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$294+ 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 11/14. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — OPO
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheapflights Tip: The best prices from Fremont to Porto are usually found in January or October, booked 89 days in advance, depart on a Thursday or Monday and return on a Wednesday

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 October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/27:25 pmSFO - OPO
1 stop31h 50mSWISS
Tue 12/97:25 pmOPO - SFO
1 stop29h 05mSWISS
Deal found 10/28$512
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/17:25 pmSFO - OPO
1 stop31h 50mSWISS
Mon 12/157:20 pmOPO - SFO
1 stop29h 10mSWISS
Deal found 10/28$513
This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/28:25 amSFO - OPO
2 stops19h 15mMultiple Airlines
Tue 12/97:25 pmOPO - SFO
1 stop29h 05mMultiple Airlines
Deal found 10/28$520
This Air France deal was found by Cheapflights users on 10/28. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/68:15 amSFO - OPO
2 stops18h 15mMultiple Airlines
Fri 12/126:30 amOPO - SFO
1 stop37h 20mMultiple Airlines
Deal found 10/28$531
This Air France deal was found by Cheapflights users on 10/28. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/13:40 pmSFO - OPO
1 stop34h 50mMultiple Airlines
Mon 12/156:30 amOPO - SFO
2 stops19h 34mMultiple Airlines
Deal found 10/28$538
This Delta deal was found by Cheapflights users on 10/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/25:45 amSFO - OPO
2 stops20h 45mDelta
Tue 12/96:05 amOPO - SFO
2 stops25h 00mDelta
Deal found 10/28$541
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/18:55 pmSFO - OPO
2 stops33h 50mUnited Airlines
Mon 12/1512:30 pmOPO - SFO
2 stops29h 10mUnited Airlines
Deal found 10/28$557
This United Airlines deal was found by Cheapflights users on 10/30. 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 11/211:45 amSFO - OPO
1 stop13h 45mUnited Airlines
Wed 11/196:00 amOPO - SFO
1 stop22h 10mUnited Airlines
Deal found 10/30$623
This United deal was found by Cheapflights users on 10/30. 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.
Tue 11/411:45 amSFO - OPO
1 stop13h 45mMultiple Airlines
Tue 11/1812:05 pmOPO - SFO
1 stop36h 25mMultiple Airlines
Deal found 10/30$626

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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$470
(oojo)

One-way from

$294
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$720
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. 18% potential increase in price ($212 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 October 30, 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

Sat 12/6

7:25 pm-6:35 pm

1 stop15h 10m

Porto

Fri 12/12

7:20 pm-4:30 pm

1 stop29h 10m

$513

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 1/15

7:25 pm-11:10 am

1 stop31h 45m

Porto

Thu 1/29

12:05 pm-4:30 pm

1 stop36h 25m

$529

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 2/14

7:25 pm-6:35 pm

1 stop15h 10m

Porto

Sun 2/22

7:25 pm-4:30 pm

1 stop29h 05m

$529

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 2/23

7:25 pm-11:15 am

1 stop31h 50m

Porto

Mon 3/2

12:05 pm-4:30 pm

1 stop36h 25m

$536

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 12/2

5:45 am-10:30 am

2 stops20h 45m

Porto

Tue 12/9

6:05 am-11:05 pm

2 stops25h 00m

$541

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 1/15

1:20 pm-11:40 am

2 stops38h 20m

Porto

Thu 1/29

6:00 am-10:54 am

2 stops36h 54m

$545

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 1/7

11:25 pm-11:40 am

2 stops28h 15m

Porto

Wed 1/14

1:45 pm-7:35 pm

1 stop37h 50m

$546

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 1/14

5:00 am-11:40 am

3 stops22h 40m

Porto

Thu 1/22

6:00 am-1:30 pm

2 stops39h 30m

$549

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 2/23

10:10 am-10:30 am

2 stops16h 20m

Porto

Mon 3/2

4:10 pm-11:50 am

1 stop27h 40m

$556

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 1/14

5:00 am-11:40 am

3 stops22h 40m

Porto

Fri 1/23

12:30 pm-9:22 pm

2 stops40h 52m

$562

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 14 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 October 24, 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 $535). Flying from Fremont to Porto in July is currently the most expensive (average of $805). 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 October 30, 2025.

When flying from Fremont to Porto, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 16% versus a flight in the evening.

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 Saturday mornings when fares are most often at their lowest. Sunday mornings 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 October 30, 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
1,775 reviews

Food

7.1

Crew

8.2

Comfort

7.4

Overall

7.5

Boarding

7.7

Entertainment

6.8

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
1,775 reviews
SWISS
7.5
Good
1,775 reviews

Food

7.1

Crew

8.2

Comfort

7.4

Overall

7.5

Boarding

7.7

Entertainment

6.8

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
8,998 reviews
SWISS
7.5
Good
1,775 reviews

Food

7.1

Crew

8.2

Comfort

7.4

Overall

7.5

Boarding

7.7

Entertainment

6.8

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
10,377 reviews
SWISS
7.5
Good
1,775 reviews

Food

7.1

Crew

8.2

Comfort

7.4

Overall

7.5

Boarding

7.7

Entertainment

6.8

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
2,037 reviews
SWISS
7.5
Good
1,775 reviews

Food

7.1

Crew

8.2

Comfort

7.4

Overall

7.5

Boarding

7.7

Entertainment

6.8

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
7,541 reviews
SWISS
7.5
Good
1,775 reviews

Food

7.1

Crew

8.2

Comfort

7.4

Overall

7.5

Boarding

7.7

Entertainment

6.8

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 SWISS and Delta fly from Fremont to Porto in about 15h 10m. The time it takes to get you to your destination can typically vary by up to 5h 35m. 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 $535). Flying from Fremont to Porto in July is currently the most expensive (average of $805). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$527Average$781FlexibilityNo cancel feeOn-time77%
IberiaCheapest$540Average$1,116FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$574Average$878FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$636Average$955FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$652Average$1,020FlexibilityNo cancel feeOn-time69%
DeltaCheapest$661Average$1,105FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$667Average$1,146FlexibilityNo 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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