from Portland to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 31% versus a flight in the morning.
What is the cheapest day to fly from Portland to Ontario?
Use this chart to determine the cheapest time to fly round-trip from Portland to Ontario. Price data was last updated on August 29, 2026.
Travelers seeking maximum savings on their Portland to Ontario flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for Portland to Ontario flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Portland to Ontario trip
Our travel experts
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated September 4, 2026.
Read through reviews of airlines operating flights from Portland to Ontario, such as Southwest,Alaska Airlines, andHawaiian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
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
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Portland to Ontario by cabin class
Find flights from Portland to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 4, 2026.
Portland and Ontario flights
Browse other Portland and Ontario flight options. Last updated on September 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 September 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 6 airlines flying from Portland to Ontario
Discover the top 6 airlines that operate flights from Portland to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$48 | Average$159 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$83 | Average$258 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$138 | Average$277 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$142 | Average$352 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$157 | Average$308 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$167 | Average$305 | FlexibilityNo cancel fee | On-time63% |