$103+ 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 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PDX
Oct 29 — Nov 51
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 Wednesday or Sunday 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 September 29, 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 September 29, 2026.
This WAYA deal was found by Cheapflights users on 9/25. 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.
Sat 10/3111:29 am -
Nonstop2h 21m
Mon 11/92:50 pm -
1 stop4h 38m
Deal found 9/25![Multiple Airlines logo]()
$261
This Frontier deal was found by Cheapflights users on 9/29. 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.
Fri 11/208:02 am -
1 stop5h 01m
Wed 11/2510:10 pm -
1 stop8h 57m
Deal found 9/29![Frontier logo]()
$264
This Priceline deal was found by Cheapflights users on 9/26. 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.
Wed 10/2811:29 am -
Nonstop2h 21m
Sat 10/315:06 am -
1 stop5h 11m
Deal found 9/26![Alaska Airlines logo]()
$267
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:40 am -
1 stop3h 30m
Wed 10/285:30 pm -
1 stop3h 50m
Deal found 9/25![Southwest logo]()
$268
This CheapOair deal was found by Cheapflights users on 9/29. 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 11/244:33 pm -
1 stop16h 59m
Tue 12/15:09 pm -
1 stop17h 36m
Deal found 9/29![Frontier logo]()
$269
This Mytrip deal was found by Cheapflights users on 9/28. 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.
Tue 10/274:42 pm -
1 stop4h 08m
Thu 10/2912:02 pm -
1 stop22h 40m
Deal found 9/28![Multiple Airlines logo]()
$270
This Southwest deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:40 am -
1 stop3h 30m
Sat 10/316:30 am -
1 stop4h 25m
Deal found 9/26![Southwest logo]()
$272
This Cheapflightsfares deal was found by Cheapflights users on 9/24. 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 10/158:35 pm -
1 stop15h 05m
Tue 10/2011:49 am -
1 stop22h 40m
Deal found 9/24![Frontier logo]()
$274
This FlightHub deal was found by Cheapflights users on 9/28. 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.
Wed 10/2810:35 am -
1 stop25h 01m
Fri 10/3012:31 pm -
1 stop20h 34m
Deal found 9/28![Frontier logo]()
$275
This Cheapflightsfares deal was found by Cheapflights users on 9/24. 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 10/176:15 am -
1 stop28h 39m
Mon 10/1912:25 pm -
1 stop22h 06m
Deal found 9/24![Frontier logo]()
$276
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/103:05 pm -
1 stop4h 15m
Tue 11/177:30 am -
1 stop5h 45m
Deal found 9/25![Southwest logo]()
$277
This Southwest deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:40 am -
1 stop3h 30m
Tue 11/310:15 am -
2 stops7h 25m
Deal found 9/26![Southwest logo]()
$278
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 September 29, 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 September 29, 2026.
This Delta deal was found by Cheapflights users on 9/24. 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 10/275:03 pm -
1 stop6h 44m
Mon 11/29:55 am -
1 stop6h 28m
Deal found 9/24![Delta logo]()
$293
This United Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/511:20 am -
1 stop7h 11m
Sun 12/65:00 am -
1 stop7h 34m
Deal found 9/26![United Airlines logo]()
$293
This Southwest deal was found by Cheapflights users on 9/25. 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 11/43:20 pm -
2 stops6h 10m
Fri 11/65:30 am -
1 stop5h 10m
Deal found 9/25![Southwest logo]()
$298
This Alaska Airlines deal was found by Cheapflights users on 9/25. 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 12/226:11 pm -
Nonstop2h 24m
Fri 1/12:49 pm -
Nonstop2h 26m
Deal found 9/25![Alaska Airlines logo]()
$367
This United Airlines deal was found by Cheapflights users on 9/28. 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 10/221:52 pm -
1 stop4h 39m
Mon 10/261:25 pm -
1 stop6h 50m
Deal found 9/28![United Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 9/28. 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 12/51:05 pm -
2 stops6h 40m
Sun 12/66:10 am -
1 stop6h 30m
Deal found 9/28![Southwest logo]()
$323
This Delta deal was found by Cheapflights users on 9/28. 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 10/299:45 am -
1 stop6h 25m
Sun 11/15:49 pm -
1 stop4h 54m
Deal found 9/28![Delta logo]()
$329
This Delta deal was found by Cheapflights users on 9/25. 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 12/225:38 pm -
1 stop6h 10m
Fri 1/15:05 am -
1 stop6h 14m
Deal found 9/25![Delta logo]()
$348
This Alaska Airlines deal was found by Cheapflights users on 9/27. 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 10/217:25 am -
Nonstop2h 20m
Sat 10/247:00 am -
1 stop10h 05m
Deal found 9/27![Alaska Airlines logo]()
$395
This Southwest deal was found by Cheapflights users on 9/25. 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 10/96:55 pm -
1 stop6h 30m
Fri 10/165:00 am -
1 stop6h 25m
Deal found 9/25![Southwest logo]()
$367
This Southwest deal was found by Cheapflights users on 9/24. 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 10/227:05 pm -
1 stop4h 45m
Mon 10/2612:50 pm -
2 stops8h 35m
Deal found 9/24![Southwest logo]()
$369
Last-minute flights from Ontario to PortlandDiscover last-minute flight deals from Ontario to Portland. Data last updated September 29, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Portland. Data last updated September 29, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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.
Wed 10/145:25 pm -
1 stop18h 01m
Tue 10/2011:49 am -
1 stop22h 40m
Deal found 9/29![Frontier logo]()
$269
This Cheapflightsfares deal was found by Cheapflights users on 9/24. 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 10/158:35 pm -
1 stop15h 05m
Tue 10/2011:49 am -
1 stop22h 40m
Deal found 9/24![Frontier logo]()
$274
This Cheapflightsfares deal was found by Cheapflights users on 9/24. 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 10/176:15 am -
1 stop28h 39m
Mon 10/1912:25 pm -
1 stop22h 06m
Deal found 9/24![Frontier logo]()
$276
This Cheapflightsfares deal was found by Cheapflights users on 9/28. 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.
Mon 10/266:15 am -
1 stop28h 52m
Mon 11/212:31 pm -
1 stop21h 09m
Deal found 9/28![Frontier logo]()
$279
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:40 am -
1 stop3h 30m
Wed 10/285:30 pm -
1 stop3h 50m
Deal found 9/25![Southwest logo]()
$268
This Mytrip deal was found by Cheapflights users on 9/28. 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.
Tue 10/274:42 pm -
1 stop4h 08m
Thu 10/2912:02 pm -
1 stop22h 40m
Deal found 9/28![Multiple Airlines logo]()
$270
This Priceline deal was found by Cheapflights users on 9/27. 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.
Tue 10/274:42 pm -
1 stop4h 08m
Sat 10/315:06 am -
1 stop5h 11m
Deal found 9/27![Alaska Airlines logo]()
$277
This Priceline deal was found by Cheapflights users on 9/26. 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.
Wed 10/2811:29 am -
Nonstop2h 21m
Sat 10/315:06 am -
1 stop5h 11m
Deal found 9/26![Alaska Airlines logo]()
$267
This Southwest deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:40 am -
1 stop3h 30m
Sat 10/316:30 am -
1 stop4h 25m
Deal found 9/26![Southwest logo]()
$272
This FlightHub deal was found by Cheapflights users on 9/28. 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.
Wed 10/2810:35 am -
1 stop25h 01m
Fri 10/3012:31 pm -
1 stop20h 34m
Deal found 9/28![Frontier logo]()
$275
This WAYA deal was found by Cheapflights users on 9/25. 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.
Sat 10/3111:29 am -
Nonstop2h 21m
Mon 11/92:50 pm -
1 stop4h 38m
Deal found 9/25![Multiple Airlines logo]()
$261
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 September 29, 2026.
Search for one-way flight options from Ontario to Portland. Find affordable one-way fares based on user searches. Data last updated September 29, 2026.
This Booking.com deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/512:01 pm -
2 stops23h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$103
This Super.com deal was found by Cheapflights users on 9/29. 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 12/176:20 am -
1 stop9h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$118
This Frontier deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2110:05 am -
1 stop7h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 9/24. 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 1/216:30 am -
1 stop8h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$121
This Super.com deal was found by Cheapflights users on 9/28. 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 10/2111:26 am -
1 stop24h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$122
This Super.com deal was found by Cheapflights users on 9/27. 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 1/146:30 am -
1 stop8h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$123
This Frontier deal was found by Cheapflights users on 9/29. 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 12/3010:05 am -
1 stop7h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$125
This Frontier deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/268:02 am -
1 stop9h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 9/25. 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.
Mon 10/196:15 am -
1 stop28h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$129
This Booking.com deal was found by Cheapflights users on 9/27. 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 10/2611:52 am -
1 stop23h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$131
This Southwest deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:40 am -
1 stop3h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Southwest logo]()
$134
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 September 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $261 (WAYA) |
One-way from | $103 (Booking.com) |
Popular in | July |
Cheapest in | February |
Average price | $315 |
Good round-trip deal | $320 or less |
Good one-way deal | $195 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 September 29, 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 10/28
6:00 am-12:03 pm
1 stop6h 03m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$139
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Wed 11/18
3:20 pm-9:30 pm
2 stops6h 10m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$144
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Wed 11/25
11:57 am-6:55 pm
1 stop6h 58m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$155
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Fri 11/6
5:03 pm-10:18 pm
1 stop5h 15m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$155
Quickest round-trip
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Sat 10/31
7:25 am-9:45 am
Nonstop2h 20m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$159
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Tue 10/27
7:25 am-9:45 am
Nonstop2h 20m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$159
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Fri 10/30
11:56 am-8:00 pm
1 stop8h 04m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$165
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Tue 10/27
8:25 am-2:55 pm
2 stops6h 30m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$184
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Mon 11/30
5:56 pm-11:36 pm
1 stop5h 40m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$185
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Mon 11/23
1:35 pm-6:24 pm
1 stop4h 49m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$205
Showing 1-10 of 22 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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | 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
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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 $219). 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 September 29, 2026.
It’s typically best to fly out from Ontario to Portland in the evening. Doing so could potentially save you 71% on the flight price compared to flying in the morning, which is usually more expensive.
What is the cheapest day to fly from Ontario to Portland?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Portland. Price data was last updated on September 26, 2026.
Travelers seeking maximum savings on their Ontario to Portland flight should consider departing on Friday evenings when fares are most often at their lowest. Tuesday at noon 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 Ontario to Portland?
Share of 1-stop round-trip flights from Ontario to Portland chosen by Cheapflights users in the past 12 months, using the same layover each way.
Sacramento (SMF) – chosen by Cheapflights users on 67% of 1-stop itineraries from Ontario to Portland on Cheapflights.
What’s the cheapest layover airport for flights from Ontario to Portland?
Average round-trip fare for 1-stop flights from Ontario to Portland, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $222.
What’s the fastest layover option from Ontario to Portland?
Shortest average travel time for 1-stop one-way flights from Ontario to Portland, 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 38m.
Which airport typically offers the quickest layover for flights from Ontario to Portland?
Average layover duration for 1-stop one-way flights from Ontario to Portland, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Sacramento (SMF) offer the fastest connection on this route, with an average layover time of 1h 04m.
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 September 29, 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
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
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
Lincoln City
Durham
Longview
Lake Oswego
Cannon Beach
Vancouver
Kelso
Troutdale
Clackamas
McMinnville
The Dalles
Wilsonville
Stevenson
Tillamook
Hillsboro
Astoria
Gresham
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Complete your trip
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Ontario and Portland flights
Browse other Ontario and Portland flight options. Last updated on September 29, 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 September 29, 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 September 29, 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 September 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$90 | Average$286 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$98 | Average$216 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$157 | Average$309 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$188 | Average$287 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$190 | Average$294 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$205 | Average$341 | FlexibilityNo cancel fee | On-time85% |