$85+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Nov 18 — Nov 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.Cheapflights Tip: The best prices from Portland to Ontario are usually found in January or February, booked 83 days in advance, depart on a Monday or Sunday and return on a Wednesday
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 October 19, 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 October 19, 2026.
This FlightHub deal was found by Cheapflights users on 10/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:31 pm -
1 stop22h 45m
Sat 11/1411:52 am -
1 stop23h 20m
Deal found 10/17![Frontier logo]()
$253
This FlightHub deal was found by Cheapflights users on 10/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/217:03 pm -
1 stop12h 58m
Tue 1/56:09 am -
1 stop9h 33m
Deal found 10/17![Frontier logo]()
$254
This Kiwi.com deal was found by Cheapflights users on 10/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2611:23 am -
1 stop8h 13m
Wed 12/27:06 pm -
2 stops17h 47m
Deal found 10/16![Frontier logo]()
$255
This Cheapflightsfares deal was found by Cheapflights users on 10/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:02 pm -
1 stop11h 49m
Mon 11/96:30 am -
1 stop28h 37m
Deal found 10/16![Frontier logo]()
$256
This Cheapflightsfares deal was found by Cheapflights users on 10/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/221:04 pm -
1 stop11h 09m
Mon 12/289:37 pm -
1 stop23h 56m
Deal found 10/16![Frontier logo]()
$257
This Cheapflightsfares deal was found by Cheapflights users on 10/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2110:27 am -
1 stop13h 57m
Sun 11/2211:40 am -
1 stop8h 16m
Deal found 10/18![Frontier logo]()
$258
This Frontier deal was found by Cheapflights users on 10/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2412:52 pm -
Nonstop2h 26m
Tue 11/2410:40 pm -
1 stop10h 52m
Deal found 10/18![Frontier logo]()
$259
This Frontier deal was found by Cheapflights users on 10/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:02 pm -
1 stop11h 49m
Sun 11/226:45 am -
1 stop13h 11m
Deal found 10/16![Frontier logo]()
$260
This Delta deal was found by Cheapflights users on 10/14. 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.
Sun 11/85:49 pm -
1 stop4h 54m
Mon 11/95:04 pm -
1 stop6h 47m
Deal found 10/14![Delta logo]()
$262
This FlightHub deal was found by Cheapflights users on 10/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1512:07 pm -
1 stop11h 44m
Mon 11/166:30 am -
1 stop28h 37m
Deal found 10/18![Frontier logo]()
$263
This Mytrip deal was found by Cheapflights users on 10/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:02 pm -
1 stop22h 40m
Sun 11/156:00 am -
1 stop5h 22m
Deal found 10/15![Multiple Airlines logo]()
$264
This Mytrip deal was found by Cheapflights users on 10/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/212:31 pm -
1 stop21h 09m
Thu 11/512:01 pm -
2 stops23h 35m
Deal found 10/14![Frontier logo]()
$265
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 October 19, 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 October 19, 2026.
This Southwest deal was found by Cheapflights users on 10/18. 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.
Sat 11/75:55 am -
1 stop6h 55m
Mon 11/95:20 pm -
1 stop6h 55m
Deal found 10/18![Southwest logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 10/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/192:55 pm -
Nonstop2h 20m
Mon 2/226:10 pm -
Nonstop2h 17m
Deal found 10/14![Alaska Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 10/17. 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 11/79:55 am -
1 stop6h 28m
Mon 11/95:04 pm -
1 stop6h 47m
Deal found 10/17![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 10/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/205:05 pm -
1 stop3h 40m
Mon 1/257:40 am -
1 stop6h 30m
Deal found 10/17![Southwest logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 10/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/77:45 am -
Nonstop2h 16m
Sat 12/126:17 pm -
Nonstop2h 35m
Deal found 10/15![Alaska Airlines logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 10/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/215:25 am -
1 stop5h 13m
Fri 1/297:10 am -
Nonstop2h 25m
Deal found 10/16![Alaska Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 10/18. 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.
Wed 11/410:15 am -
2 stops9h 35m
Tue 11/103:20 pm -
2 stops6h 10m
Deal found 10/18![Southwest logo]()
$338
This Southwest deal was found by Cheapflights users on 10/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/306:00 am -
1 stop6h 00m
Tue 11/35:45 am -
1 stop4h 55m
Deal found 10/17![Southwest logo]()
$387
This Southwest deal was found by Cheapflights users on 10/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/294:20 pm -
1 stop5h 05m
Tue 11/33:30 pm -
1 stop5h 55m
Deal found 10/17![Southwest logo]()
$387
This Southwest deal was found by Cheapflights users on 10/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1810:15 am -
2 stops7h 25m
Sat 11/2112:50 pm -
2 stops8h 40m
Deal found 10/17![Southwest logo]()
$407
Last-minute flights from Portland to OntarioDiscover last-minute flight deals from Portland to Ontario. Data last updated October 19, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Ontario. Data last updated October 19, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 10/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:02 pm -
1 stop11h 49m
Mon 11/96:30 am -
1 stop28h 37m
Deal found 10/16![Frontier logo]()
$256
This Delta deal was found by Cheapflights users on 10/14. 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.
Sun 11/85:49 pm -
1 stop4h 54m
Mon 11/95:04 pm -
1 stop6h 47m
Deal found 10/14![Delta logo]()
$262
This Frontier deal was found by Cheapflights users on 10/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:02 pm -
1 stop11h 49m
Sun 11/226:45 am -
1 stop13h 11m
Deal found 10/16![Frontier logo]()
$260
This FlightHub deal was found by Cheapflights users on 10/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:31 pm -
1 stop22h 45m
Sat 11/1411:52 am -
1 stop23h 20m
Deal found 10/17![Frontier logo]()
$253
This Mytrip deal was found by Cheapflights users on 10/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:02 pm -
1 stop22h 40m
Sun 11/156:00 am -
1 stop5h 22m
Deal found 10/15![Multiple Airlines logo]()
$264
This FlightHub deal was found by Cheapflights users on 10/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1512:07 pm -
1 stop11h 44m
Mon 11/166:30 am -
1 stop28h 37m
Deal found 10/18![Frontier logo]()
$263
This Alaska Airlines deal was found by Cheapflights users on 10/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/177:30 am -
Nonstop2h 22m
Sat 11/216:07 pm -
Nonstop2h 23m
Deal found 10/16![Alaska Airlines logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 10/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:08 am -
1 stop8h 05m
Sat 11/216:07 pm -
Nonstop2h 23m
Deal found 10/18![Alaska Airlines logo]()
$267
This Cheapflightsfares deal was found by Cheapflights users on 10/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2110:27 am -
1 stop13h 57m
Sun 11/2211:40 am -
1 stop8h 16m
Deal found 10/18![Frontier logo]()
$258
This Frontier deal was found by Cheapflights users on 10/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2412:52 pm -
Nonstop2h 26m
Tue 11/2410:40 pm -
1 stop10h 52m
Deal found 10/18![Frontier logo]()
$259
This Kiwi.com deal was found by Cheapflights users on 10/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2611:23 am -
1 stop8h 13m
Wed 12/27:06 pm -
2 stops17h 47m
Deal found 10/16![Frontier logo]()
$255
This Priceline deal was found by Cheapflights users on 10/19. 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.
Mon 11/301:31 pm -
1 stop6h 05m
Wed 12/26:00 am -
1 stop5h 24m
Deal found 10/19![Multiple Airlines logo]()
$265
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 October 19, 2026.
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated October 19, 2026.
This Super.com deal was found by Cheapflights users on 10/15. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1712:02 pm -
1 stop11h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 10/14. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:02 pm -
1 stop22h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![Frontier logo]()
$86
This Delta deal was found by Cheapflights users on 10/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/275:33 am -
1 stop7h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Delta logo]()
$88
This WAYA deal was found by Cheapflights users on 10/14. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/142:41 pm -
1 stop8h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![Multiple Airlines logo]()
$91
This WAYA deal was found by Cheapflights users on 10/15. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/92:50 pm -
1 stop4h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![Multiple Airlines logo]()
$93
This Delta deal was found by Cheapflights users on 10/14. 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 11/145:51 pm -
1 stop5h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![Delta logo]()
$98
This Trip.com deal was found by Cheapflights users on 10/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/105:10 pm -
1 stop7h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![Frontier logo]()
$101
This Southwest deal was found by Cheapflights users on 10/15. 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.
Thu 10/295:30 am -
2 stops8h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![Southwest logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 10/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2212:52 pm -
Nonstop2h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![Frontier logo]()
$104
This Southwest deal was found by Cheapflights users on 10/18. 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.
Mon 11/167:30 am -
1 stop5h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/18![Southwest logo]()
$109
This Frontier deal was found by Cheapflights users on 10/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/174:35 pm -
1 stop7h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![Frontier logo]()
$110
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 October 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $253 (FlightHub) |
One-way from | $85 (Super.com) |
Popular in | October |
Cheapest in | January |
Average price | $367 |
Good round-trip deal | $367 or less |
Good one-way deal | $253 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 October 19, 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
Sat 10/31
6:30 am-1:00 pm
2 stops6h 30m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$103
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Fri 12/25
5:53 pm-10:14 pm
1 stop4h 21m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$154
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Fri 11/20
5:15 am-12:45 pm
1 stop7h 30m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$165
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Wed 11/11
5:30 am-12:29 pm
1 stop6h 59m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$215
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Sun 11/15
5:30 am-12:29 pm
1 stop6h 59m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$215
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Mon 11/9
3:35 pm-10:00 pm
2 stops6h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$222
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Fri 10/30
12:10 pm-6:20 pm
1 stop6h 10m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$223
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Mon 11/16
10:15 am-7:50 pm
2 stops9h 35m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$224
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Mon 11/2
3:35 pm-9:55 pm
2 stops6h 20m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$224
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Fri 12/18
5:30 am-11:17 am
1 stop5h 47m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$240
Showing 1-10 of 21 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 October.
| 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 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
Prices
Airlines
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 82 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, January is the cheapest month in which you can book a flight from Portland to Ontario (average of $217). Flying from Portland to Ontario in October is currently the most expensive (average of $367). 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 October 19, 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 10% versus a flight in the afternoon.
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 October 17, 2026.
Travelers seeking maximum savings on their Portland to Ontario flight should consider departing on Monday at noon 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 October 19, 2026.
Read through reviews of airlines operating flights from Portland to Ontario, such as Alaska Airlines,Southwest, andDelta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentAnonymous,Nov 2025
PDX - BNA
Overall
7.9
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentAnonymous,Nov 2025
PDX - BNA
Overall
7.9
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentAnonymous,Nov 2025
PDX - BNA
Overall
7.9
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentAnonymous,Nov 2025
PDX - BNA
Overall
7.9
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentAnonymous,Nov 2025
PDX - BNA
Overall
7.9
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.0
Reviews
1 / 20
8.0
ExcellentAnonymous,Nov 2025
PDX - BNA
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 October 19, 2026.
Portland and Ontario flights
Browse other Portland and Ontario flight options. Last updated on October 19, 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 October 19, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from Portland to Ontario
Discover the top 5 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 October 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$83 | Average$247 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$102 | Average$233 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$142 | Average$352 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$157 | Average$317 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$174 | Average$332 | FlexibilityNo cancel fee | On-time63% |