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$298+ 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 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — OPO
oct. 17 — oct. 241
vie. 10/17
vie. 10/24
1 adult, Economy
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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 septiembre 17, 2025.

Round-trip from

$629
(Lufthansa)

One-way from

$298
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$1,040
From San Diego to Porto
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One-way flight from San Diego to Porto
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 septiembre 17, 2025.

This United Airlines deal was found by Cheapflights users on 9/16. 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.
dom. 12/2810:45 pmSAN - OPO
2 stops32h 10mUnited Airlines
vie. 1/96:00 amOPO - SAN
2 stops35h 40mUnited Airlines
Deal found 9/16$587
This United Airlines deal was found by Cheapflights users on 9/16. 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.
lun. 12/294:45 pmSAN - OPO
2 stops34h 55mUnited Airlines
vie. 1/96:00 amOPO - SAN
2 stops35h 40mUnited Airlines
Deal found 9/16$593
This United Airlines deal was found by Cheapflights users on 9/16. 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.
lun. 12/2910:25 amSAN - OPO
2 stops20h 30mUnited Airlines
jue. 1/86:00 amOPO - SAN
2 stops41h 33mUnited Airlines
Deal found 9/16$606
This Lufthansa deal was found by Cheapflights users on 9/16. 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.
mié. 12/35:35 pmSAN - OPO
1 stop22h 05mLufthansa
dom. 12/76:15 amOPO - SAN
1 stop17h 30mLufthansa
Deal found 9/16$629
This United Airlines deal was found by Cheapflights users on 9/16. 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.
dom. 12/2810:45 pmSAN - OPO
2 stops32h 10mUnited Airlines
jue. 1/86:00 amOPO - SAN
2 stops35h 40mUnited Airlines
Deal found 9/16$632
This SWISS deal was found by Cheapflights users on 9/16. 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.
mié. 12/34:08 pmSAN - OPO
2 stops35h 02mSWISS
dom. 12/712:05 pmOPO - SAN
2 stops40h 43mSWISS
Deal found 9/16$637
This United Airlines deal was found by Cheapflights users on 9/16. 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.
lun. 12/294:45 pmSAN - OPO
2 stops34h 55mUnited Airlines
mié. 1/76:00 amOPO - SAN
2 stops35h 40mUnited Airlines
Deal found 9/16$638
This Delta deal was found by Cheapflights users on 9/16. 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.
mar. 12/306:15 amSAN - OPO
2 stops20h 15mDelta
vie. 1/96:30 amOPO - SAN
2 stops25h 25mDelta
Deal found 9/16$641
This United deal was found by Cheapflights users on 9/16. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/296:15 amSAN - OPO
2 stops24h 40mMultiple Airlines
jue. 1/82:05 pmOPO - SAN
1 stop33h 40mMultiple Airlines
Deal found 9/16$656
This KAYAK deal was found by Cheapflights users on 9/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/285:35 pmSAN - OPO
2 stops34h 05mLufthansa
mié. 1/71:45 pmOPO - SAN
1 stop34h 00mLufthansa
Deal found 9/16$671
This Delta deal was found by Cheapflights users on 9/16. 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.
vie. 10/317:25 amSAN - OPO
2 stops25h 00mDelta
vie. 11/711:20 amOPO - SAN
2 stops19h 46mDelta
Deal found 9/16$673

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 septiembre 17, 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

mar. 3/10

12:15 pm-9:30 am

1 stop14h 15m

Porto

mar. 3/17

6:00 am-11:38 am

2 stops36h 38m

$556

San DiegoPorto

SAN - OPO

SANOPO

San Diego

mar. 3/10

7:10 am-9:30 am

1 stop19h 20m

Porto

mar. 3/17

1:45 pm-4:45 pm

1 stop34h 00m

$562

San DiegoPorto

SAN - OPO

SANOPO

San Diego

lun. 12/29

4:45 pm-11:40 am

2 stops34h 55m

Porto

vie. 1/9

6:00 am-9:40 am

2 stops35h 40m

$593

San DiegoPorto

SAN - OPO

SANOPO

San Diego

vie. 10/31

6:35 pm-11:40 pm

1 stop22h 05m

Porto

vie. 11/7

6:15 am-3:45 pm

1 stop17h 30m

$629

San DiegoPorto

SAN - OPO

SANOPO

San Diego

mié. 12/3

5:35 pm-11:40 pm

1 stop22h 05m

Porto

dom. 12/7

6:15 am-3:45 pm

1 stop17h 30m

$629

San DiegoPorto

SAN - OPO

SANOPO

San Diego

dom. 12/28

10:45 pm-2:55 pm

2 stops32h 10m

Porto

mié. 1/7

6:00 am-9:40 am

2 stops35h 40m

$632

San DiegoPorto

SAN - OPO

SANOPO

San Diego

mié. 12/3

4:08 pm-11:10 am

2 stops35h 02m

Porto

dom. 12/7

12:05 pm-10:30 pm

2 stops42h 25m

$637

San DiegoPorto

SAN - OPO

SANOPO

San Diego

mar. 12/30

6:15 am-10:30 am

2 stops20h 15m

Porto

vie. 1/9

6:30 am-11:55 pm

2 stops25h 25m

$641

San DiegoPorto

SAN - OPO

SANOPO

San Diego

sáb. 11/15

10:57 am-6:50 am

3 stops35h 53m

$298

San DiegoPorto

SAN - OPO

SANOPO

San Diego

mié. 10/15

2:11 pm-3:20 pm

3 stops41h 09m

$352

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 15 results
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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 $1,028). 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 septiembre 17, 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 septiembre 17, 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
1,386 reviews

Comfort

7.7

Entertainment

7.2

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
KLM
7.8
Good
1,386 reviews
KLM
7.8
Good
1,386 reviews

Comfort

7.7

Entertainment

7.2

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
United Airlines
7.4
Good
8,926 reviews
KLM
7.8
Good
1,386 reviews

Comfort

7.7

Entertainment

7.2

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
Lufthansa
6.8
Okay
7,409 reviews
KLM
7.8
Good
1,386 reviews

Comfort

7.7

Entertainment

7.2

Food

7.3

Boarding

7.8

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

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.

  • How long is the flight from San Diego to Porto?

    For as low as $556, United Airlines can have you in Porto from San Diego in 14h 15m. The distance between San Diego and Porto is about 5596 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 KLM and Lufthansa, with the lowest prices starting at $648 and $650, respectively. You may be able to fly from San Diego to Porto for 41% 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 $1,028). 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

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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 septiembre 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$615Average$1,221FlexibilityNo cancel feeOn-time69%
KLMCheapest$648Average$754FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$650Average$1,173FlexibilityNo cancel feeOn-time76%

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