How long is the flight from San Diego to Porto?

For as low as $493, KLM can have you in Porto from San Diego in 18h 30m. 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.

$246+ Flights from San Diego to Porto

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

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 29, 2025.

Mon 12/298:13 amSAN - OPO

2 stops25h 22mBritish Airways

Sun 1/48:05 pmOPO - SAN

2 stops27h 43mBritish Airways

Deal found 12/27

$1,318

Mon 12/297:40 amSAN - OPO

3 stops23h 15mUnited Airlines

Sun 1/46:55 amOPO - SAN

2 stops21h 57mUnited Airlines

Deal found 12/27

$2,253

Mon 12/297:05 amSAN - OPO

1 stop20h 45mMultiple Airlines

Sun 1/42:45 pmOPO - SAN

2 stops53h 54mMultiple Airlines

Deal found 12/27

$2,510

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 29, 2025.

Tue 3/103:00 pmSAN - OPO

1 stop24h 25mKLM

Fri 3/2011:15 amOPO - SAN

1 stop32h 50mKLM

Deal found 12/27

$485

Tue 2/108:00 amSAN - OPO

2 stops18h 30mMultiple Airlines

Tue 2/179:55 amOPO - SAN

2 stops21h 07mMultiple Airlines

Deal found 12/27

$485

Mon 2/98:00 amSAN - OPO

2 stops18h 30mDelta

Mon 2/165:00 amOPO - SAN

2 stops23h 53mDelta

Deal found 12/27

$493

Tue 2/107:00 amSAN - OPO

2 stops23h 45mLufthansa

Tue 2/171:45 pmOPO - SAN

1 stop34h 00mLufthansa

Deal found 12/27

$509

Tue 1/137:00 amSAN - OPO

2 stops20h 40mUnited Airlines

Tue 2/36:00 amOPO - SAN

3 stops40h 52mUnited Airlines

Deal found 12/27

$713

Tue 3/106:15 amSAN - OPO

2 stops21h 15mDelta

Fri 3/205:00 amOPO - SAN

2 stops26h 11mDelta

Deal found 12/27

$546

Mon 3/3010:00 amSAN - OPO

2 stops28h 30mDelta

Fri 4/105:00 amOPO - SAN

2 stops26h 40mDelta

Deal found 12/28

$601

Tue 1/137:00 amSAN - OPO

2 stops21h 50mMultiple Airlines

Tue 2/36:00 amOPO - SAN

2 stops37h 53mMultiple Airlines

Deal found 12/27

$686

Sun 5/105:15 pmSAN - OPO

1 stop22h 10mLufthansa

Mon 6/111:05 amOPO - SAN

1 stop36h 20mLufthansa

Deal found 12/27

$720

Sun 3/296:15 amSAN - OPO

2 stops25h 10mDelta

Fri 4/105:00 amOPO - SAN

2 stops26h 40mDelta

Deal found 12/28

$601

Tue 3/311:40 pmSAN - OPO

1 stop20h 30mDelta

Fri 4/105:00 amOPO - SAN

2 stops26h 40mDelta

Deal found 12/28

$602

Sat 3/2811:15 amSAN - OPO

2 stops26h 45mDelta

Fri 4/105:00 amOPO - SAN

2 stops26h 40mDelta

Deal found 12/28

$661

Last-minute flights from San Diego to Porto
Discover last-minute flight deals from San Diego to Porto. Data last updated December 29, 2025 and is based on user searches.

Mon 12/298:13 amSAN - OPO

2 stops25h 22mBritish Airways

Sun 1/48:05 pmOPO - SAN

2 stops27h 43mBritish Airways

Deal found 12/27

$1,318

Mon 12/297:40 amSAN - OPO

3 stops23h 15mUnited Airlines

Sun 1/46:55 amOPO - SAN

2 stops21h 57mUnited Airlines

Deal found 12/27

$2,253

Mon 12/297:05 amSAN - OPO

1 stop20h 45mMultiple Airlines

Sun 1/42:45 pmOPO - SAN

2 stops53h 54mMultiple Airlines

Deal found 12/27

$2,510

Thu 1/87:05 amSAN - OPO

2 stops19h 20mMultiple Airlines

Wed 1/146:00 amOPO - SAN

2 stops21h 39mMultiple Airlines

Deal found 12/27

$738

Thu 1/85:35 pmSAN - OPO

1 stop35h 15mLufthansa

Wed 1/141:45 pmOPO - SAN

2 stops38h 09mLufthansa

Deal found 12/27

$854

Tue 1/137:00 amSAN - OPO

2 stops21h 50mMultiple Airlines

Tue 2/36:00 amOPO - SAN

2 stops37h 53mMultiple Airlines

Deal found 12/27

$686

Tue 1/137:00 amSAN - OPO

2 stops20h 40mUnited Airlines

Tue 2/36:00 amOPO - SAN

3 stops40h 52mUnited Airlines

Deal found 12/27

$713

Tue 1/137:00 amSAN - OPO

1 stop20h 50mTAP AIR PORTUGAL

Tue 2/36:00 pmOPO - SAN

2 stops34h 15mTAP AIR PORTUGAL

Deal found 12/27

$1,298

Fri 1/238:10 amSAN - OPO

2 stops19h 30mUnited Airlines

Tue 1/276:00 amOPO - SAN

2 stops37h 53mUnited Airlines

Deal found 12/26

$779

Fri 1/237:00 amSAN - OPO

1 stop21h 00mTAP AIR PORTUGAL

Tue 1/278:00 pmOPO - SAN

2 stops32h 20mTAP AIR PORTUGAL

Deal found 12/26

$1,353

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 29, 2025.

Tue 5/51:40 pmSAN - OPO

1 stop24h 35mKLM

Deal found 12/28

$246

Tue 5/57:40 pmSAN - OPO

2 stops28h 00mIberia

Deal found 12/28

$247

Tue 4/146:40 amSAN - OPO

2 stops17h 00mAmerican Airlines

Deal found 12/28

$255

Sun 1/256:30 amSAN - OPO

3 stops41h 05mMultiple Airlines

Deal found 12/26

$315

Tue 4/142:00 pmSAN - OPO

2 stops18h 00mIberia

Deal found 12/27

$352

Tue 5/511:05 amSAN - OPO

3 stops23h 05mMultiple Airlines

Deal found 12/28

$394

Mon 2/210:52 amSAN - OPO

2 stops40h 23mSWISS

Deal found 12/26

$408

Mon 2/26:15 amSAN - OPO

3 stops24h 40mUnited Airlines

Deal found 12/26

$419

Tue 4/141:40 pmSAN - OPO

1 stop17h 50mKLM

Deal found 12/28

$487

Tue 4/147:40 pmSAN - OPO

3 stops30h 05mUnited Airlines

Deal found 12/27

$514

Find flight deals from San Diego to Porto

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$482 (FlightHub)
One-way from	$255 (American Airlines)
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

One-way flight from San Diego to Porto

Search Deals

Highest demand for flights based on searches. 23% potential increase in price ($293 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-10:25 pm

1 stop24h 25m

Porto

Fri 3/20

11:15 am-1:05 pm

1 stop32h 50m

$485

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 2/10

8:00 am-10:30 am

2 stops18h 30m

Porto

Tue 2/17

9:55 am-11:02 pm

2 stops21h 07m

$485

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 2/9

8:00 am-10:30 am

2 stops18h 30m

Porto

Mon 2/16

5:00 am-8:53 pm

2 stops23h 53m

$493

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 2/10

7:00 am-2:45 pm

2 stops23h 45m

Porto

Tue 2/17

1:45 pm-3:45 pm

1 stop34h 00m

$509

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 3/10

6:15 am-10:30 am

2 stops21h 15m

Porto

Fri 3/20

5:00 am-12:11 am

2 stops26h 11m

$546

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Mon 3/30

10:00 am-10:30 pm

2 stops28h 30m

Porto

Fri 4/10

5:00 am-11:40 pm

2 stops26h 40m

$601

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sun 3/29

6:15 am-3:25 pm

2 stops25h 10m

Porto

Fri 4/10

5:00 am-11:40 pm

2 stops26h 40m

$601

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 3/31

1:40 pm-6:10 pm

1 stop20h 30m

Porto

Fri 4/10

5:00 am-11:40 pm

2 stops26h 40m

$602

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Sat 3/28

11:15 am-9:00 pm

2 stops26h 45m

Porto

Fri 4/10

5:00 am-11:40 pm

2 stops26h 40m

$661

San DiegoPorto

SAN - OPO

SANOPO

San Diego

Tue 1/13

7:00 am-12:50 pm

2 stops21h 50m

Porto

Tue 2/3

6:00 am-11:53 am

2 stops37h 53m

$686

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/28

Showing 1-10 of 21 results

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

9,118 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

9,118 reviews

United Airlines

7.4

Good

9,118 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

7,659 reviews

United Airlines

7.4

Good

9,118 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 $493, KLM can have you in Porto from San Diego in 18h 30m. 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

Aveiro

Arcos de Valdevez

Coimbra

Vila Nova de Gaia

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for San Diego to Porto

San Francisco to Lisbon flights

Los Angeles to Lisbon flights

San Jose to Lisbon flights

Santa Ana to Lisbon flights

Ontario to Lisbon flights

San Francisco to Porto flights

Los Angeles to Porto flights

Oakland to Lisbon flights

San Diego to Lisbon flights

San Jose to Porto flights

Las Vegas to Lisbon flights

San Francisco to Lajes flights

Ontario to Porto flights

Sacramento to Porto flights

Sacramento to Lisbon flights

Los Angeles to Faro flights

Burbank to Lisbon flights

San Francisco to Ponta Delgada flights

Reno to Lisbon flights

Los Angeles to Funchal flights

Santa Ana to Porto flights

Los Angeles to Ponta Delgada flights

Santa Rosa to Lisbon flights

San Francisco to Faro flights

Fresno to Lisbon flights

San Francisco to Funchal flights

Palm Springs to Lisbon flights

San Jose to Faro flights

Long Beach to Lisbon flights

Los Angeles to Lajes flights

San Diego to Ponta Delgada flights

San Diego to Faro flights

Oakland to Ponta Delgada flights

San Jose to Lajes flights

Las Vegas to Funchal flights

Las Vegas to Faro flights

Oakland to Porto flights

San Francisco to Horta flights

Santa Barbara to Lisbon flights

Los Angeles to Pico Island flights

Oakland to Funchal flights

Burbank to Porto flights

Monterey to Lisbon flights

San Francisco to Pico Island flights

Santa Ana to Faro flights

Ontario to Ponta Delgada flights

Sacramento to Lajes flights

Other flights to Porto

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%

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.

$246+ 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 5/5. 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 29, 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 29, 2025.

Find flight deals from San Diego to Porto

Most accurate provider

Most trusted provider

Round-trip from

One-way 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?

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.

Top 2 airlines flying from San Diego to Porto

100% Free

Book with Flexibility

Travel Smart

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 29, 2025.