$154+ Cheap flights from Ontario to Portland, ME (ONT - PWM)
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 12/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PWM
Nov 24 — Dec 11
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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.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 October 25, 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 October 25, 2026.
This Delta deal was found by Cheapflights users on 10/23. 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.
Mon 12/75:55 pm -
2 stops15h 02m
Thu 12/104:53 pm -
2 stops10h 04m
Deal found 10/23![Delta logo]()
$358
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Fri 11/65:00 am -
1 stop8h 02m
Tue 11/105:30 am -
2 stops13h 03m
Deal found 10/22![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 10/25. 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.
Thu 12/312:20 pm -
1 stop8h 32m
Tue 12/84:53 pm -
2 stops10h 04m
Deal found 10/25![Delta logo]()
$384
This Delta deal was found by Cheapflights users on 10/25. 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.
Fri 12/411:08 pm -
2 stops9h 56m
Wed 12/94:00 pm -
2 stops10h 57m
Deal found 10/25![Delta logo]()
$389
This Delta deal was found by Cheapflights users on 10/25. 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.
Fri 12/412:20 pm -
1 stop8h 32m
Tue 12/84:00 pm -
2 stops10h 57m
Deal found 10/25![Delta logo]()
$424
This Delta deal was found by Cheapflights users on 10/22. 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 11/66:00 pm -
2 stops13h 50m
Tue 11/104:03 pm -
2 stops10h 46m
Deal found 10/22![Delta logo]()
$433
This Southwest deal was found by Cheapflights users on 10/24. 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.
Fri 12/189:50 am -
2 stops11h 05m
Sat 1/165:05 am -
2 stops14h 15m
Deal found 10/24![Southwest logo]()
$457
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/105:00 am -
1 stop8h 02m
Wed 11/113:23 pm -
1 stop8h 28m
Deal found 10/21![United Airlines logo]()
$465
This Delta deal was found by Cheapflights users on 10/25. 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.
Thu 12/312:20 pm -
1 stop8h 32m
Thu 12/104:00 pm -
2 stops23h 17m
Deal found 10/25![Delta logo]()
$466
This Southwest deal was found by Cheapflights users on 10/22. 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 12/128:20 am -
2 stops10h 30m
Fri 12/181:25 pm -
2 stops12h 40m
Deal found 10/22![Southwest logo]()
$469
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 October 25, 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 October 25, 2026.
This Delta deal was found by Cheapflights users on 10/25. 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.
Fri 12/411:08 pm -
2 stops9h 56m
Wed 12/94:00 pm -
2 stops10h 57m
Deal found 10/25![Delta logo]()
$389
This United Airlines deal was found by Cheapflights users on 10/22. 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 11/106:00 am -
2 stops14h 21m
Wed 11/118:47 am -
2 stops12h 14m
Deal found 10/22![United Airlines logo]()
$475
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/106:00 am -
2 stops14h 21m
Sun 11/153:23 pm -
1 stop8h 28m
Deal found 10/21![United Airlines logo]()
$538
This United Airlines deal was found by Cheapflights users on 10/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:00 am -
2 stops14h 21m
Sat 11/213:23 pm -
1 stop8h 28m
Deal found 10/25![United Airlines logo]()
$565
This Delta deal was found by Cheapflights users on 10/24. 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.
Sat 12/1911:14 am -
1 stop8h 55m
Sat 1/165:30 am -
1 stop9h 28m
Deal found 10/24![Delta logo]()
$639
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/186:00 am -
2 stops14h 21m
Sat 11/213:23 pm -
1 stop8h 28m
Deal found 10/23![United Airlines logo]()
$654
This Delta deal was found by Cheapflights users on 10/22. 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 12/1812:20 pm -
1 stop8h 32m
Sun 1/35:35 am -
1 stop21h 06m
Deal found 10/22![Delta logo]()
$799
This United Airlines deal was found by Cheapflights users on 10/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/205:00 am -
1 stop8h 02m
Mon 11/233:23 pm -
1 stop8h 28m
Deal found 10/25![United Airlines logo]()
$706
This United Airlines deal was found by Cheapflights users on 10/22. 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 11/226:00 am -
2 stops14h 21m
Thu 11/268:08 am -
1 stop10h 51m
Deal found 10/22![United Airlines logo]()
$712
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Mon 11/235:00 am -
1 stop8h 02m
Fri 11/277:00 am -
1 stop8h 33m
Deal found 10/22![United Airlines logo]()
$745
This United Airlines deal was found by Cheapflights users on 10/23. 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.
Fri 11/205:00 am -
1 stop8h 02m
Fri 11/277:00 am -
1 stop8h 33m
Deal found 10/23![United Airlines logo]()
$801
Last-minute flights from Ontario to PortlandDiscover last-minute flight deals from Ontario to Portland. Data last updated October 25, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Portland. Data last updated October 25, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Fri 11/65:00 am -
1 stop8h 02m
Tue 11/105:30 am -
2 stops13h 03m
Deal found 10/22![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 10/22. 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 11/66:00 pm -
2 stops13h 50m
Tue 11/104:03 pm -
2 stops10h 46m
Deal found 10/22![Delta logo]()
$433
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/105:00 am -
1 stop8h 02m
Wed 11/113:23 pm -
1 stop8h 28m
Deal found 10/21![United Airlines logo]()
$465
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/105:00 am -
1 stop8h 02m
Mon 11/163:23 pm -
1 stop8h 28m
Deal found 10/21![United Airlines logo]()
$493
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/105:00 am -
1 stop8h 02m
Sun 11/153:23 pm -
1 stop8h 28m
Deal found 10/21![United Airlines logo]()
$533
This United Airlines deal was found by Cheapflights users on 10/22. 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 11/245:00 am -
1 stop8h 02m
Thu 11/268:08 am -
1 stop10h 51m
Deal found 10/22![United Airlines logo]()
$548
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 October 25, 2026.
Search for one-way flight options from Ontario to Portland. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.
This United Airlines deal was found by Cheapflights users on 10/23. 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.
Mon 12/146:40 pm -
2 stops11h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![United Airlines logo]()
$154
This Delta deal was found by Cheapflights users on 10/22. 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 12/1812:20 pm -
1 stop8h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Delta logo]()
$156
This Southwest deal was found by Cheapflights users on 10/23. 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 12/139:55 am -
2 stops11h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Southwest logo]()
$165
This Delta deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:18 pm -
1 stop8h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Delta logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 10/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/126:30 am -
3 stops32h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Multiple Airlines logo]()
$180
This American Airlines deal was found by Cheapflights users on 10/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/126:20 am -
2 stops12h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![American Airlines logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 10/23. 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.
Mon 12/1411:30 am -
3 stops42h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Multiple Airlines logo]()
$209
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/105:00 am -
1 stop8h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![United Airlines logo]()
$214
This Delta deal was found by Cheapflights users on 10/23. 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 12/1910:35 pm -
2 stops10h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Delta logo]()
$228
This Delta deal was found by Cheapflights users on 10/25. 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.
Thu 12/1011:08 pm -
2 stops14h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Delta logo]()
$235
This Southwest deal was found by Cheapflights users on 10/23. 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 12/186:30 pm -
2 stops11h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Southwest logo]()
$246
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 (PWM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $258 (Southwest) |
One-way from | $154 (United Airlines) |
Popular in | March |
Cheapest in | October |
Average price | $397 |
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 October 25, 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 - PWM Portland
ONTPWM
Ontario
Mon 12/14
6:40 pm-9:05 am
2 stops11h 25m
Portland
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$154
OntarioPortland
ONT Ontario - PWM Portland
ONTPWM
Ontario
Fri 12/18
12:20 pm-11:52 pm
1 stop8h 32m
Portland
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$156
OntarioPortland
ONT Ontario - PWM Portland
ONTPWM
Ontario
Sun 12/13
9:55 am-11:55 pm
2 stops11h 00m
Portland
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$165
OntarioPortland
ONT Ontario - PWM Portland
ONTPWM
Ontario
Tue 1/12
6:30 am-5:51 pm
3 stops32h 21m
Portland
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$180
Quickest round-trip
OntarioPortland
ONT Ontario - PWM Portland
ONTPWM
Ontario
Wed 11/25
5:00 am-4:02 pm
1 stop8h 02m
Portland
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$214
OntarioPortland
ONT Ontario - PWM Portland
ONTPWM
Ontario
Thu 12/10
11:08 pm-4:39 pm
2 stops14h 31m
Portland
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$235
OntarioPortland
ONT Ontario - PWM Portland
ONTPWM
Ontario
Fri 12/18
6:30 pm-9:25 am
2 stops11h 55m
Portland
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$246
OntarioPortland
ONT Ontario - PWM Portland
ONTPWM
Ontario
Tue 11/24
5:00 am-4:02 pm
1 stop8h 02m
Portland
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$360
OntarioPortland
ONT Ontario - PWM Portland
ONTPWM
Ontario
Mon 12/14
12:20 pm-11:52 pm
1 stop8h 32m
Portland
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$373
OntarioPortland
ONT Ontario - PWM Portland
ONTPWM
Ontario
Fri 12/4
11:08 pm-12:04 pm
2 stops9h 56m
Portland
Wed 12/9
4:00 pm-11:57 pm
2 stops10h 57m
$389
Showing 1-10 of 20 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 October.
| 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 |
- Most accurate provider: When it comes to deals on Ontario-Portland, Maine flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Portland, Maine flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Portland, Maine flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Portland, Maine 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, Maine 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-PWM
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.
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 October 25, 2026.
Peruse reviews from past customers who have flown with United Airlines from Ontario to Portland to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.3
Crew
8.1
Boarding
7.7
Entertainment
7.1
Food
6.7
Overall
7.3
Reviews
1 / 20
4.0
OkayDynasty,May 2026
LAX - EWR
Comfort
7.3
Crew
8.1
Boarding
7.7
Entertainment
7.1
Food
6.7
Overall
7.3
Reviews
1 / 20
4.0
OkayDynasty,May 2026
LAX - EWR
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 locationsLewiston
North Conway
Brunswick
Conway
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Ontario
Popular flights
Portland flight routes
Alternative routes for Ontario to Portland
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Portland by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Portland by cabin class
Find flights from Ontario to Portland, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Portland flights
Browse other Ontario and Portland flight options. Last updated on October 25, 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 October 25, 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 October 25, 2026.
Top airline flying from Ontario to Portland
Discover the top airline 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 October 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$397 | Average$514 | FlexibilityNo cancel fee | On-time69% |