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$309+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — OPO
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Fremont to Porto are usually found in January or February, booked 89 days in advance, depart on a Thursday or Monday and return on a Wednesday

Cheap flight deals from Fremont to Porto

Keep the following information in mind while searching for Fremont to Porto flight deals. Data was last updated September 15, 2025.

Round-trip from

$430
(FlightHub)

One-way from

$309
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$929
From Fremont to Porto
Search Deals
One-way flight from Fremont to Porto
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Highest demand for flights based on searches. 18% potential increase in price ($215 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($26 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 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 September 15, 2025.

This Mytrip deal was found by Cheapflights users on 9/15. 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.
Tue 10/148:30 amSFO - OPO
2 stops22h 30mMultiple Airlines
Tue 10/2110:50 pmOPO - SFO
2 stops29h 01mMultiple Airlines
Deal found 9/15$489
This Scandinavian Airlines deal was found by Cheapflights users on 9/15. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/64:40 pmSFO - OPO
1 stop16h 15mScandinavian Airlines
Fri 11/215:35 pmOPO - SFO
1 stop29h 00mScandinavian Airlines
Deal found 9/15$499
This oojo deal was found by Cheapflights users on 9/14. 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.
Tue 10/144:20 pmSFO - OPO
1 stop20h 05mTAP AIR PORTUGAL
Wed 10/227:00 amOPO - SFO
1 stop15h 35mTAP AIR PORTUGAL
Deal found 9/14$526
This FlightHub deal was found by Cheapflights users on 9/13. 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.
Fri 11/77:10 pmSFO - OPO
1 stop18h 50mTAP AIR PORTUGAL
Mon 11/176:55 amOPO - SFO
1 stop15h 40mTAP AIR PORTUGAL
Deal found 9/13$528
This FlightHub deal was found by Cheapflights users on 9/15. 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 11/84:35 pmSFO - OPO
1 stop17h 30mTAP AIR PORTUGAL
Wed 11/196:55 amOPO - SFO
1 stop15h 35mTAP AIR PORTUGAL
Deal found 9/15$529
This Gotogate deal was found by Cheapflights users on 9/13. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/288:25 pmSFO - OPO
1 stop15h 05mMultiple Airlines
Tue 11/46:00 amOPO - SFO
2 stops23h 34mMultiple Airlines
Deal found 9/13$532
This United deal was found by Cheapflights users on 9/15. 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.
Mon 11/310:45 pmSFO - OPO
2 stops26h 45mMultiple Airlines
Tue 11/1812:30 pmOPO - SFO
1 stop15h 40mMultiple Airlines
Deal found 9/15$534
This United Airlines deal was found by Cheapflights users on 9/15. 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 11/911:44 pmSFO - OPO
2 stops25h 46mUnited Airlines
Fri 11/2112:30 pmOPO - SFO
1 stop15h 40mUnited Airlines
Deal found 9/15$540
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/144:20 pmSFO - OPO
1 stop20h 05mTAP AIR PORTUGAL
Tue 10/219:15 pmOPO - SFO
1 stop25h 20mTAP AIR PORTUGAL
Deal found 9/15$543

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 September 15, 2025.
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

Thu 11/6

4:40 pm-4:55 pm

1 stop16h 15m

Porto

Fri 11/21

5:35 pm-2:35 pm

1 stop29h 00m

$499

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 11/8

4:35 pm-6:05 pm

1 stop17h 30m

Porto

Mon 11/17

6:55 am-2:35 pm

1 stop15h 40m

$528

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Fri 11/7

7:10 pm-10:00 pm

1 stop18h 50m

Porto

Mon 11/17

6:55 am-2:35 pm

1 stop15h 40m

$528

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 11/18

12:43 am-9:30 am

2 stops24h 47m

Porto

Wed 11/26

12:30 pm-8:10 pm

1 stop15h 40m

$540

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 11/9

11:44 pm-9:30 am

2 stops25h 46m

Porto

Thu 11/20

12:35 pm-12:12 am

2 stops19h 37m

$547

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 11/1

11:10 pm-9:30 am

2 stops27h 20m

Porto

Fri 11/14

12:35 pm-7:35 am

2 stops27h 00m

$547

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 11/5

1:35 pm-3:25 pm

1 stop17h 50m

Porto

Thu 11/20

12:30 pm-8:10 pm

1 stop15h 40m

$552

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 11/5

2:40 pm-3:25 pm

1 stop16h 45m

Porto

Fri 11/21

12:30 pm-8:10 pm

1 stop15h 40m

$552

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 11/8

7:25 am-9:30 am

2 stops18h 05m

Porto

Thu 11/20

12:30 pm-8:10 pm

1 stop15h 40m

$584

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/15

10:15 am-3:20 pm

3 stops45h 05m

$309

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 16 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 September 12, 2025.

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 89 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, January is the cheapest month in which you can book a flight from Fremont to Porto (average of $523). Flying from Fremont to Porto in June is currently the most expensive (average of $1,027). 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 FR8 to OPO?

Find hourly flight availability from Fremont 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 September 15, 2025.

When flying from Fremont to Porto, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from Fremont to Porto?

Use this chart to determine the cheapest time to fly round-trip from Fremont to Porto. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Fremont to Porto flight should consider departing on Sunday afternoons when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 September 15, 2025.
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
7.5
Good
1,730 reviews

Entertainment

6.8

Crew

8.2

Comfort

7.4

Overall

7.5

Food

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.
SWISS
7.5
Good
1,730 reviews
SWISS
7.5
Good
1,730 reviews

Entertainment

6.8

Crew

8.2

Comfort

7.4

Overall

7.5

Food

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.
United Airlines
7.4
Good
8,929 reviews
SWISS
7.5
Good
1,730 reviews

Entertainment

6.8

Crew

8.2

Comfort

7.4

Overall

7.5

Food

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.
Air Canada
7.1
Good
10,000 reviews
SWISS
7.5
Good
1,730 reviews

Entertainment

6.8

Crew

8.2

Comfort

7.4

Overall

7.5

Food

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.
TAP AIR PORTUGAL
7.1
Good
1,975 reviews
SWISS
7.5
Good
1,730 reviews

Entertainment

6.8

Crew

8.2

Comfort

7.4

Overall

7.5

Food

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.
Lufthansa
6.8
Okay
7,407 reviews
SWISS
7.5
Good
1,730 reviews

Entertainment

6.8

Crew

8.2

Comfort

7.4

Overall

7.5

Food

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.

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 12 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, TAP AIR PORTUGAL, and United Airlines fly from Fremont to Porto in about 16h 15m. The time it takes to get you to your destination can typically vary by up to 8h 32m. Fremont and Porto are separated by a distance of 5566 mi. This flight may include one or multiple stops.

  • 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, January is the cheapest month in which you can book a flight from Fremont to Porto (average of $523). Flying from Fremont to Porto in June is currently the most expensive (average of $1,027). 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

Browse thousands of different options on Cheapflights for your next trip

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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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$540Average$1,116FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$572Average$879FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$624Average$781FlexibilityNo cancel feeOn-time77%
SWISSCheapest$636Average$1,007FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$652Average$1,008FlexibilityNo cancel feeOn-time69%
DeltaCheapest$661Average$1,095FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$667Average$1,131FlexibilityNo cancel feeOn-time76%
KLMCheapest$673Average$879FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$776Average$1,051FlexibilityNo cancel feeOn-time67%
Air TransatCheapest$781Average$819FlexibilityNo cancel feeOn-time50%

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