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$253+ Cheap flights from Fremont, CA 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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — OPO
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
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Cheap flight deals from Fremont to Porto

Cheapest flights from Fremont to Porto
Explore the most affordable flight options available from Fremont to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

This oojo deal was found by Cheapflights users on 1/26. 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.
Fri 4/178:20 pm
SFO
-
OPO
1 stop20h 20m
TAP AIR PORTUGAL
Sat 4/255:05 am
OPO
-
SFO
1 stop20h 30m
TAP AIR PORTUGAL
Deal found 1/26$431
This oojo deal was found by Cheapflights users on 1/28. 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.
Mon 2/234:35 pm
SFO
-
OPO
1 stop14h 25m
TAP AIR PORTUGAL
Mon 3/26:55 am
OPO
-
SFO
1 stop15h 40m
TAP AIR PORTUGAL
Deal found 1/28$432
This Mytrip deal was found by Cheapflights users on 1/26. 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.
Thu 4/237:55 pm
SFO
-
OPO
1 stop19h 05m
TAP AIR PORTUGAL
Mon 4/2710:35 pm
OPO
-
SFO
1 stop24h 00m
TAP AIR PORTUGAL
Deal found 1/26$444
This Trip.com deal was found by Cheapflights users on 1/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/144:35 pm
SFO
-
OPO
1 stop15h 40m
TAP AIR PORTUGAL
Tue 4/215:05 am
OPO
-
SFO
1 stop17h 30m
TAP AIR PORTUGAL
Deal found 1/27$447
This FlightHub deal was found by Cheapflights users on 1/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/145:35 pm
SFO
-
OPO
1 stop14h 25m
TAP AIR PORTUGAL
Mon 3/236:55 am
OPO
-
SFO
1 stop15h 40m
TAP AIR PORTUGAL
Deal found 1/26$448
This FlightHub deal was found by Cheapflights users on 1/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/234:35 pm
SFO
-
OPO
1 stop17h 40m
TAP AIR PORTUGAL
Tue 3/36:00 pm
OPO
-
SFO
1 stop28h 30m
TAP AIR PORTUGAL
Deal found 1/28$449
This FlightHub deal was found by Cheapflights users on 1/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/164:35 pm
SFO
-
OPO
1 stop14h 25m
TAP AIR PORTUGAL
Sun 2/228:00 pm
OPO
-
SFO
1 stop26h 35m
TAP AIR PORTUGAL
Deal found 1/27$451
This FlightHub deal was found by Cheapflights users on 1/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/74:35 pm
SFO
-
OPO
1 stop34h 00m
TAP AIR PORTUGAL
Sun 3/158:00 pm
OPO
-
SFO
1 stop26h 35m
TAP AIR PORTUGAL
Deal found 1/27$455
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/138:10 pm
SFO
-
OPO
1 stop14h 50m
TAP AIR PORTUGAL
Tue 3/248:00 pm
OPO
-
SFO
1 stop26h 30m
TAP AIR PORTUGAL
Deal found 1/26$457
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/164:35 pm
SFO
-
OPO
1 stop14h 25m
TAP AIR PORTUGAL
Tue 2/2410:15 pm
OPO
-
SFO
1 stop24h 15m
TAP AIR PORTUGAL
Deal found 1/27$458
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/144:35 pm
SFO
-
OPO
1 stop15h 40m
TAP AIR PORTUGAL
Fri 4/2410:00 am
OPO
-
SFO
1 stop14h 50m
TAP AIR PORTUGAL
Deal found 1/27$459

Find flight deals from Fremont to Porto

Keep the following information in mind while searching for Fremont to Porto flight deals. Data was last updated January 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$431
(oojo)

One-way from

$253
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$892
Provider with most accurate pricing for San Francisco-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Porto flights.
Search Deals
From Fremont to Porto
Search Deals
One-way flight from Fremont to Porto
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($255 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Fremont 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 January 28, 2026.
Use the filters below to find and compare flights from Fremont to Porto that are best for you.

Fly from

Fremont

Fly to

Porto

Route

Depart

Return

Price

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 4/18

4:45 pm-5:05 pm

1 stop16h 20m

Porto

Wed 4/22

11:50 am-2:40 pm

1 stop34h 50m

$541

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

4:03 pm-4:55 pm

2 stops41h 52m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$634

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

7:50 pm-3:10 pm

1 stop36h 20m

Porto

Wed 3/18

4:10 pm-5:45 pm

1 stop32h 35m

$739

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 3/23

9:10 am-9:30 am

2 stops17h 20m

Porto

Wed 4/1

6:00 am-3:25 pm

1 stop17h 25m

$781

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/14

2:57 pm-10:05 pm

2 stops23h 08m

Porto

Tue 4/21

5:00 am-11:45 am

1 stop14h 45m

$783

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 4/15

11:00 am-10:00 pm

2 stops27h 00m

Porto

Thu 4/23

5:00 am-11:45 am

1 stop14h 45m

$783

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 5/9

7:00 am-5:05 pm

2 stops26h 05m

Porto

Sun 5/24

5:00 am-2:40 pm

2 stops17h 40m

$793

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 4/19

11:00 am-3:30 pm

2 stops20h 30m

Porto

Fri 5/1

11:45 am-1:23 am

2 stops21h 38m

$797

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 3/24

7:00 am-10:30 am

2 stops20h 30m

Porto

Thu 4/2

5:00 am-11:45 am

1 stop14h 45m

$808

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 4/12

12:45 am-11:10 am

2 stops26h 25m

Porto

Wed 4/22

12:35 pm-10:49 pm

2 stops18h 14m

$820

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 18 results
1
2

Best time to book a flight from Fremont to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Fremont 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 Fremont to Porto

How far ahead should I book a flight from Fremont to Porto?

Use this chart to determine the optimal time to book a round-trip flight from Fremont to Porto. Price data was last updated on January 23, 2026.

The price you pay for your flight from Fremont to Porto may vary depending on when you book. For the best chance of a lower fare, look to book 49 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, March is the cheapest month in which you can book a flight from Fremont to Porto (average of $468). Flying from Fremont to Porto in July is currently the most expensive (average of $807). 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.

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 January 28, 2026.
Peruse reviews from past customers who have flown with SWISS, United Airlines, and Air Canada from Fremont 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.
SWISS
7.6
Good
1,863 reviews

Boarding

7.7

Entertainment

6.8

Food

7.1

Overall

7.6

Crew

8.3

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Henriette,Dec 2025

FRA - GVA

My experience as a first time Flyer wasfinr except that both times when I flew to Frankfurt and also back to ORTambo my baggage go delayed. That was a bit of an awkward experience. Inve I can understand but twice I knew that I used connecting flights but who that happened to my my bag is really a bit out of the ordinary Although I must say the service to found my bag in Frankfurt was really excellent. Now I am waiting for my baggage to be send to my home airport Bram Fiacher in Bloemfontein. Hope I get it also so soon.
SWISS
7.6
Good
1,863 reviews
SWISS
7.6
Good
1,863 reviews

Boarding

7.7

Entertainment

6.8

Food

7.1

Overall

7.6

Crew

8.3

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Henriette,Dec 2025

FRA - GVA

My experience as a first time Flyer wasfinr except that both times when I flew to Frankfurt and also back to ORTambo my baggage go delayed. That was a bit of an awkward experience. Inve I can understand but twice I knew that I used connecting flights but who that happened to my my bag is really a bit out of the ordinary Although I must say the service to found my bag in Frankfurt was really excellent. Now I am waiting for my baggage to be send to my home airport Bram Fiacher in Bloemfontein. Hope I get it also so soon.
United Airlines
7.4
Good
9,208 reviews
SWISS
7.6
Good
1,863 reviews

Boarding

7.7

Entertainment

6.8

Food

7.1

Overall

7.6

Crew

8.3

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Henriette,Dec 2025

FRA - GVA

My experience as a first time Flyer wasfinr except that both times when I flew to Frankfurt and also back to ORTambo my baggage go delayed. That was a bit of an awkward experience. Inve I can understand but twice I knew that I used connecting flights but who that happened to my my bag is really a bit out of the ordinary Although I must say the service to found my bag in Frankfurt was really excellent. Now I am waiting for my baggage to be send to my home airport Bram Fiacher in Bloemfontein. Hope I get it also so soon.
Air Canada
7.1
Good
10,666 reviews
SWISS
7.6
Good
1,863 reviews

Boarding

7.7

Entertainment

6.8

Food

7.1

Overall

7.6

Crew

8.3

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Henriette,Dec 2025

FRA - GVA

My experience as a first time Flyer wasfinr except that both times when I flew to Frankfurt and also back to ORTambo my baggage go delayed. That was a bit of an awkward experience. Inve I can understand but twice I knew that I used connecting flights but who that happened to my my bag is really a bit out of the ordinary Although I must say the service to found my bag in Frankfurt was really excellent. Now I am waiting for my baggage to be send to my home airport Bram Fiacher in Bloemfontein. Hope I get it also so soon.
TAP AIR PORTUGAL
7.1
Good
2,130 reviews
SWISS
7.6
Good
1,863 reviews

Boarding

7.7

Entertainment

6.8

Food

7.1

Overall

7.6

Crew

8.3

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Henriette,Dec 2025

FRA - GVA

My experience as a first time Flyer wasfinr except that both times when I flew to Frankfurt and also back to ORTambo my baggage go delayed. That was a bit of an awkward experience. Inve I can understand but twice I knew that I used connecting flights but who that happened to my my bag is really a bit out of the ordinary Although I must say the service to found my bag in Frankfurt was really excellent. Now I am waiting for my baggage to be send to my home airport Bram Fiacher in Bloemfontein. Hope I get it also so soon.
Lufthansa
6.8
Okay
7,749 reviews
SWISS
7.6
Good
1,863 reviews

Boarding

7.7

Entertainment

6.8

Food

7.1

Overall

7.6

Crew

8.3

Comfort

7.4

Reviews

1 / 20
10.0
Excellent

Henriette,Dec 2025

FRA - GVA

My experience as a first time Flyer wasfinr except that both times when I flew to Frankfurt and also back to ORTambo my baggage go delayed. That was a bit of an awkward experience. Inve I can understand but twice I knew that I used connecting flights but who that happened to my my bag is really a bit out of the ordinary Although I must say the service to found my bag in Frankfurt was really excellent. Now I am waiting for my baggage to be send to my home airport Bram Fiacher in Bloemfontein. Hope I get it also so soon.

Related info for your journey

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

  • What airport do you fly into for flights to Porto from Fremont?

    Most people fly into Porto (OPO) if they book a flight to Porto from Fremont. On average, Porto has 0 inbound flights from Fremont per day from 11 airlines. Porto is conveniently located just 6.8 mi from Porto’s city center.

  • How long is the flight from Fremont to Porto?

    Airlines like Scandinavian Airlines, Turkish Airlines, and United Airlines fly from Fremont to Porto in about 16h 20m. The time it takes to get you to your destination can typically vary by up to 20h. Fremont and Porto are separated by a distance of 5566 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Fremont to Porto one-way?

    To fly one-way, consider booking your trip with Iberia, which is currently one of the cheapest options available, starting at $293. TAP AIR PORTUGAL flights start at $382 while deals on United Airlines start at $408 one-way.

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

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

  • How can I find direct flights from Fremont to Porto?

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

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

    Yes. Cheapflights offers flight deals from Fremont 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 Fremont to Porto?

    Currently, March is the cheapest month in which you can book a flight from Fremont to Porto (average of $468). Flying from Fremont to Porto in July is currently the most expensive (average of $807). 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

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Top 10 airlines flying from Fremont to Porto

Discover the top 10 airlines that operate flights from Fremont 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 January 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$460Average$624FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$550Average$846FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$625Average$1,048FlexibilityNo cancel feeOn-time76%
SWISSCheapest$626Average$912FlexibilityNo cancel feeOn-time79%
DeltaCheapest$661Average$1,145FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$675Average$1,032FlexibilityNo cancel feeOn-time69%
IberiaCheapest$676Average$1,116FlexibilityNo cancel feeOn-time77%
VuelingCheapest$756Average$938FlexibilityNo cancel feeOn-time88%
Air CanadaCheapest$776Average$1,112FlexibilityNo cancel feeOn-time67%
Air TransatCheapest$781Average$819FlexibilityNo cancel feeOn-time50%

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