HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$468+ Cheap flights from San Diego (SAN) 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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — OPO
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Diego 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 San Diego to Porto

Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) 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 14, 2025.

Round-trip from

$658
(Lufthansa)

One-way from

$468
(Trip.com)

Popular in

June

Cheapest in

February

Average price

$1,025
From San Diego to Porto
Search Deals
One-way flight from San Diego to Porto
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($296 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($56 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from San Diego to Porto

Cheapest flights from San Diego to Porto
Explore the most affordable flight options available from San Diego to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Lufthansa deal was found by Cheapflights users on 8/14. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/35:35 pmSAN - OPO
1 stop22h 05mLufthansa
Sun 12/76:15 amOPO - SAN
1 stop17h 30mLufthansa
Deal found 8/14$658
This SWISS deal was found by Cheapflights users on 8/13. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/34:08 pmSAN - OPO
2 stops35h 42mSWISS
Sun 12/712:05 pmOPO - SAN
2 stops40h 43mSWISS
Deal found 8/13$667
This Mytrip deal was found by Cheapflights users on 8/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/228:10 amSAN - OPO
2 stops22h 55mMultiple Airlines
Tue 10/710:50 pmOPO - SAN
2 stops24h 35mMultiple Airlines
Deal found 8/14$684
This AirNGo deal was found by Cheapflights users on 8/14. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/228:10 amSAN - OPO
1 stop17h 25mAir Canada
Tue 10/78:40 amOPO - SAN
2 stops39h 11mAir Canada
Deal found 8/14$714
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Thu 12/257:55 pmSAN - OPO
3 stops31h 45mUnited Airlines
Mon 1/512:30 pmOPO - SAN
2 stops37h 19mUnited Airlines
Deal found 8/13$767
This CheapOair deal was found by Cheapflights users on 8/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/111:08 amSAN - OPO
2 stops20h 37mMultiple Airlines
Fri 10/108:40 amOPO - SAN
2 stops39h 11mMultiple Airlines
Deal found 8/14$773
This oojo deal was found by Cheapflights users on 8/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/301:59 pmSAN - OPO
2 stops37h 26mSWISS
Mon 10/137:20 pmOPO - SAN
2 stops35h 07mSWISS
Deal found 8/13$777
This Gurufare deal was found by Cheapflights users on 8/13. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/301:59 pmSAN - OPO
2 stops33h 46mMultiple Airlines
Mon 10/1311:05 amOPO - SAN
1 stop36h 20mMultiple Airlines
Deal found 8/13$796

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Diego 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 14, 2025.
Use the filters below to find and compare flights from San Diego to Porto that are best for you.

Fly from

San Diego

Fly to

Porto

Route

Depart

Return

Price

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Wed 12/3

5:35 pm-11:45 pm

1 stop22h 10m

Porto

Sun 12/7

6:15 am-3:45 pm

1 stop17h 30m

$658

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Wed 12/3

1:05 pm-11:50 am

2 stops38h 45m

Porto

Sun 12/7

7:25 pm-8:48 pm

2 stops33h 23m

$667

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 9/22

8:10 am-3:05 pm

2 stops22h 55m

Porto

Tue 10/7

10:50 pm-3:25 pm

2 stops24h 35m

$684

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 9/22

8:10 am-9:35 am

1 stop17h 25m

Porto

Tue 10/7

8:40 am-3:51 pm

2 stops39h 11m

$714

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Thu 9/4

8:25 am-11:35 am

2 stops19h 10m

$468

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 9/22

9:59 am-11:00 am

2 stops41h 01m

$486

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 9/22

9:35 pm-11:40 am

2 stops30h 05m

$501

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 9/22

8:10 am-9:35 am

1 stop17h 25m

$578

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 9/22

8:10 am-9:35 am

1 stop17h 25m

$578

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Thu 9/4

5:15 pm-11:20 pm

1 stop22h 05m

$877

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 11 results
1
2

Best time to book a flight from San Diego to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from San Diego with our price prediction graph.
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 San Diego to Porto

What is the cheapest month to book a flight from San Diego to Porto?

Currently, January is the cheapest month in which you can book a flight from San Diego to Porto (average of $523). Flying from San Diego to Porto in June is currently the most expensive (average of $1,029). 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.

What is the cheapest time of day to fly from SAN to OPO?

Find hourly flight availability from San Diego to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

It’s optimal to fly from San Diego to Porto in the afternoon. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight in the morning.

How much does it cost to fly round-trip from San Diego to Porto?

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 14, 2025.
Peruse reviews from past customers who have flown with KLM, United Airlines, and Lufthansa from San Diego to Porto to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,381 reviews

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,381 reviews
KLM
7.8
Good
1,381 reviews

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,916 reviews
KLM
7.8
Good
1,381 reviews

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Lufthansa
6.8
Okay
7,317 reviews
KLM
7.8
Good
1,381 reviews

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.3

Overall

7.8

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

Find useful and relevant information for your journey from San Diego to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from San Diego to Porto round-trip?

    Flying on United Airlines is currently your cheapest option to Porto, with prices starting at $615. Additional round-trip tickets that might be worth considering are offered by Lufthansa and KLM, with the lowest prices starting at $645 and $648, respectively. You may be able to fly from San Diego to Porto for 43% less than the average price by searching for these airlines.

  • Can I find deals for flights from San Diego to Porto that include hotel bookings?

    Yes. In addition to deals on San Diego to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Diego to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Diego to Porto.

  • Can I find deals for business class flights from San Diego to Porto?

    Yes. Cheapflights offers flight deals from San Diego to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, January is the cheapest month in which you can book a flight from San Diego to Porto (average of $523). Flying from San Diego to Porto in June is currently the most expensive (average of $1,029). 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.

See more FAQs

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Arcos de Valdevez
Coimbra

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Diego to Porto

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Lisbon flights
Los Angeles to Lisbon flights
Los Angeles to Porto flights
San Diego to Lisbon flights
San Francisco to Porto flights
Santa Ana to Lisbon flights
San Jose to Lisbon flights
Ontario to Lisbon flights
Sacramento to Lisbon flights
San Francisco to Funchal flights
Los Angeles to Funchal flights
San Francisco to Faro flights
Las Vegas to Lisbon flights
Ontario to Porto flights
Oakland to Lisbon flights
San Francisco to Lajes flights
San Francisco to Ponta Delgada flights
Santa Rosa to Lisbon flights
Long Beach to Lisbon flights
Reno to Lisbon flights
Los Angeles to Faro flights
San Jose to Funchal flights
Burbank to Lisbon flights
Los Angeles to Ponta Delgada flights
San Jose to Faro flights
San Jose to Porto flights
San Diego to Ponta Delgada flights
San Diego to Faro flights
Sacramento to Porto flights
Fresno to Lisbon flights
Ontario to Faro flights
Burbank to Porto flights
Santa Ana to Porto flights
Oakland to Porto flights
Santa Ana to Faro flights
Los Angeles to Lajes flights
Palm Springs to Lisbon flights
San Francisco to Velas flights
Las Vegas to Faro flights
San Jose to Ponta Delgada flights
Monterey to Lisbon flights
San Francisco to Horta flights
Sacramento to Lajes flights
Las Vegas to Funchal flights
Ontario to Ponta Delgada flights
Long Beach to Faro flights
San Francisco to Porto Santo flights
Santa Barbara to Lisbon flights

Top 3 airlines flying from San Diego to Porto

Discover the top 3 airlines that operate flights from San Diego 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 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$615Average$1,221FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$645Average$1,173FlexibilityNo cancel feeOn-time76%
KLMCheapest$648Average$860FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.