SAN - OPO

$523 Find Cheap Flights from San Diego 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 San Diego to Porto departing on 9/22. 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

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 San Diego 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 San Diego to Porto, as well as popular online travel agencies
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Flight Deals

Cheap Flights from San Diego to Porto (SAN-OPO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Diego 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 San Diego to Porto

Tue, Mar 10 - Tue, Mar 17
United Airlines Logo
12:15 pm - 9:30 amSAN-OPO
14h 15m1 stop
United Airlines Logo
6:00 am - 11:38 amOPO-SAN
36h 38m2 stops
$556United Airlines
Find Deal
Tue, Mar 10 - Tue, Mar 17
Multiple Airlines Logo
10:51 am - 9:30 amSAN-OPO
15h 39m2 stops
Multiple Airlines Logo
6:00 am - 8:16 pmOPO-SAN
21h 16m2 stops
$560Multiple Airlines
Find Deal
Tue, Mar 10 - Tue, Mar 17
Multiple Airlines Logo
7:10 am - 9:30 amSAN-OPO
19h 20m1 stop
Multiple Airlines Logo
1:45 pm - 4:45 pmOPO-SAN
34h 00m1 stop
$562Multiple Airlines
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Wed, Dec 3 - Sun, Dec 7
Lufthansa Logo
5:35 pm - 11:40 pmSAN-OPO
22h 05m1 stop
Lufthansa Logo
6:15 am - 3:45 pmOPO-SAN
17h 30m1 stop
$629Lufthansa
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Wed, Dec 3 - Sun, Dec 7
SWISS Logo
1:05 pm - 11:10 amSAN-OPO
38h 05m2 stops
SWISS Logo
7:25 pm - 8:48 pmOPO-SAN
33h 23m2 stops
$637SWISS
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Wed, Oct 22 - Sun, Nov 2
Lufthansa Logo
5:15 pm - 11:20 pmSAN-OPO
22h 05m1 stop
Lufthansa Logo
5:15 am - 12:13 amOPO-SAN
25h 58m2 stops
$639Lufthansa
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Wed, Oct 22 - Sun, Nov 2
Multiple Airlines Logo
4:07 pm - 6:30 pmSAN-OPO
18h 23m2 stops
Multiple Airlines Logo
5:15 am - 12:13 amOPO-SAN
25h 58m2 stops
$641Multiple Airlines
Find Deal
Sun, Oct 12 - Sun, Oct 19
Delta Logo
10:00 am - 3:30 pmSAN-OPO
21h 30m2 stops
Delta Logo
5:00 am - 12:00 pmOPO-SAN
15h 00m1 stop
$806Delta
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Tue, Sep 30 - Sat, Oct 18
KLM Logo
1:55 pm - 10:15 pmSAN-OPO
24h 20m1 stop
KLM Logo
7:00 pm - 12:00 pmOPO-SAN
25h 00m1 stop
$832KLM
Find Deal
Tue, Sep 30 - Sat, Oct 18
KLM Logo
2:00 pm - 3:35 pmSAN-OPO
17h 35m2 stops
KLM Logo
7:00 pm - 12:00 pmOPO-SAN
25h 00m1 stop
$837KLM
Find Deal

Everything you should know

Top airlines
United Airlines
Cheapest • from $556 (round-trip)
KLM
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
February
Cheapest • 38% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$556
Typical prices: $770-998
United Airlines
Tue 3/10Tue 3/17
SAN - OPO • 1 stop
Cheapest one-way
$523
United Airlines
Mon 9/22
SAN - OPO • 1 stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Porto!
Booking Insights

KAYAK's insights & trends for San Diego to Porto flights

Get data-powered insights and trends into flights from San Diego 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 San Diego to Porto?

What is the cheapest month to fly from San Diego to Porto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Diego 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 San Diego to Porto is February, where tickets cost $648 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $1,338 and $1,312 respectively.

Good to know

Low seasonApril
Cheapest flight$523
Best time to beat the crowds but there is an average 13% increase in price.
Most popular time to fly with an average 28% increase in price.
Flight from San Diego to Porto

When to book flights from San Diego to Porto

Are your dates flexible? Find out the best times to travel from San Diego 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 San Diego to Porto

  • What is the cheapest flight from San Diego to Porto?

    In the last 3 days, the lowest price for a flight from San Diego to Porto was $523 for a one-way ticket and $556 for a round-trip.

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

    Yes, you'll most likely have to show a valid passport before boarding the plane in San Diego and on arrival in Porto.

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

    San Diego and Porto are both served by 1 main airport. You will leave San Diego from San Diego and will be arriving at Porto.

  • Which aircraft models fly most regularly from San Diego to Porto?

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

  • Which airline alliances offer flights from San Diego to Porto?

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

  • Which is the best airline for flights from San Diego to Porto, KLM or United Airlines?

    The two airlines most popular with KAYAK users for flights from San Diego to Porto are KLM and United Airlines. With an average price for the route of $754 and an overall rating of 7.8, KLM is the most popular choice. United Airlines is also a great choice for the route, with an average price of $1,221 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from San Diego 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 San Diego to Porto.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from San Diego 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 San Diego 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 San Diego with another airline. Booking your flights between San Diego 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 San Diego 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 San Diego 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 San Diego to Porto

 
See real verified KAYAK customer reviews for airlines flying from San Diego 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 San Diego 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.
7.8
KLMOverall score based on 1385 reviews
7.8Boarding
8.4Crew
7.3Food
7.7Comfort
7.2Entertainment
Airline reviews

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.

2.0 MediocrePeter, Aug 2025SAN - AMS
Read more KLM reviews

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.

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

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.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

From the first moment you interact with United Airlines, you can expect nothing less but extreme frustration. The baggage handler at the bag drop seems completely unbothered by the presence of customers waiting in line. No help was extended to load the baggage whatsoever. And if any of your bags is overweight by 0.01 pound they will make you re-distribute everything in your suitcase just to play power trip. When it was time to board no help was extended to customers to locate their seats. Moreover. It was a chaotic mess at the gate when it was unclear who should board first and everyone just bunched up, trying to get on the plane. I am sure the crew was doing their best to perform their jobs while being paid their wages however it shouldn’t be that hard to smile once or twice when you’re in the business if serving customers. It is a shame for the United States of America to have a flagship carrier of such low caliber. Our flight was also delayed by about an hour and a half due to further delays prior to our inbound flight. Being someone who has travelled for both business and leisure in Asia, Europe, and South America I have never experienced such poor quality of service.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

The pilots were late and it made us 1 hour late. The meat was tough and bok choy was also tough.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

The best airline I have ever travel , really good customer service, attention and service !!

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

Not a great experience. We paid for the upgrade for premium economy seats and seated ourselves in very comfortable seats. Someone came along with the same seat on their boarding pass. The aircraft had been changed and as a result we were booted out and sent further back to small uncomfortable seats. After complaining we were moved to emergency row seats, which gave us more leg room but the seats don’t recline. For people in our 70’s we found having to sit upright from California to NJ very uncomfortable. Not sure why they chose to move senior citizens instead of the two people that were allowed to take the more comfortable seats. Not happy.

Everything was great. Only thing that could’ve made it better was buy on board options for hot food, but the snacks were decent. The flight attendants were great. I had no complaints. I was able to make it to my destination safely

The food could be better, more snacks. And have some plugs to chargue the phone.

Everything was really great just The aircraft was too old and sounded it will break during takeoff

Extremely pleased with the crew. Best flight attendants ever! Very friendly, genuinely caring and attentive.

Best flight attendants ever! Very customer and service oriented, courteous, professional and helpful.

Cheapest airlines I have ever been on. I got downgraded and never got on united. I got rerouted through Vancouver onto jetwesf

Very small and uncomfortable seats, Hard to hear entertainment system sound. Horrible food. Staff doesn't care much about the passengers. 2nd time they didn't give me my vegetarian meal. They asked me regular food with meat. The airline and staff was from United airlines.

Checkin took along timen only.few angents available at.checkin desk. Customer support over phone no existence

At baggage claim, I was given the wrong printed ticket. The ticket belonged to another passenger for a different flight — to Zurich instead of Frankfurt (layover). I was even allowed to pass security, and when I asked the Lufthansa employee if I was on the correct flight, and why it was changed. The employee said everything was correct and I should board. When I got on the plane, there was someone in my seat, and the crew on the plane finally realized that I was on the wrong plane. When I got off the plane, nobody was willing to help, and the security refused to provide my original printed ticket. That was until I showed them that I took a photo of the ticket; once they realized I had photographic evidence, they were suddenly ready to help me. The Lufthansa employee began communicating with other airlines and found a flight that would take me to my destination via Polish Airlines. I was required to once again go through security, re-check my bag, and once again pay for my checked bag and weight overage fees. This experience was incredibly stressful and very frustrating, as you can imagine. A Lufthansa employee told me I would be eligible for a refund. Please tell me what steps I need to take in order to make that happen. Thank you!

Good service … bus transfer upon arrival from plane to terminal: atrocious!!!

helpful and friendly. The Lufthanza people I dealt with before my holiday were so unhelpful by comparison.

Everything you need to know for your flight from San Diego to Porto

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