$88+ Cheap flights from Portland to Ontario (PDX - ONT)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Jul 10 — Jul 171
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 August or July, booked 47 days in advance, depart on a Friday or Tuesday and return on a Friday
Cheap flight deals from Portland to Ontario
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Best
Last-minute
One-way
Cheapest flights from Portland to OntarioExplore the most affordable flight options available from Portland to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 10, 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 June 10, 2026.
This Booking.com deal was found by Cheapflights users on 6/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/85:21 pm
PDX
- ONT
1 stop16h 43m
Frontier
Wed 7/223:40 pm
ONT
- PDX
1 stop26h 24m
Frontier
Deal found 6/6![Frontier logo]()
$232
This Southwest deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/210:00 am
PDX
- ONT
1 stop3h 25m
Southwest
Thu 8/272:40 pm
ONT
- PDX
1 stop4h 35m
Southwest
Deal found 6/7![Southwest logo]()
$233
This Southwest deal was found by Cheapflights users on 6/8. 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.
Mon 8/105:35 am
PDX
- ONT
1 stop6h 35m
Southwest
Mon 8/172:40 pm
ONT
- PDX
1 stop4h 35m
Southwest
Deal found 6/8![Southwest logo]()
$234
This Delta deal was found by Cheapflights users on 6/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/15:54 pm
PDX
- ONT
1 stop4h 58m
Delta
Tue 8/1111:56 am
ONT
- PDX
1 stop7h 48m
Delta
Deal found 6/9![Delta logo]()
$237
This CheapOair deal was found by Cheapflights users on 6/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/63:22 pm
PDX
- ONT
1 stop8h 33m
Frontier
Wed 10/282:35 pm
ONT
- PDX
1 stop26h 00m
Frontier
Deal found 6/8![Frontier logo]()
$240
This KAYAK deal was found by Cheapflights users on 6/8. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/25:20 am
PDX
- ONT
1 stop3h 45m
Southwest
Wed 8/51:15 pm
ONT
- PDX
1 stop7h 25m
Southwest
Deal found 6/8![Southwest logo]()
$241
This Southwest deal was found by Cheapflights users on 6/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/210:00 am
PDX
- ONT
1 stop3h 25m
Southwest
Sun 7/55:40 am
ONT
- PDX
1 stop3h 40m
Southwest
Deal found 6/9![Southwest logo]()
$242
This Frontier deal was found by Cheapflights users on 6/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/185:42 pm
PDX
- ONT
1 stop6h 07m
Frontier
Thu 8/2011:43 am
ONT
- PDX
1 stop5h 41m
Frontier
Deal found 6/7![Frontier logo]()
$244
This Booking.com deal was found by Cheapflights users on 6/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/1812:20 pm
PDX
- ONT
1 stop11h 30m
Frontier
Tue 7/216:00 am
ONT
- PDX
1 stop10h 31m
Frontier
Deal found 6/7![Frontier logo]()
$246
This Southwest deal was found by Cheapflights users on 6/8. 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.
Fri 7/105:30 am
PDX
- ONT
1 stop5h 00m
Southwest
Mon 7/136:30 pm
ONT
- PDX
1 stop4h 55m
Southwest
Deal found 6/8![Southwest logo]()
$247
This Expedia deal was found by Cheapflights users on 6/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:16 pm
PDX
- ONT
1 stop6h 34m
Frontier
Thu 7/163:40 pm
ONT
- PDX
1 stop25h 14m
Frontier
Deal found 6/6![Frontier logo]()
$249
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 June 10, 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 June 10, 2026.
This Southwest deal was found by Cheapflights users on 6/8. 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.
Mon 8/105:35 am
PDX
- ONT
1 stop6h 35m
Southwest
Mon 8/172:40 pm
ONT
- PDX
1 stop4h 35m
Southwest
Deal found 6/8![Southwest logo]()
$234
This Delta deal was found by Cheapflights users on 6/8. 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.
Wed 8/53:25 pm
PDX
- ONT
1 stop7h 20m
Delta
Sun 8/165:05 pm
ONT
- PDX
1 stop6h 34m
Delta
Deal found 6/8![Delta logo]()
$237
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/17:00 am
PDX
- ONT
1 stop5h 12m
United Airlines
Tue 9/81:56 pm
ONT
- PDX
1 stop6h 25m
United Airlines
Deal found 6/8![United Airlines logo]()
$255
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 7/117:36 am
PDX
- ONT
Nonstop2h 20m
Alaska Airlines
Mon 7/277:00 am
ONT
- PDX
Nonstop2h 21m
Alaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 6/6. 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 8/244:20 pm
PDX
- ONT
1 stop5h 50m
Southwest
Fri 8/282:40 pm
ONT
- PDX
1 stop4h 35m
Southwest
Deal found 6/6![Southwest logo]()
$252
This Delta deal was found by Cheapflights users on 6/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/15:54 pm
PDX
- ONT
1 stop4h 58m
Delta
Sat 8/85:05 pm
ONT
- PDX
1 stop5h 33m
Delta
Deal found 6/9![Delta logo]()
$253
This Delta deal was found by Cheapflights users on 6/7. 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.
Sat 7/113:30 pm
PDX
- ONT
1 stop7h 22m
Delta
Mon 7/2711:59 am
ONT
- PDX
1 stop5h 07m
Delta
Deal found 6/7![Delta logo]()
$257
This Delta deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/285:30 am
PDX
- ONT
1 stop5h 34m
Delta
Mon 8/316:20 am
ONT
- PDX
1 stop5h 20m
Delta
Deal found 6/5![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 6/8. 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 8/97:00 am
PDX
- ONT
1 stop6h 25m
Southwest
Sat 8/155:40 am
ONT
- PDX
2 stops7h 10m
Southwest
Deal found 6/8![Southwest logo]()
$313
This Delta deal was found by Cheapflights users on 6/6. 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.
Fri 7/105:30 am
PDX
- ONT
1 stop5h 47m
Delta
Mon 7/2711:59 am
ONT
- PDX
1 stop5h 07m
Delta
Deal found 6/6![Delta logo]()
$269
Last-minute flights from Portland to OntarioDiscover last-minute flight deals from Portland to Ontario. Data last updated June 10, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Ontario. Data last updated June 10, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 6/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/235:20 pm
PDX
- ONT
1 stop6h 29m
Frontier
Tue 7/76:00 am
ONT
- PDX
1 stop10h 31m
Frontier
Deal found 6/8![Frontier logo]()
$250
This Frontier deal was found by Cheapflights users on 6/10. 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.
Wed 7/15:20 pm
PDX
- ONT
1 stop6h 29m
Frontier
Sat 7/46:00 am
ONT
- PDX
1 stop10h 57m
Frontier
Deal found 6/10![Frontier logo]()
$244
This Southwest deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/210:00 am
PDX
- ONT
1 stop3h 25m
Southwest
Thu 8/272:40 pm
ONT
- PDX
1 stop4h 35m
Southwest
Deal found 6/7![Southwest logo]()
$233
This Southwest deal was found by Cheapflights users on 6/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/210:00 am
PDX
- ONT
1 stop3h 25m
Southwest
Sun 7/55:40 am
ONT
- PDX
1 stop3h 40m
Southwest
Deal found 6/9![Southwest logo]()
$242
This Booking.com deal was found by Cheapflights users on 6/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/65:49 pm
PDX
- ONT
1 stop21h 25m
Frontier
Wed 7/83:40 pm
ONT
- PDX
1 stop26h 24m
Frontier
Deal found 6/6![Frontier logo]()
$251
This Booking.com deal was found by Cheapflights users on 6/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/85:21 pm
PDX
- ONT
1 stop16h 43m
Frontier
Wed 7/223:40 pm
ONT
- PDX
1 stop26h 24m
Frontier
Deal found 6/6![Frontier logo]()
$232
This Southwest deal was found by Cheapflights users on 6/8. 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.
Fri 7/105:30 am
PDX
- ONT
1 stop5h 00m
Southwest
Mon 7/136:30 pm
ONT
- PDX
1 stop4h 55m
Southwest
Deal found 6/8![Southwest logo]()
$247
This Southwest deal was found by Cheapflights users on 6/10. 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 7/115:25 am
PDX
- ONT
2 stops7h 20m
Southwest
Tue 7/1410:20 am
ONT
- PDX
1 stop6h 20m
Southwest
Deal found 6/10![Southwest logo]()
$252
This Delta deal was found by Cheapflights users on 6/10. 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 7/113:30 pm
PDX
- ONT
1 stop7h 22m
Delta
Mon 7/2711:59 am
ONT
- PDX
1 stop5h 07m
Delta
Deal found 6/10![Delta logo]()
$253
This Expedia deal was found by Cheapflights users on 6/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:16 pm
PDX
- ONT
1 stop6h 34m
Frontier
Thu 7/163:40 pm
ONT
- PDX
1 stop25h 14m
Frontier
Deal found 6/6![Frontier logo]()
$249
This Booking.com deal was found by Cheapflights users on 6/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/1812:20 pm
PDX
- ONT
1 stop11h 30m
Frontier
Tue 7/216:00 am
ONT
- PDX
1 stop10h 31m
Frontier
Deal found 6/7![Frontier logo]()
$246
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 June 10, 2026.
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated June 10, 2026.
This United Airlines deal was found by Cheapflights users on 6/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/123:43 pm
PDX
- ONT
1 stop4h 18m
United Airlines
Deal found 6/9![United Airlines logo]()
$88
This Delta deal was found by Cheapflights users on 6/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/153:25 pm
PDX
- ONT
1 stop7h 20m
Delta
Deal found 6/9![Delta logo]()
$104
This Booking.com deal was found by Cheapflights users on 6/9. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/45:16 pm
PDX
- ONT
1 stop6h 34m
Frontier
Deal found 6/9![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 6/5. 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.
Wed 7/295:21 pm
PDX
- ONT
1 stop6h 29m
Frontier
Deal found 6/5![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 6/10. 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 7/145:16 pm
PDX
- ONT
1 stop6h 34m
Frontier
Deal found 6/10![Frontier logo]()
$114
This Frontier deal was found by Cheapflights users on 6/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:42 pm
PDX
- ONT
1 stop6h 07m
Frontier
Deal found 6/8![Frontier logo]()
$115
This Southwest deal was found by Cheapflights users on 6/8. 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.
Fri 8/216:20 am
PDX
- ONT
1 stop5h 05m
Southwest
Deal found 6/8![Southwest logo]()
$118
This Southwest deal was found by Cheapflights users on 6/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1610:00 am
PDX
- ONT
1 stop3h 25m
Southwest
Deal found 6/9![Southwest logo]()
$119
This Super.com deal was found by Cheapflights users on 6/9. 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 7/85:21 pm
PDX
- ONT
1 stop16h 43m
Frontier
Deal found 6/9![Frontier logo]()
$120
This Booking.com deal was found by Cheapflights users on 6/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/155:21 pm
PDX
- ONT
1 stop16h 43m
Frontier
Deal found 6/7![Frontier logo]()
$121
This Delta deal was found by Cheapflights users on 6/8. 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.
Thu 7/93:30 pm
PDX
- ONT
1 stop7h 22m
Delta
Deal found 6/8![Delta logo]()
$124
This United Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/217:00 am
PDX
- ONT
1 stop5h 12m
United Airlines
Deal found 6/7![United Airlines logo]()
$125
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 June 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $232 (Booking.com) |
One-way from | $88 (United Airlines) |
Popular in | May |
Cheapest in | August |
Average price | $278 |
Good round-trip deal | $307 or less |
Good one-way deal | $183 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 2,558,603 searches. Data last updated June 10, 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 - ONT
PDXONT
Portland
Mon 8/10
5:35 am-12:10 pm
1 stop6h 35m
Ontario
Mon 8/17
2:40 pm-7:15 pm
1 stop4h 35m
$234
PortlandOntario
PDX - ONT
PDXONT
Portland
Wed 8/5
3:25 pm-10:45 pm
1 stop7h 20m
Ontario
Sun 8/16
5:05 pm-11:39 pm
1 stop6h 34m
$237
PortlandOntario
PDX - ONT
PDXONT
Portland
Mon 8/24
4:20 pm-10:10 pm
1 stop5h 50m
Ontario
Fri 8/28
2:40 pm-7:15 pm
1 stop4h 35m
$252
PortlandOntario
PDX - ONT
PDXONT
Portland
Sat 8/1
5:54 pm-10:52 pm
1 stop4h 58m
Ontario
Sat 8/8
5:05 pm-10:38 pm
1 stop5h 33m
$253
PortlandOntario
PDX - ONT
PDXONT
Portland
Tue 9/1
7:00 am-12:12 pm
1 stop5h 12m
Ontario
Tue 9/8
1:56 pm-8:21 pm
1 stop6h 25m
$255
PortlandOntario
PDX - ONT
PDXONT
Portland
Sat 7/11
3:30 pm-10:52 pm
1 stop7h 22m
Ontario
Mon 7/27
11:59 am-5:06 pm
1 stop5h 07m
$257
PortlandOntario
PDX - ONT
PDXONT
Portland
Fri 8/28
5:30 am-11:04 am
1 stop5h 34m
Ontario
Mon 8/31
6:20 am-11:40 am
1 stop5h 20m
$267
PortlandOntario
PDX - ONT
PDXONT
Portland
Fri 7/10
5:30 am-11:17 am
1 stop5h 47m
Ontario
Mon 7/27
11:59 am-5:06 pm
1 stop5h 07m
$269
Quickest round-trip
PortlandOntario
PDX - ONT
PDXONT
Portland
Sat 7/11
7:36 am-9:56 am
Nonstop2h 20m
Ontario
Mon 7/27
7:00 am-9:21 am
Nonstop2h 21m
$297
PortlandOntario
PDX - ONT
PDXONT
Portland
Sun 8/9
7:00 am-1:25 pm
1 stop6h 25m
Ontario
Sat 8/15
5:40 am-12:50 pm
2 stops7h 10m
$313
Showing 1-10 of 20 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 June.
| 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 Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- 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
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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, August is the cheapest month in which you can book a flight from Portland to Ontario (average of $173). Flying from Portland to Ontario in May 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 June 10, 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 36% 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 May 30, 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. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
What’s the top layover airport for flights from Portland to Ontario?
Share of 1-stop round-trip flights from Portland to Ontario chosen by Cheapflights users in the past 12 months, using the same layover each way.
Sacramento (SMF) – chosen by Cheapflights users on 88% of 1-stop itineraries from Portland to Ontario on Cheapflights.
What’s the cheapest layover airport for flights from Portland to Ontario?
Average round-trip fare for 1-stop flights from Portland to Ontario, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Sacramento (SMF) is the most affordable 1-stop option, with an average round-trip price of $270.
What’s the fastest layover option from Portland to Ontario?
Shortest average travel time for 1-stop one-way flights from Portland to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Sacramento (SMF) have the shortest average one-way travel time for 1-stop routes: 3h 40m.
Which airport typically offers the quickest layover for flights from Portland to Ontario?
Average layover duration for 1-stop one-way flights from Portland to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via San Francisco (SFO) offer the fastest connection on this route, with an average layover time of 0h 42m.
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 June 10, 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
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
7.9
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Related info for your journey
Find useful and relevant information for your journey from Portland to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Portland to Ontario
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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Portland to Ontario by cabin class
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 June 10, 2026.
Portland and Ontario flights
Browse other Portland and Ontario flight options. Last updated on June 10, 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 June 10, 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 2,558,603 searches. Data last updated June 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$51 | Average$148 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$83 | Average$247 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$88 | Average$218 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$142 | Average$229 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$157 | Average$287 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$166 | Average$281 | FlexibilityNo cancel fee | On-time63% |