$84+ Cheap flights from Ontario to Portland (ONT - PDX)
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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PDX
Dec 9 — Dec 161
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Portland 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 Ontario to Portland are usually found in February or April, booked 66 days in advance, depart on a Sunday or Wednesday and return on a Monday
Cheap flight deals from Ontario to Portland
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to PortlandExplore the most affordable flight options available from Ontario to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 9, 2026.
Explore the most affordable flight options available from Ontario to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 9, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 11/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/268:15 am -
1 stop9h 19m
Thu 12/31:58 pm -
1 stop10h 19m
Deal found 11/4![Frontier logo]()
$198
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1611:30 am -
1 stop24h 39m
Thu 1/1410:40 pm -
1 stop8h 36m
Deal found 11/4![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1810:48 pm -
1 stop22h 33m
Thu 1/1410:40 pm -
1 stop8h 36m
Deal found 11/4![Frontier logo]()
$202
This Trip.com deal was found by Cheapflights users on 11/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/511:00 am -
1 stop24h 53m
Mon 12/712:51 pm -
1 stop23h 00m
Deal found 11/5![Frontier logo]()
$203
This Super.com deal was found by Cheapflights users on 11/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2511:40 am -
1 stop25h 17m
Tue 12/15:09 pm -
1 stop17h 36m
Deal found 11/4![Frontier logo]()
$205
This Cheapflightsfares deal was found by Cheapflights users on 11/5. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1810:48 pm -
1 stop22h 33m
Sun 12/2010:28 pm -
1 stop22h 14m
Deal found 11/5![Frontier logo]()
$206
This Kiwi.com deal was found by Cheapflights users on 11/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/156:00 am -
1 stop10h 10m
Thu 1/1410:40 pm -
1 stop8h 36m
Deal found 11/6![Frontier logo]()
$208
This Delta deal was found by Cheapflights users on 11/6. 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.
Thu 12/177:00 am -
1 stop6h 35m
Mon 1/182:50 pm -
1 stop7h 44m
Deal found 11/6![Delta logo]()
$209
This Frontier deal was found by Cheapflights users on 11/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/136:00 am -
1 stop7h 03m
Thu 12/171:04 pm -
1 stop11h 09m
Deal found 11/5![Frontier logo]()
$210
This Cheapflightsfares deal was found by Cheapflights users on 11/5. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/268:12 am -
1 stop13h 21m
Wed 12/307:25 pm -
1 stop26h 10m
Deal found 11/5![Frontier logo]()
$212
This United Airlines deal was found by Cheapflights users on 11/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/164:17 pm -
1 stop6h 28m
Sat 1/161:18 pm -
1 stop4h 17m
Deal found 11/4![United Airlines logo]()
$213
This Super.com deal was found by Cheapflights users on 11/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2210:48 pm -
1 stop19h 42m
Mon 12/287:03 pm -
1 stop12h 58m
Deal found 11/4![Frontier logo]()
$214
Best flights from Ontario to PortlandDiscover carefully curated flight deals from Ontario to Portland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 9, 2026.
Discover carefully curated flight deals from Ontario to Portland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 9, 2026.
This Alaska Airlines deal was found by Cheapflights users on 11/5. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/510:50 am -
Nonstop2h 35m
Tue 12/87:45 am -
Nonstop2h 16m
Deal found 11/5![Alaska Airlines logo]()
$267
This Southwest deal was found by Cheapflights users on 11/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/95:40 am -
2 stops8h 55m
Tue 1/123:15 pm -
1 stop5h 45m
Deal found 11/5![Southwest logo]()
$284
This Delta deal was found by Cheapflights users on 11/7. 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.
Fri 12/256:00 am -
1 stop6h 23m
Thu 12/315:30 am -
1 stop5h 49m
Deal found 11/7![Delta logo]()
$305
This United Airlines deal was found by Cheapflights users on 11/6. 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 3/186:00 am -
1 stop6h 25m
Mon 3/221:35 pm -
Nonstop6h 44m
Deal found 11/6![United Airlines logo]()
$343
This Alaska Airlines deal was found by Cheapflights users on 11/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/126:10 pm -
Nonstop2h 17m
Mon 2/152:55 pm -
Nonstop2h 20m
Deal found 11/6![Alaska Airlines logo]()
$285
This Alaska Airlines deal was found by Cheapflights users on 11/5. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1110:03 am -
Nonstop2h 16m
Mon 2/157:01 am -
Nonstop2h 24m
Deal found 11/5![Alaska Airlines logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 11/7. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/243:59 pm -
1 stop4h 55m
Fri 1/15:40 pm -
Nonstop2h 26m
Deal found 11/7![Alaska Airlines logo]()
$296
This Southwest deal was found by Cheapflights users on 11/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/217:30 pm -
1 stop4h 05m
Thu 12/2410:15 am -
2 stops7h 25m
Deal found 11/6![Southwest logo]()
$372
This Southwest deal was found by Cheapflights users on 11/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/224:00 pm -
2 stops7h 30m
Tue 12/16:40 am -
1 stop3h 50m
Deal found 11/8![Southwest logo]()
$377
This Alaska Airlines deal was found by Cheapflights users on 11/5. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/16:01 pm -
Nonstop2h 30m
Mon 12/76:26 am -
1 stop4h 47m
Deal found 11/5![Alaska Airlines logo]()
$382
This Alaska Airlines deal was found by Cheapflights users on 11/7. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/236:10 pm -
Nonstop2h 17m
Sat 3/272:55 pm -
Nonstop2h 20m
Deal found 11/7![Alaska Airlines logo]()
$412
Last-minute flights from Ontario to PortlandDiscover last-minute flight deals from Ontario to Portland. Data last updated November 9, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Portland. Data last updated November 9, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 11/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2511:40 am -
1 stop25h 17m
Tue 12/15:09 pm -
1 stop17h 36m
Deal found 11/4![Frontier logo]()
$205
This Cheapflightsfares deal was found by Cheapflights users on 11/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/268:15 am -
1 stop9h 19m
Thu 12/31:58 pm -
1 stop10h 19m
Deal found 11/4![Frontier logo]()
$198
This Trip.com deal was found by Cheapflights users on 11/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/511:00 am -
1 stop24h 53m
Mon 12/712:51 pm -
1 stop23h 00m
Deal found 11/5![Frontier logo]()
$203
This Frontier deal was found by Cheapflights users on 11/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/136:00 am -
1 stop7h 03m
Thu 12/171:04 pm -
1 stop11h 09m
Deal found 11/5![Frontier logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 11/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/156:00 am -
1 stop10h 10m
Mon 1/1810:40 pm -
1 stop21h 57m
Deal found 11/6![Frontier logo]()
$208
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1611:30 am -
1 stop24h 39m
Thu 1/1410:40 pm -
1 stop8h 36m
Deal found 11/4![Frontier logo]()
$200
This United Airlines deal was found by Cheapflights users on 11/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/164:17 pm -
1 stop6h 28m
Sat 1/161:18 pm -
1 stop4h 17m
Deal found 11/4![United Airlines logo]()
$213
This Delta deal was found by Cheapflights users on 11/6. 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.
Thu 12/177:00 am -
1 stop6h 35m
Mon 1/182:50 pm -
1 stop7h 44m
Deal found 11/6![Delta logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1810:48 pm -
1 stop22h 33m
Thu 1/1410:40 pm -
1 stop8h 36m
Deal found 11/4![Frontier logo]()
$202
This Cheapflightsfares deal was found by Cheapflights users on 11/5. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1810:48 pm -
1 stop22h 33m
Sun 12/2010:28 pm -
1 stop22h 14m
Deal found 11/5![Frontier logo]()
$206
This Super.com deal was found by Cheapflights users on 11/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2210:48 pm -
1 stop19h 42m
Mon 12/287:03 pm -
1 stop12h 58m
Deal found 11/4![Frontier logo]()
$214
This Cheapflightsfares deal was found by Cheapflights users on 11/5. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/268:12 am -
1 stop13h 21m
Wed 12/307:25 pm -
1 stop26h 10m
Deal found 11/5![Frontier logo]()
$212
One-way flights from Ontario to PortlandSearch for one-way flight options from Ontario to Portland. Find affordable one-way fares based on user searches. Data last updated November 9, 2026.
Search for one-way flight options from Ontario to Portland. Find affordable one-way fares based on user searches. Data last updated November 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 11/5. 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.
Sat 1/98:50 am -
2 stops24h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$84
This WAYA deal was found by Cheapflights users on 11/5. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/157:26 pm -
1 stop14h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:06 pm -
2 stops17h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 11/5. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/26:30 am -
1 stop8h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Frontier logo]()
$89
This Frontier deal was found by Cheapflights users on 11/4. 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 12/36:00 am -
1 stop6h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![Frontier logo]()
$90
This Delta deal was found by Cheapflights users on 11/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/45:55 pm -
1 stop5h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/8![Delta logo]()
$94
This Delta deal was found by Cheapflights users on 11/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/15:12 pm -
1 stop6h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/8![Delta logo]()
$101
This Super.com deal was found by Cheapflights users on 11/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2511:40 am -
1 stop25h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![Frontier logo]()
$104
This Super.com deal was found by Cheapflights users on 11/7. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/2510:48 pm -
1 stop22h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/7![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/911:00 am -
1 stop24h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Frontier logo]()
$109
This Mytrip deal was found by Cheapflights users on 11/6. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1211:30 am -
1 stop25h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/6![Frontier logo]()
$111
This Super.com deal was found by Cheapflights users on 11/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/268:15 am -
1 stop9h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/4![Frontier logo]()
$114
Find flight deals from Ontario to Portland
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Portland (PDX). 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 November 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $198 (Cheapflightsfares) |
One-way from | $84 (Kiwi.com) |
Popular in | July |
Cheapest in | February |
Average price | $333 |
Good round-trip deal | $326 or less |
Good one-way deal | $249 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Portland 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 November 9, 2026.
Use the filters below to find and compare flights from Ontario to Portland that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Wed 12/9
6:00 am-12:28 pm
1 stop6h 28m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$94
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Fri 12/11
6:25 pm-11:05 pm
1 stop4h 40m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$94
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Fri 12/4
5:55 pm-11:39 pm
1 stop5h 44m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$94
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Tue 12/1
5:00 pm-9:50 pm
1 stop4h 50m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$140
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Tue 12/15
3:20 pm-9:30 pm
2 stops6h 10m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$145
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Sat 12/5
6:17 pm-8:52 pm
Nonstop2h 35m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$165
Quickest round-trip
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Thu 3/4
7:20 am-9:44 am
Nonstop2h 24m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$173
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Thu 12/3
7:10 am-9:40 am
Nonstop2h 30m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$173
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Fri 12/25
3:20 pm-9:30 pm
2 stops6h 10m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$214
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Fri 4/9
6:53 pm-12:54 am
1 stop6h 01m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$220
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Ontario to Portland
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 Ontario to Portland in November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Portland flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Portland flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Portland flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Portland 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 Ontario-Portland 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 Ontario to Portland
Have a flexible travel schedule? Discover the best time to fly to Portland from Ontario with our price prediction graph.
ONT-PDX
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 Ontario to Portland
Prices
Airlines
How far ahead should I book a flight from Ontario to Portland?
The price you pay for your flight from Ontario to Portland may vary depending on when you book. For the best chance of a lower fare, look to book 65 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 Ontario to Portland?
Currently, February is the cheapest month in which you can book a flight from Ontario to Portland (average of $222). Flying from Ontario to Portland in July is currently the most expensive (average of $337). 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 ONT to PDX?
Find hourly flight availability from Ontario to Portland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 9, 2026.
It’s typically best to fly out from Ontario to Portland in the evening. Doing so could potentially save you 72% on the flight price compared to flying in the morning, which is usually more expensive.
The best insider tips for Ontario to Portland 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 Ontario to Portland trip
Our travel experts
Reviews of airlines servicing Portland
Get insights into the airlines that provide service to Portland. 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 Portland. Reviews last updated November 9, 2026.
Read reviews from past customers who have flown Southwest,Alaska Airlines, andDelta from Ontario to Portland. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Related info for your journey
Find useful and relevant information for your journey from Ontario to Portland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Portland?
Book flights to Portland if you plan to visit one of these locationsBeaverton
Seaside
Durham
Cannon Beach
Longview
Lake Oswego
Lincoln City
Vancouver
Kelso
Troutdale
Clackamas
McMinnville
The Dalles
Wilsonville
Stevenson
Hillsboro
Astoria
Tillamook
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Complete your trip
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Search flights from Ontario to Portland by cabin class
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Ontario and Portland flights
Browse other Ontario and Portland flight options. Last updated on November 9, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on November 9, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Portland
Explore flights to Portland departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on November 9, 2026.
Top 6 airlines flying from Ontario to Portland
Discover the top 6 airlines that operate flights from Ontario to Portland. 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 November 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$287 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$126 | Average$255 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$157 | Average$313 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$168 | Average$301 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$188 | Average$291 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$205 | Average$341 | FlexibilityNo cancel fee | On-time85% |