$300+ Cheap flights from Portland (PDX) to Porto (OPO)
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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — OPO
Sep 12 — Sep 191
Round-trip
1 adult, Economy
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Find cheap flights from Portland to Porto with Cheapflights
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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
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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 August 13, 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 August 13, 2026.
This Expedia deal was found by Cheapflights users on 8/11. 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.
Wed 11/113:40 pm -
2 stops35h 35m
Wed 11/181:45 pm -
2 stops36h 46m
Deal found 8/11![Multiple Airlines logo]()
$730
This KLM deal was found by Cheapflights users on 8/11. 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.
Wed 11/117:05 am -
1 stop18h 00m
Wed 11/185:00 am -
1 stop14h 20m
Deal found 8/11![KLM logo]()
$733
This Delta deal was found by Cheapflights users on 8/11. 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 11/117:05 am -
2 stops19h 30m
Wed 11/185:00 am -
1 stop14h 20m
Deal found 8/11![Delta logo]()
$737
This Justfly.com deal was found by Cheapflights users on 8/11. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2410:00 am -
2 stops17h 45m
Wed 12/212:05 pm -
2 stops40h 28m
Deal found 8/11![Multiple Airlines logo]()
$748
This American Airlines deal was found by Cheapflights users on 8/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/245:00 am -
2 stops18h 40m
Wed 12/28:40 pm -
2 stops22h 25m
Deal found 8/8![American Airlines logo]()
$754
This United Airlines deal was found by Cheapflights users on 8/11. 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 12/78:46 am -
2 stops16h 44m
Fri 12/1112:35 pm -
2 stops29h 42m
Deal found 8/11![United Airlines logo]()
$755
This Delta deal was found by Cheapflights users on 8/11. 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 11/2411:31 am -
2 stops26h 29m
Wed 12/25:00 am -
1 stop14h 20m
Deal found 8/11![Delta logo]()
$767
This Justfly.com deal was found by Cheapflights users on 8/11. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:45 pm -
2 stops51h 15m
Thu 4/16:00 am -
2 stops20h 30m
Deal found 8/11![Air Canada logo]()
$821
This Delta deal was found by Cheapflights users on 8/11. 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 10/137:00 am -
1 stop19h 30m
Wed 10/285:00 am -
1 stop14h 20m
Deal found 8/11![Delta logo]()
$823
This Delta deal was found by Cheapflights users on 8/11. 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 10/141:05 pm -
1 stop18h 25m
Tue 10/2711:15 am -
1 stop32h 05m
Deal found 8/11![Delta logo]()
$827
This Delta deal was found by Cheapflights users on 8/11. 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 10/137:00 am -
2 stops19h 30m
Tue 10/2711:15 am -
1 stop32h 05m
Deal found 8/11![Delta logo]()
$828
This Delta deal was found by Cheapflights users on 8/11. 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 9/2811:20 am -
2 stops20h 10m
Thu 4/15:00 am -
1 stop14h 10m
Deal found 8/11![Delta logo]()
$832
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 August 13, 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 August 13, 2026.
This United Airlines deal was found by Cheapflights users on 8/12. 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.
Mon 12/77:00 am -
2 stops18h 30m
Fri 12/1112:35 pm -
2 stops29h 05m
Deal found 8/12![United Airlines logo]()
$755
This Delta deal was found by Cheapflights users on 8/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2411:31 am -
2 stops26h 29m
Wed 12/25:00 am -
1 stop14h 20m
Deal found 8/8![Delta logo]()
$767
This KLM deal was found by Cheapflights users on 8/8. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/237:00 am -
1 stop19h 30m
Mon 11/25:00 am -
1 stop14h 20m
Deal found 8/8![KLM logo]()
$893
This Delta deal was found by Cheapflights users on 8/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:10 am -
1 stop19h 20m
Fri 10/95:00 am -
1 stop14h 10m
Deal found 8/12![Delta logo]()
$853
This Delta deal was found by Cheapflights users on 8/11. 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 10/167:00 am -
1 stop19h 30m
Thu 10/2910:00 am -
1 stop17h 50m
Deal found 8/11![Delta logo]()
$890
Last-minute flights from Portland to PortoDiscover last-minute flight deals from Portland to Porto. Data last updated August 13, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Porto. Data last updated August 13, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 8/12. 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.
Mon 9/2111:09 pm -
1 stop23h 06m
Tue 10/1312:15 pm -
2 stops42h 08m
Deal found 8/12![United Airlines logo]()
$850
This Delta deal was found by Cheapflights users on 8/11. 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 9/211:05 pm -
1 stop18h 25m
Tue 10/135:00 am -
1 stop14h 10m
Deal found 8/11![Delta logo]()
$857
This Air Canada deal was found by Cheapflights users on 8/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/267:45 pm -
2 stops51h 15m
Fri 10/166:20 am -
2 stops35h 11m
Deal found 8/11![Multiple Airlines logo]()
$852
This Justfly.com deal was found by Cheapflights users on 8/11. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:45 pm -
2 stops51h 15m
Thu 4/16:00 am -
2 stops20h 30m
Deal found 8/11![Air Canada logo]()
$821
This Air France deal was found by Cheapflights users on 8/11. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:10 am -
1 stop19h 20m
Thu 4/15:00 am -
1 stop14h 10m
Deal found 8/11![Multiple Airlines logo]()
$823
This Delta deal was found by Cheapflights users on 8/11. 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 9/2811:20 am -
2 stops20h 10m
Thu 4/15:00 am -
1 stop14h 10m
Deal found 8/11![Delta logo]()
$832
This United Airlines deal was found by Cheapflights users on 8/11. 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 9/287:02 am -
2 stops15h 58m
Thu 4/16:00 am -
3 stops46h 33m
Deal found 8/11![United Airlines logo]()
$846
This Delta deal was found by Cheapflights users on 8/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:10 am -
1 stop19h 20m
Fri 10/95:00 am -
1 stop14h 10m
Deal found 8/12![Delta logo]()
$853
One-way flights from Portland to PortoSearch for one-way flight options from Portland to Porto. Find affordable one-way fares based on user searches. Data last updated August 13, 2026.
Search for one-way flight options from Portland to Porto. Find affordable one-way fares based on user searches. Data last updated August 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/53:30 pm -
3 stops33h 05m
Deal found 8/10![Multiple Airlines logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/73:30 pm -
2 stops22h 00m
Deal found 8/11![Multiple Airlines logo]()
$320
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/303:30 pm -
2 stops24h 05m
Deal found 8/10![Multiple Airlines logo]()
$358
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/33:30 pm -
2 stops20h 55m
Deal found 8/10![Multiple Airlines logo]()
$418
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/269:32 pm -
3 stops49h 48m
Deal found 8/8![Multiple Airlines logo]()
$425
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2512:38 pm -
3 stops49h 57m
Deal found 8/9![Multiple Airlines logo]()
$427
Find flight deals from Portland to Porto
Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) 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 August 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $730 (Expedia) |
One-way from | $300 (Kiwi.com) |
Popular in | October |
Cheapest in | January |
Average price | $977 |
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 2,558,603 searches. Data last updated August 13, 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
PDX Portland - OPO Porto
PDXOPO
Portland
Mon 12/7
7:00 am-9:30 am
2 stops18h 30m
Porto
Fri 12/11
12:35 pm-9:40 am
2 stops29h 05m
$755
PortlandPorto
PDX Portland - OPO Porto
PDXOPO
Portland
Tue 11/24
11:31 am-10:00 pm
2 stops26h 29m
Porto
Wed 12/2
5:00 am-11:20 am
1 stop14h 20m
$767
Quickest round-trip
PortlandPorto
PDX Portland - OPO Porto
PDXOPO
Portland
Mon 9/28
7:10 am-10:30 am
1 stop19h 20m
Porto
Fri 10/9
5:00 am-11:10 am
1 stop14h 10m
$853
PortlandPorto
PDX Portland - OPO Porto
PDXOPO
Portland
Fri 10/16
7:00 am-10:30 am
1 stop19h 30m
Porto
Thu 10/29
10:00 am-8:50 pm
1 stop17h 50m
$890
PortlandPorto
PDX Portland - OPO Porto
PDXOPO
Portland
Fri 10/23
7:00 am-10:30 am
1 stop19h 30m
Porto
Mon 11/2
5:00 am-11:20 am
1 stop14h 20m
$893
Cheapest one-way
PortlandPorto
PDX Portland - OPO Porto
PDXOPO
Portland
Mon 10/5
3:30 pm-7:00 am
2 stops31h 30m
$462
Quickest one-way
PortlandPorto
PDX Portland - OPO Porto
PDXOPO
Portland
Wed 10/21
7:00 am-10:30 am
1 stop19h 30m
$463
PortlandPorto
PDX Portland - OPO Porto
PDXOPO
Portland
Mon 9/21
11:02 pm-6:15 am
2 stops23h 13m
$463
PortlandPorto
PDX Portland - OPO Porto
PDXOPO
Portland
Tue 10/6
1:05 pm-6:20 pm
1 stop21h 15m
$468
PortlandPorto
PDX Portland - OPO Porto
PDXOPO
Portland
Sat 9/26
10:33 pm-9:45 am
1 stop27h 12m
$478
Showing 1-10 of 11 resultsSorted by cheapest first
Compare providers for flights from Portland to Porto
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 Porto in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Portland-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-Porto flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Portland-Porto 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-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.
PDX-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.
Cheapflights Insights
Everything you need to know about your flight from Portland to Porto
What is the cheapest month to book a flight from Portland to Porto?
Currently, January is the cheapest month in which you can book a flight from Portland to Porto (average of $484). Flying from Portland to Porto in October is currently the most expensive (average of $1,205). 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.
How much does it cost to fly round-trip from Portland to Porto?
Airfare is below average for this route at the moment.
Portland to Porto flights typically cost between $874 and $1,099 in November.The cheapest round-trip price found within the last 5 days was $730 on Multiple Airlines (Nov 11-Nov 18).
Reviews of airlines servicing Porto
Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated August 13, 2026.
See what other customers who have flown with KLM,Delta, andUnited Airlines from Portland to Porto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.7
Overall
7.8
Crew
8.4
Entertainment
7.2
Food
7.3
Boarding
7.8
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
Comfort
7.7
Overall
7.8
Crew
8.4
Entertainment
7.2
Food
7.3
Boarding
7.8
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
Comfort
7.7
Overall
7.8
Crew
8.4
Entertainment
7.2
Food
7.3
Boarding
7.8
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
Comfort
7.7
Overall
7.8
Crew
8.4
Entertainment
7.2
Food
7.3
Boarding
7.8
Reviews
1 / 20
6.0
GoodAnonymous,Apr 2026
OKC - ATL
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
Browse thousands of different options on Cheapflights for your next trip
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Complete your trip
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Find flights from Portland to Porto, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Portland and Porto flights
Browse other Portland and Porto flight options. Last updated on August 13, 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 August 13, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Porto
Explore flights to Porto departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 13, 2026.
Top 3 airlines flying from Portland to Porto
Discover the top 3 airlines that operate flights from Portland to Porto. 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 August 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$494 | Average$1,080 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$498 | Average$902 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$502 | Average$1,187 | FlexibilityNo cancel fee | On-time69% |