PDX - OPO

$320 Find Cheap Flights from Portland to Porto

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Portland to Porto departing on 4/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Porto

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Portland to Porto, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Portland to Porto, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$486
Overall average: $1,055
Delta
Mon 3/9Tue 3/17
PDX - OPO • 1 stop
Cheapest one-way
$320
Typical prices: $474-$746
Multiple Airlines
Thu 4/9
PDX - OPO • 2 stops
Top airlines
Delta
Cheapest • from $486 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 68% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 49% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Porto!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Portland to Porto (PDX-OPO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portland to Porto that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Portland to Porto

Mon, Mar 9 - Tue, Mar 17
Delta Logo
2:25 pm - 10:25 pm
PDX
-
OPO
25h 00m
1 stop
Delta Logo
11:15 am - 12:25 pm
OPO
-
PDX
32h 10m
1 stop
$486Delta
Sun, Mar 8 - Tue, Mar 17
Delta Logo
10:30 pm - 3:25 pm
PDX
-
OPO
33h 55m
2 stops
Delta Logo
11:15 am - 12:25 pm
OPO
-
PDX
32h 10m
1 stop
$490Delta
Sun, Mar 8 - Tue, Mar 17
United Airlines Logo
11:59 pm - 9:30 am
PDX
-
OPO
26h 31m
2 stops
United Airlines Logo
6:00 am - 12:35 am
OPO
-
PDX
25h 35m
2 stops
$492United Airlines
Sat, Apr 18 - Tue, Apr 28
Multiple Airlines Logo
7:05 pm - 11:25 pm
PDX
-
OPO
44h 20m
2 stops
Multiple Airlines Logo
6:20 am - 12:44 am
OPO
-
PDX
26h 24m
2 stops
$493Multiple Airlines
Sat, Mar 7 - Sat, Mar 14
Lufthansa Logo
3:45 pm - 11:40 pm
PDX
-
OPO
23h 55m
2 stops
Lufthansa Logo
6:15 am - 12:35 am
OPO
-
PDX
25h 20m
2 stops
$497Lufthansa
Tue, Mar 10 - Mon, Mar 16
SWISS Logo
1:39 pm - 11:15 am
PDX
-
OPO
38h 36m
2 stops
SWISS Logo
12:05 pm - 11:04 pm
OPO
-
PDX
41h 59m
2 stops
$499SWISS
Tue, Apr 7 - Tue, Apr 21
Multiple Airlines Logo
3:15 pm - 3:40 pm
PDX
-
OPO
40h 25m
2 stops
Multiple Airlines Logo
8:40 am - 10:29 pm
OPO
-
PDX
21h 49m
2 stops
$505Multiple Airlines
Sun, Apr 12 - Fri, Apr 24
United Airlines Logo
11:59 pm - 11:15 am
PDX
-
OPO
27h 16m
2 stops
United Airlines Logo
6:00 am - 12:44 am
OPO
-
PDX
26h 44m
2 stops
$508United Airlines
Sun, Apr 12 - Fri, Apr 24
United Airlines Logo
11:59 pm - 3:40 pm
PDX
-
OPO
31h 41m
2 stops
United Airlines Logo
12:35 pm - 11:44 am
OPO
-
PDX
31h 09m
3 stops
$521United Airlines
Sat, Mar 7 - Sat, Mar 14
Lufthansa Logo
7:30 am - 11:40 pm
PDX
-
OPO
32h 10m
2 stops
Lufthansa Logo
6:15 am - 12:35 am
OPO
-
PDX
25h 20m
2 stops
$528Lufthansa
Booking Insights

KAYAK's insights & trends for Portland to Porto flights

Get data-powered insights and trends into flights from Portland to Porto to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Portland to Porto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Portland to Porto, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Portland to Porto is January, where tickets cost $484 (return) on average. On the other hand, the most expensive months are May and June, where the average cost of round-trip tickets is $1,301 and $1,224 respectively.

How far in advance should I book a flight from Portland to Porto?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Portland to Porto, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Portland to Porto, you should book around 4 weeks before departure, which saves you about 68% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$320
Best time to beat the crowds with an average 49% drop in price.
Most popular time to fly with an average 27% increase in price.
Flight from Portland to Porto

When to book flights from Portland to Porto

Are your dates flexible? Find out the best times to travel from Portland to Porto based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Portland to Porto

  • What is the cheapest flight from Portland to Porto?

    In the last 3 days, the lowest price for a flight from Portland to Porto was $320 for a one-way ticket and $486 for a round-trip.

  • Do I need a passport to fly between Portland and Porto?

    A passport is required to fly from Portland to Porto.

  • Which airports will I be using when flying from Portland to Porto?

    On your way to Porto, you’ll fly out from Portland. You’ll be landing at Porto.

  • Which aircraft models fly most regularly from Portland to Porto?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Portland to Porto?

    Star Alliance, and SkyTeam are the airline alliances operating flights between Portland and Porto, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Portland to Porto, Delta or KLM?

    The two airlines most popular with KAYAK users for flights from Portland to Porto are Delta and KLM. With an average price for the route of $1,025 and an overall rating of 7.9, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $891 and an overall rating of 7.7.

  • How does KAYAK find such low prices on flights from Portland to Porto?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Portland to Porto.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Portland to Porto?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Portland is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Portland to Porto?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Porto with an airline and back to Portland with another airline. Booking your flights between Portland and OPO can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Portland to Porto?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Porto from Portland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Portland to Porto

 
See real verified KAYAK customer reviews for airlines flying from Portland to Porto. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Portland to Porto? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8174 reviews
8.5Crew
7.2Food
8.1Boarding
7.8Entertainment
7.9Comfort
Airline reviews

Only freetext wifi was available in flight; browsing WiFi required payment. Since the seats had no in flight entertainment, Delta should revisit this policy on this longer flight.

6.0 GoodEmily, Feb 2026
ATL - DAL
Read more Delta reviews

Only freetext wifi was available in flight; browsing WiFi required payment. Since the seats had no in flight entertainment, Delta should revisit this policy on this longer flight.

Only water, tea or coffee served midflight, even to comfort seating. Man next to me needed two seats and took up a portion of my seat and Delta did nothing.

The flight was great as well as the airline staff

First class and monitors weren’t working for mine & my husbands. Eventually fixed, but quite annoyed as we bought first class. Also, No foot rests.

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

It was delayed but other than that it was great.

Got on the plane and sat there for an hour before departure.

Second flight in a row where the entertainment system is broken. 5 hour long flight with no entertainment and flight attendants did not seem interested in resolving the matter. Very shocked to be treated this poorly considering I paid for a first class experience and have Diamond Medallion status.

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

It was nt delta. It was aeromexo. Service was awful. They served a very small drink and NO snack for a 3hr and 35min flight. Then for the first 30 min of the flight is was talk and talk over head interruption the movie/ show i picked to watch.

Empty seats next to me - wish it had been for a longer flight!!

I’m grateful for the KLM Air France shuttle bus service to Ottawa. However due to construction and other issues related to the chaotic Uber pickup system at YUL, it’s a challenge to find the Kelios bus service to Ottawa. The signs are not clear or even available. No staff to guide passengers. It’s a stressful experience.

Flight was on time, staff are friendly and helpful onboard.

Terrible last row seats many seats available but no offer to move to better seat

Delay on my previous leg, had to run to catch my flight. But that happens. Overall ok.

Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

Couldn’t get boarding pass in SLC even with help from a redcoat, so had to find a desk in AMS to get boarding pass. Technical problems so not sure why. Very inconvenient. The KLM app is not as user friendly as most apps. Also had to wait almost an hour on the tarmac for a fuel truck, which caused us to miss a connecting bus in LUX.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

Terrible. Our first time back on United for 10 years, the seats in Polaris class are small and uncomfortable. They have squished too many people in to get more $$$. The staff are not friendly and not wanting to accommodate. I asked for two salads rather than a main meal and was advised no we wont do that. Then asked what I would like for breakfast and given something else anyway. I will not be flying United International anytime soon.

Same thing as flight from Pheonix to Newark. Uograded and Promised extra leg room and when I got to the seat it had none.

I upgraded my seat and was promised it would be next to the emergency door for extra leg room and they said it was premium plus but it was at the back of the plane...same thing happened from Newark to Dubai

Everything except the food and entertainment. It was a great experience though

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

United Airlines is my preferred airlines and I am thankful for Gary who also help support me on the phone to switch my flight literally last min.

Not being stranded in Chicago for her airport to 11:30 tomorrow morning the 3rd

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

The attendant on board was amazing. She should be doing business/first international long haul.

Everything you need to know for your flight from Portland to Porto

Information on your arrival and departure airports