$630+ Cheap flights from Portland, ME (PWM) to Porto (OPO)
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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — OPO
Oct 15 — Oct 221
Round-trip
1 adult, Economy
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Find cheap flights from Portland to Porto 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 Portland to Porto
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Cheapest flights from Portland to PortoExplore the most affordable flight options available from Portland to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
Explore the most affordable flight options available from Portland to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:15 pm -
1 stop11h 00m
Fri 11/65:00 am -
2 stops24h 10m
Deal found 9/15![Delta logo]()
$630
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2911:55 am -
2 stops18h 40m
Thu 11/510:15 am -
1 stop18h 55m
Deal found 9/14![Delta logo]()
$635
This KLM deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:15 pm -
2 stops19h 10m
Fri 11/65:55 am -
2 stops20h 05m
Deal found 9/15![KLM logo]()
$661
This United Airlines deal was found by Cheapflights users on 9/12. 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 10/273:41 pm -
1 stop13h 49m
Tue 11/36:00 am -
2 stops18h 02m
Deal found 9/12![United Airlines logo]()
$706
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:50 am -
1 stop18h 40m
Thu 11/512:35 pm -
1 stop15h 46m
Deal found 9/14![United Airlines logo]()
$716
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:06 am -
1 stop19h 49m
Thu 10/112:35 pm -
1 stop15h 53m
Deal found 9/15![United Airlines logo]()
$985
This United Airlines deal was found by Cheapflights users on 9/13. 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 9/1810:50 am -
1 stop17h 55m
Tue 9/296:00 am -
2 stops22h 59m
Deal found 9/13![United Airlines logo]()
$1,036
This United Airlines deal was found by Cheapflights users on 9/13. 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 12/73:20 pm -
1 stop13h 10m
Fri 12/116:00 am -
2 stops20h 29m
Deal found 9/13![United Airlines logo]()
$1,080
Best flights from Portland to PortoDiscover carefully curated flight deals from Portland to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
Discover carefully curated flight deals from Portland to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:15 pm -
1 stop11h 00m
Fri 11/65:00 am -
2 stops24h 10m
Deal found 9/15![Delta logo]()
$630
This KLM deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:15 pm -
2 stops19h 10m
Fri 11/65:55 am -
2 stops20h 05m
Deal found 9/15![KLM logo]()
$661
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:50 am -
1 stop18h 40m
Thu 11/512:35 pm -
1 stop15h 46m
Deal found 9/14![United Airlines logo]()
$716
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2911:55 am -
2 stops18h 40m
Thu 11/510:15 am -
1 stop18h 55m
Deal found 9/14![Delta logo]()
$635
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/73:20 pm -
1 stop13h 10m
Fri 12/116:00 am -
2 stops20h 29m
Deal found 9/14![United Airlines logo]()
$1,080
Last-minute flights from Portland to PortoDiscover last-minute flight deals from Portland to Porto. Data last updated September 15, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Porto. Data last updated September 15, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:53 pm -
2 stops39h 52m
Mon 9/216:00 am -
2 stops22h 59m
Deal found 9/15![United Airlines logo]()
$1,123
This United Airlines deal was found by Cheapflights users on 9/13. 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 9/1810:50 am -
1 stop17h 55m
Tue 9/296:00 am -
2 stops22h 59m
Deal found 9/13![United Airlines logo]()
$1,036
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:06 am -
1 stop19h 49m
Thu 10/112:35 pm -
1 stop15h 53m
Deal found 9/15![United Airlines logo]()
$985
This United Airlines deal was found by Cheapflights users on 9/12. 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 10/273:41 pm -
1 stop13h 49m
Tue 11/36:00 am -
2 stops18h 02m
Deal found 9/12![United Airlines logo]()
$706
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2911:55 am -
2 stops18h 40m
Thu 11/510:15 am -
1 stop18h 55m
Deal found 9/14![Delta logo]()
$635
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:50 am -
1 stop18h 40m
Thu 11/512:35 pm -
1 stop15h 46m
Deal found 9/14![United Airlines logo]()
$716
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:15 pm -
1 stop11h 00m
Fri 11/65:00 am -
2 stops24h 10m
Deal found 9/15![Delta logo]()
$630
This KLM deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/304:15 pm -
2 stops19h 10m
Fri 11/65:55 am -
2 stops20h 05m
Deal found 9/15![KLM logo]()
$661
Find flight deals from Portland to Porto
Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to Porto (OPO). 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 15, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $630 (Delta) |
Cheapflights Fare Finder
Customize your flight search to find flights from Portland to Porto 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 15, 2026.
Use the filters below to find and compare flights from Portland to Porto that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PortlandPorto
PWM Portland - OPO Porto
PWMOPO
Portland
Fri 10/30
4:15 pm-7:15 am
1 stop11h 00m
Porto
Fri 11/6
5:00 am-12:10 am
2 stops24h 10m
$630
PortlandPorto
PWM Portland - OPO Porto
PWMOPO
Portland
Thu 10/29
11:55 am-10:35 am
2 stops18h 40m
Porto
Thu 11/5
10:15 am-12:10 am
1 stop18h 55m
$635
PortlandPorto
PWM Portland - OPO Porto
PWMOPO
Portland
Fri 10/30
4:15 pm-3:25 pm
2 stops19h 10m
Porto
Fri 11/6
5:55 am-9:00 pm
2 stops20h 05m
$661
PortlandPorto
PWM Portland - OPO Porto
PWMOPO
Portland
Thu 10/29
10:50 am-9:30 am
1 stop18h 40m
Porto
Thu 11/5
12:35 pm-11:21 pm
1 stop15h 46m
$716
Quickest round-trip
PortlandPorto
PWM Portland - OPO Porto
PWMOPO
Portland
Mon 12/7
3:20 pm-9:30 am
1 stop13h 10m
Porto
Fri 12/11
6:00 am-9:29 pm
2 stops20h 29m
$1,080
Sorted by cheapest first
- Most accurate provider: When it comes to deals on Portland, Maine-Porto flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Portland, Maine-Porto flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Portland, Maine-Porto flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Portland, Maine-Porto flights, Cheapflights users trust Ovago the most. Ovago 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, Maine-Porto 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 Porto
Have a flexible travel schedule? Discover the best time to fly to Porto from Portland with our price prediction graph.
PWM-OPO
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.
Related info for your journey
Find useful and relevant information for your journey from Portland to Porto. 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 Porto?
Book flights to Porto if you plan to visit one of these locationsVila Nova de Gaia
Arcos de Valdevez
Coimbra
Aveiro
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