PDX - OPO

$255 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 4/14. 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
$535
Typical prices: $802-$951
KLM
Thu 4/9Wed 4/22
PDX - OPO • 1 stop
Cheapest one-way
$255
Typical prices: $474-$746
Multiple Airlines
Tue 4/14
PDX - OPO • 3 stops
Top airlines
KLM
Cheapest • from $535 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Portland and Porto. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
New York (JFK)
Cheapest • Avg $1,146 (round-trip)
Amsterdam (AMS)
Shortest trip • 14h 26m (one-way)
Insights
Insights
Insights
Insights
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 • 48% 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

Thu, Apr 9 - Wed, Apr 22
KLM Logo
1:05 pm - 10:15 pm
PDX
-
OPO
25h 10m
1 stop
KLM Logo
11:45 am - 11:10 am
OPO
-
PDX
31h 25m
1 stop
$535KLM
Thu, Apr 9 - Wed, Apr 22
KLM Logo
1:05 pm - 10:40 am
PDX
-
OPO
13h 35m
1 stop
KLM Logo
5:00 am - 5:10 pm
OPO
-
PDX
20h 10m
2 stops
$544KLM
Thu, Apr 9 - Sat, Apr 25
Delta Logo
1:05 pm - 10:40 am
PDX
-
OPO
13h 35m
1 stop
Delta Logo
11:45 am - 11:10 am
OPO
-
PDX
31h 25m
1 stop
$584Delta
Thu, Apr 9 - Sat, Apr 25
Multiple Airlines Logo
6:22 am - 8:20 pm
PDX
-
OPO
29h 58m
2 stops
Multiple Airlines Logo
4:40 pm - 5:40 pm
OPO
-
PDX
33h 00m
2 stops
$632Multiple Airlines
Tue, Mar 17 - Tue, Mar 31
United Airlines Logo
11:10 pm - 9:30 am
PDX
-
OPO
27h 20m
2 stops
United Airlines Logo
6:00 am - 6:34 pm
OPO
-
PDX
44h 34m
2 stops
$638United Airlines
Thu, Apr 9 - Wed, Apr 22
KLM Logo
1:05 pm - 7:15 pm
PDX
-
OPO
22h 10m
1 stop
KLM Logo
5:00 am - 4:07 pm
OPO
-
PDX
19h 07m
2 stops
$644KLM
Tue, Mar 17 - Tue, Mar 31
United Airlines Logo
2:05 pm - 9:30 am
PDX
-
OPO
36h 25m
2 stops
United Airlines Logo
6:00 am - 6:34 pm
OPO
-
PDX
44h 34m
2 stops
$649United Airlines
Thu, Apr 9 - Wed, May 6
Multiple Airlines Logo
1:05 pm - 7:15 pm
PDX
-
OPO
22h 10m
1 stop
Multiple Airlines Logo
5:55 am - 5:32 pm
OPO
-
PDX
19h 37m
2 stops
$651Multiple Airlines
Tue, Apr 28 - Mon, May 11
Iberia Logo
1:52 pm - 8:00 pm
PDX
-
OPO
22h 08m
2 stops
Iberia Logo
8:40 pm - 10:49 pm
OPO
-
PDX
34h 09m
2 stops
$657Iberia
Tue, Mar 3 - Fri, Mar 20
Delta Logo
7:00 am - 10:30 am
PDX
-
OPO
43h 30m
2 stops
Delta Logo
5:00 am - 12:25 pm
OPO
-
PDX
14h 25m
1 stop
$686Delta
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.

How much is a round-trip flight from Portland to Porto?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Portland to Porto departing in April.

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$255
Best time to beat the crowds with an average 49% drop in price.
Most popular time to fly with an average 28% 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 $255 for a one-way ticket and $535 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 8212 reviews
7.9Comfort
8.1Boarding
7.2Food
8.5Crew
7.8Entertainment
Airline reviews

Terrible. Four hour delay because Delta could not find crew to man the aircraft. Terrible communication. Terrible insight into the delays. One of the worst flight experiences I’ve had.

2.0 MediocreDonna, Feb 2026
DEN - LGA
Read more Delta reviews

Terrible. Four hour delay because Delta could not find crew to man the aircraft. Terrible communication. Terrible insight into the delays. One of the worst flight experiences I’ve had.

It was good. The leg room was not great in Row 1.

The landing was the worst I’ve experienced with a flight.

The crew, and fellow passengers, were super gracious and kind. There seemed to be plenty of bin space even though the plane was full. It’s nice to get a glass of wine with dinner in Premiere seating, and there was a lot of food.

First flight out and was 85 minutes delayed. Notification came out way too late

Delta flights recently are always delayed AND at jfk tney get the gates further away (need To walk 20’ to get to them/all the way at the end of the terminal). Not sure whats happening but price doesnt match experience!

Everything I mentioned earlier - the airbus was more comfortable indeed and the experience was further enhanced.

Delta continues to set the benchmark for traveler-friendly service with minimal disruption and clear communication within the mainland US (coast to coast). I am consistently pleased to be a Delta customer, and this experience once again met my expectations. There was a brief delay departing from MIA due to a technical issue that required the aircraft to return to the gate. However, the situation was handled professionally and transparently. Fortunately, my planned layover allowed ample buffer time, so the adjustment caused no stress. Overall, another smooth and reassuring experience.

Good experience and the flight landed early. There was no food I had or entertainment.

Flight was delayed and no reasons provided. After the passengers were boarded, the crew made announcement that the captain has jot arrived and he would take another 15 mins. All passengers patiently sat until the captain came and started. Terrible experience!

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.

it was a very short flight so my expectations were low.

As great a red-eye flight as red-eye flights can be.

Once boarding started it was pretty quick. Food was inedible; cold and salty..

Entertainment kept turning itself off. Gave up on watching a movie.

Both the WIFI and entertainment did not work for 2.5h

The crew made our experience extremely bad. They were rude and didn’t have anything for kids.

Very old flight - time to retire it for newer airplanes

2+ hours delayed Outlet in row 12 did not work Tv monitors did not work Lights kept off the entire flight for at 5pm-7pm flight

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Do not like the size of the overhead bin. I think staff should monitor the size of suitcases that are being carried on by passengers to ensure they meet the size requirement.

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

Information on your arrival and departure airports