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Cheap flights from Portsmouth to Fremont from £400

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 21/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SFO
17 Apr — 24 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Fremont

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Fremont
Explore the most affordable flight options available from Portsmouth to Fremont. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 March 2026.

Thu 30/409:20
SOU
-
SFO
1 stop14h 30m
Aer Lingus
Thu 7/517:35
SFO
-
SOU
1 stop17h 55m
Aer Lingus
Deal found 16/3£620
Tue 28/417:20
SOU
-
SFO
1 stop26h 25m
KLM
Tue 5/513:45
SFO
-
SOU
1 stop19h 05m
KLM
Deal found 14/3£622
Fri 1/520:00
SOU
-
SFO
1 stop27h 55m
Aer Lingus
Fri 8/517:35
SFO
-
SOU
1 stop31h 00m
Aer Lingus
Deal found 17/3£641
Thu 30/409:20
SOU
-
SFO
1 stop14h 30m
Multiple Airlines
Thu 7/517:35
SFO
-
SOU
2 stops16h 05m
Multiple Airlines
Deal found 16/3£657
Thu 30/409:05
SOU
-
SFO
2 stops23h 22m
Delta
Thu 7/505:50
SFO
-
SOU
2 stops18h 45m
Delta
Deal found 16/3£671
Fri 1/517:20
SOU
-
SFO
1 stop26h 25m
KLM
Fri 8/513:45
SFO
-
SOU
2 stops35h 00m
KLM
Deal found 17/3£701
Sun 31/517:20
SOU
-
SFO
1 stop26h 25m
Delta
Mon 6/721:00
SFO
-
SOU
2 stops27h 45m
Delta
Deal found 15/3£722
Tue 23/617:20
SOU
-
SFO
1 stop26h 25m
Delta
Mon 13/710:31
SFO
-
SOU
2 stops23h 04m
Delta
Deal found 17/3£725
Sun 31/517:20
SOU
-
SFO
2 stops32h 29m
Delta
Tue 7/707:00
SFO
-
SOU
2 stops17h 45m
Delta
Deal found 15/3£726

Find flight deals from Portsmouth to Fremont

Keep the following information in mind while searching for Portsmouth to Fremont flight deals. Data was last updated 18 March 2026.

Round-trip from

£620

One-way from

£400

Popular in

December

Cheapest in

February

Average price

£486
Aer Lingus
  • Aer Lingus
  • 30/4-7/5
  • 2 total stops
  • 32h 25m total
  • Portsmouth to Fremont
Search Deals
21/6
  • 21/6
  • 3 total stops
  • 59h 35m total
  • Portsmouth to Fremont
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£21 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Fremont 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 858,174 searches. Data last updated 18 March 2026.
Use the filters below to find and compare flights from Portsmouth to Fremont that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Sun 31/5

09:15-11:45

1 stop34h 30m

San Francisco

Tue 7/7

07:00-08:45

2 stops17h 45m

£722

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Tue 2/6

17:20-16:57

2 stops31h 37m

San Francisco

Wed 8/7

22:00-08:45

2 stops26h 45m

£726

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Tue 2/6

17:20-16:57

2 stops31h 37m

San Francisco

Mon 6/7

16:00-08:45

2 stops32h 45m

£726

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Wed 24/6

09:05-21:14

2 stops20h 09m

San Francisco

Wed 8/7

00:40-08:45

2 stops24h 05m

£730
Fastest return journey

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Fri 11/9

20:00-15:55

1 stop27h 55m

San Francisco

Tue 15/9

17:40-16:50

1 stop15h 10m

£741

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Thu 23/4

17:20-15:50

1 stop30h 30m

San Francisco

Mon 27/4

16:35-08:25

2 stops31h 50m

£749

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Sat 30/5

17:20-11:45

1 stop26h 25m

San Francisco

Mon 6/7

21:00-08:45

2 stops27h 45m

£752

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Wed 3/6

17:20-11:45

1 stop26h 25m

San Francisco

Wed 8/7

00:40-08:45

2 stops24h 05m

£752

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Sat 30/5

09:15-11:45

1 stop34h 30m

San Francisco

Tue 7/7

07:00-08:45

2 stops17h 45m

£752
Cheapest one-way

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Sun 7/6

14:45-15:50

2 stops33h 05m

£503

Flights are sorted by cheapest return flights first.

Deals found on 16/3

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

Best time to book a flight from Portsmouth to Fremont

Have a flexible travel schedule? Discover the best time to fly to Fremont from Portsmouth with our price prediction graph.
Estimated return 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 Portsmouth to Fremont

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

Currently, February is the cheapest month in which you can book a flight from Portsmouth to Fremont (average of £356). Flying from Portsmouth to Fremont in July is currently the most expensive (average of £439). 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 P0R to FR8?

Find hourly flight availability from Portsmouth to Fremont. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 March 2026.

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

Weekly flight availability from Portsmouth to Fremont

Explore weekly flight availability from Portsmouth to Fremont. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 18 March 2026.

The most flights from P0R to FR8 are scheduled on a Monday (25 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (25 on average).

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Fremont. 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 Portsmouth to Fremont?

    Departing from Portsmouth to Fremont will take you 27h 55m. The distance from Portsmouth to Fremont is about 5349 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the most reliable airlines from Portsmouth to Fremont?

    Before booking your flight to Fremont from Portsmouth, check out the most reliable airlines to get you to your destination on time: KLM (93%), Air France (93%), Delta( 93%).

  • What are the cheapest flights from Portsmouth to Fremont?

    The cheapest flight price from Portsmouth to Fremont is £359. On average you can expect to pay £1,834. The most popular route, (Southampton Eastleigh - San Francisco), can usually be booked for £641.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Portsmouth to Fremont (average of £356). Flying from Portsmouth to Fremont in July is currently the most expensive (average of £439). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Portsmouth to Fremont

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Top 10 airlines flying from Portsmouth to Fremont

Discover the top 10 airlines that operate flights from Portsmouth to Fremont. 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 858,174 searches. Data last updated 18 March 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£323Average£589FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapest£338Average£469FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapest£340Average£550FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£353Average£509FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
SWISSCheapest£354Average£453FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Scandinavian AirlinesCheapest£361Average£558FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£362Average£462FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
LufthansaCheapest£370Average£528FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Brussels AirlinesCheapest£375Average£488FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
FinnairCheapest£376Average£487FlexibilityNo cancel feeOn-time76%
Search Finnair flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Portsmouth to Fremont?

Cheapflights makes it easy to find Portsmouth to Fremont flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Fremont?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Fremont from Portsmouth.

Can Cheapflights find flights from Portsmouth to Fremont with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Portsmouth to Fremont, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Portsmouth to Fremont become cheaper?

Yes, Cheapflights offers price alerts on Portsmouth to Fremont flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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