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$368+ 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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — OPO
Jul 14 — Jul 211
Tue 7/14
Tue 7/21
1 adult, Economy
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Cheap 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 June 14, 2026.

This KLM deal was found by Cheapflights users on 6/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/31:05 pm
SAN
-
OPO
1 stop36h 00m
KLM
Wed 11/1111:15 am
OPO
-
SAN
1 stop32h 55m
KLM
Deal found 6/10$746
This KLM deal was found by Cheapflights users on 6/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/273:05 pm
SAN
-
OPO
1 stop24h 25m
KLM
Tue 11/35:00 am
OPO
-
SAN
1 stop15h 10m
KLM
Deal found 6/9$747
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Tue 11/37:10 am
SAN
-
OPO
1 stop18h 20m
United Airlines
Wed 11/116:00 am
OPO
-
SAN
2 stops23h 57m
United Airlines
Deal found 6/10$751
This United Airlines deal was found by Cheapflights users on 6/9. 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.
Sun 12/610:30 pm
SAN
-
OPO
2 stops27h 00m
United Airlines
Thu 12/106:00 am
OPO
-
SAN
2 stops23h 57m
United Airlines
Deal found 6/9$756
This Delta deal was found by Cheapflights users on 6/11. 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.
Tue 10/276:20 am
SAN
-
OPO
2 stops21h 10m
Delta
Tue 11/35:00 am
OPO
-
SAN
2 stops21h 27m
Delta
Deal found 6/11$757
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Mon 8/107:00 am
SAN
-
OPO
1 stop16h 00m
United Airlines
Wed 8/1911:20 am
OPO
-
SAN
2 stops37h 40m
United Airlines
Deal found 6/11$833
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 12/236:30 pm
SAN
-
OPO
2 stops36h 50m
United Airlines
Wed 1/66:00 am
OPO
-
SAN
2 stops36h 11m
United Airlines
Deal found 6/10$845
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Tue 9/157:00 am
SAN
-
OPO
1 stop16h 00m
United Airlines
Wed 9/3011:20 am
OPO
-
SAN
2 stops36h 29m
United Airlines
Deal found 6/12$866
This KLM deal was found by Cheapflights users on 6/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/157:20 am
SAN
-
OPO
1 stop19h 10m
KLM
Wed 9/3011:45 am
OPO
-
SAN
1 stop32h 05m
KLM
Deal found 6/11$870

Find 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 June 14, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$746
(KLM)

One-way from

$368
(United Airlines)

Popular in

May

Cheapest in

February

Average price

$1,102
Provider with most accurate pricing for San Diego-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Diego-Porto flights.
Search Deals
From San Diego to Porto
Search Deals
One-way flight from San Diego to Porto
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($130 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

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 June 14, 2026.
Use the filters below to find and compare flights from San Diego to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 10/27

3:05 pm-10:30 pm

1 stop24h 25m

Porto

Tue 11/3

5:00 am-12:10 pm

1 stop15h 10m

$747
Quickest round-trip

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 10/27

3:05 pm-3:25 pm

1 stop17h 20m

Porto

Tue 11/3

5:00 am-12:10 pm

1 stop15h 10m

$747

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sun 12/6

10:30 pm-9:30 am

2 stops27h 00m

Porto

Thu 12/10

6:00 am-9:57 pm

2 stops23h 57m

$756

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 9/15

7:00 am-7:00 am

1 stop16h 00m

Porto

Wed 9/30

11:20 am-3:49 pm

2 stops36h 29m

$866
Cheapest one-way

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sat 9/19

10:45 pm-6:55 am

1 stop24h 10m

$368

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sat 9/12

12:35 pm-7:00 am

2 stops58h 25m

$460

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sat 8/8

5:00 pm-7:00 am

2 stops54h 00m

$462

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 9/7

7:30 am-10:30 am

1 stop19h 00m

$463

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sat 7/25

10:30 pm-6:55 am

1 stop24h 25m

$463

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sun 9/6

5:15 pm-11:25 pm

1 stop22h 10m

$466

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

Compare providers for flights from San Diego to Porto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Diego to Porto in June.
ProviderPrice AccuracyTrust Score*
OvagoPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Diego-Porto flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on San Diego-Porto flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from San Diego-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Diego-Porto flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Diego-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, February is the cheapest month in which you can book a flight from San Diego to Porto (average of $585). Flying from San Diego to Porto in May is currently the most expensive (average of $1,342). 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.

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 June 14, 2026.
Peruse reviews from past customers who have flown with Delta,KLM, andUnited Airlines 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.
Delta
7.9
Good
8,405 reviews

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.2

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.9
Good
8,405 reviews
Delta
7.9
Good
8,405 reviews

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.2

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,529 reviews
Delta
7.9
Good
8,405 reviews

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.2

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
9,819 reviews
Delta
7.9
Good
8,405 reviews

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.2

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Lufthansa
6.8
Okay
8,057 reviews
Delta
7.9
Good
8,405 reviews

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.2

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 $747, KLM can have you in Porto from San Diego in 17h 20m. 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 KLM is currently your cheapest option to Porto, with prices starting at $585. Additional round-trip tickets that might be worth considering are offered by United Airlines and Delta, with the lowest prices starting at $590 and $596, respectively. You may be able to fly from San Diego to Porto for 39% 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, February is the cheapest month in which you can book a flight from San Diego to Porto (average of $585). Flying from San Diego to Porto in May is currently the most expensive (average of $1,342). 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
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from San Diego to Porto

Discover the top 4 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 June 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$585Average$1,061FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$590Average$917FlexibilityNo cancel feeOn-time69%
DeltaCheapest$596Average$1,050FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$708Average$1,342FlexibilityNo cancel feeOn-time76%

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