How long is the flight from San Diego to Porto?

For as low as $484, KLM can have you in Porto from San Diego in 17h 25m. 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. Another option worth looking into is Lufthansa, starting at $650 round trip. You may be able to fly from San Diego to Porto for 36% less than the average price by searching for these airlines.

In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.

If weather is an important factor for your trip to Porto, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

Most accurate provider : When it comes to deals on San Diego-Porto flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Diego-Porto flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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.

$467+ Flights from San Diego to Porto

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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 December 15, 2025.

Mon 12/2212:40 pmSAN - OPO

2 stops62h 35mMultiple Airlines

Sun 12/286:15 amOPO - SAN

1 stop17h 30mMultiple Airlines

Deal found 12/14

$1,975

Best flights from San Diego to Porto
Discover carefully curated flight deals from San Diego to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 15, 2025.

Tue 3/103:00 pmSAN - OPO

1 stop17h 25mKLM

Fri 3/204:10 pmOPO - SAN

1 stop27h 55mKLM

Deal found 12/13

$484

Sat 1/171:35 pmSAN - OPO

2 stops36h 55mDelta

Sun 2/15:00 amOPO - SAN

2 stops27h 05mDelta

Deal found 12/14

$485

Sat 1/176:00 pmSAN - OPO

1 stop17h 15mBritish Airways

Sun 2/18:20 amOPO - SAN

2 stops22h 06mBritish Airways

Deal found 12/14

$489

Fri 1/309:55 amSAN - OPO

2 stops18h 55mMultiple Airlines

Fri 2/612:50 pmOPO - SAN

2 stops39h 59mMultiple Airlines

Deal found 12/14

$496

Sat 1/176:00 pmSAN - OPO

1 stop17h 15mMultiple Airlines

Sun 2/18:20 amOPO - SAN

2 stops22h 06mMultiple Airlines

Deal found 12/13

$498

Last-minute flights from San Diego to Porto
Discover last-minute flight deals from San Diego to Porto. Data last updated December 15, 2025 and is based on user searches.

Thu 1/87:05 amSAN - OPO

2 stops19h 20mDelta

Wed 1/146:00 amOPO - SAN

2 stops22h 50mDelta

Deal found 12/13

$693

Sat 1/1710:52 amSAN - OPO

2 stops17h 13mMultiple Airlines

Sun 2/16:00 amOPO - SAN

2 stops22h 47mMultiple Airlines

Deal found 12/14

$467

Sat 1/171:35 pmSAN - OPO

2 stops36h 55mDelta

Sun 2/111:15 amOPO - SAN

2 stops38h 53mDelta

Deal found 12/13

$485

Sat 1/176:00 pmSAN - OPO

1 stop17h 15mBritish Airways

Sun 2/18:20 amOPO - SAN

2 stops22h 06mBritish Airways

Deal found 12/14

$489

Tue 1/278:05 amSAN - OPO

2 stops18h 25mMultiple Airlines

Tue 2/35:00 amOPO - SAN

2 stops23h 48mMultiple Airlines

Deal found 12/13

$493

Fri 1/309:55 amSAN - OPO

2 stops18h 55mMultiple Airlines

Fri 2/612:50 pmOPO - SAN

2 stops39h 59mMultiple Airlines

Deal found 12/14

$496

One-way flights from San Diego to Porto
Search for one-way flight options from San Diego to Porto. Find affordable one-way fares based on user searches. Data last updated December 15, 2025.

Tue 4/148:54 pmSAN - OPO

2 stops30h 46mMultiple Airlines

Deal found 12/13

$551

Wed 6/107:00 amSAN - OPO

2 stops20h 40mMultiple Airlines

Deal found 12/13

$565

Thu 5/1411:08 amSAN - OPO

2 stops19h 52mMultiple Airlines

Deal found 12/13

$579

Tue 4/147:44 pmSAN - OPO

3 stops30h 01mUnited Airlines

Deal found 12/13

$664

Thu 5/145:15 pmSAN - OPO

1 stop22h 10mLufthansa

Deal found 12/15

$790

Thu 5/147:40 pmSAN - OPO

3 stops30h 05mUnited Airlines

Deal found 12/13

$839

Find flight deals from San Diego to Porto

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$467 (Billigflug)
Popular in	June
Cheapest in	February
Average price	$708

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

Highest demand for flights based on searches. 23% potential increase in price ($291 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 3/10

3:00 pm-3:25 pm

1 stop17h 25m

Porto

Fri 3/20

4:10 pm-1:05 pm

1 stop27h 55m

$484

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sat 1/17

1:35 pm-10:30 am

2 stops36h 55m

Porto

Sun 2/1

5:00 am-12:05 am

2 stops27h 05m

$485

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sat 1/17

6:00 pm-7:15 pm

1 stop17h 15m

Porto

Sun 2/1

8:20 am-10:26 pm

2 stops22h 06m

$489

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Fri 1/30

9:55 am-12:50 pm

2 stops18h 55m

Porto

Fri 2/6

12:50 pm-8:49 pm

2 stops39h 59m

$496

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sat 1/17

6:00 pm-7:15 pm

1 stop17h 15m

Porto

Sun 2/1

8:20 am-10:26 pm

2 stops22h 06m

$498

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 4/14

8:54 pm-11:40 am

2 stops30h 46m

$551

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Wed 6/10

7:00 am-11:40 am

2 stops20h 40m

$565

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Thu 5/14

11:08 am-3:00 pm

2 stops19h 52m

$579

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 4/14

7:44 pm-9:45 am

3 stops30h 01m

$664

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Thu 5/14

5:15 pm-11:25 pm

1 stop22h 10m

$790

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Compare providers for flights from San Diego to Porto

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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
AranGrant	Price Accuracy2 stars	Trust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Diego-Porto flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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, October is the cheapest month in which you can book a flight from San Diego to Porto (average of $604). Flying from San Diego to Porto in June is currently the most expensive (average of $1,225). 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?

It’s optimal to fly from San Diego to Porto in the afternoon. By choosing this option you can save up to 32% on the cost of your flight, compared to a flight in the evening.

Reviews of airlines servicing Porto

Peruse reviews from past customers who have flown with 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.

United Airlines

7.4

Good

9,092 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

United Airlines

7.4

Good

9,092 reviews

United Airlines

7.4

Good

9,092 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Lufthansa

6.8

Okay

7,628 reviews

United Airlines

7.4

Good

9,092 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

How long is the flight from San Diego to Porto?
For as low as $484, KLM can have you in Porto from San Diego in 17h 25m. 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. Another option worth looking into is Lufthansa, starting at $650 round trip. You may be able to fly from San Diego to Porto for 36% 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, October is the cheapest month in which you can book a flight from San Diego to Porto (average of $604). Flying from San Diego to Porto in June is currently the most expensive (average of $1,225). 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

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Top 2 airlines flying from San Diego to Porto

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$615	Average$1,235	FlexibilityNo cancel fee	On-time69%
Lufthansa	Cheapest$650	Average$935	FlexibilityNo cancel fee	On-time76%

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$467+ Cheap flights from San Diego (SAN) to Porto (OPO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/17. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from San Diego to Porto with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from San Diego to Porto

Cheapest flights from San Diego to PortoExplore 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 December 15, 2025.

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 December 15, 2025.

Find flight deals from San Diego to Porto

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

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 December.

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.

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?

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

Reviews of airlines servicing Porto

Peruse reviews from past customers who have flown with 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.

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?

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

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

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

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

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

Traveling to a place near Porto?

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Alternative routes for San Diego to Porto

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Top 2 airlines flying from San Diego to Porto

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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 December 15, 2025.