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Cheap flights from Portsmouth to Fremont from £445

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 25/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SFO
12 Sep — 19 Sep1
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 13 August 2026.

Wed 2/909:20 -
1 stop14h 35m
Tue 8/917:40 -
1 stop15h 10m
Deal found 8/8£566
Wed 16/908:55 -
1 stop15h 00m
Wed 23/917:40 -
1 stop15h 10m
Deal found 10/8£594
Thu 10/1217:30 -
1 stop26h 15m
Sat 16/106:15 -
2 stops18h 40m
Deal found 8/8£677
Sat 22/817:30 -
1 stop26h 15m
Sun 27/906:35 -
2 stops18h 00m
Deal found 8/8£686

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 13 August 2026.

Round-trip from

£566

One-way from

£445

Popular in

December

Cheapest in

February

Average price

£600
Aer Lingus
  • Aer Lingus
  • 2/9-8/9
  • 2 total stops
  • 29h 45m total
  • Portsmouth to Fremont
Search Deals
Aer Lingus
  • Aer Lingus
  • 25/10
  • 2 total stops
  • 30h 37m total
  • Portsmouth to Fremont
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (£3 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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 13 August 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 Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Tue 8/12

08:40-11:45

1 stop35h 05m

San Francisco

Fri 22/1

13:50-17:00

1 stop19h 10m

£677

SouthamptonSan Francisco

SOU Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Tue 8/12

08:40-11:45

1 stop35h 05m

San Francisco

Thu 21/1

14:00-17:00

2 stops19h 00m

£677

SouthamptonSan Francisco

SOU Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Thu 21/1

17:30-11:45

1 stop26h 15m

San Francisco

Fri 5/2

09:00-17:00

2 stops24h 00m

£684
Fastest return journey

SouthamptonSan Francisco

SOU Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Fri 22/1

17:30-11:45

1 stop26h 15m

San Francisco

Sun 7/2

07:00-08:10

2 stops17h 10m

£684

SouthamptonSan Francisco

SOU Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Sat 23/1

17:30-11:45

1 stop26h 15m

San Francisco

Tue 9/2

23:45-08:10

2 stops24h 25m

£684

SouthamptonSan Francisco

SOU Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Sat 22/8

17:30-11:45

1 stop26h 15m

San Francisco

Mon 28/9

10:29-16:50

2 stops22h 21m

£686

SouthamptonSan Francisco

SOU Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Sat 22/8

17:30-11:45

1 stop26h 15m

San Francisco

Wed 30/9

06:35-08:35

2 stops18h 00m

£686

SouthamptonSan Francisco

SOU Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Sun 23/8

17:30-11:45

1 stop26h 15m

San Francisco

Sun 27/9

21:43-08:35

2 stops26h 52m

£686

SouthamptonSan Francisco

SOU Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Sun 23/8

09:15-11:45

1 stop34h 30m

San Francisco

Thu 1/10

13:45-08:45

1 stop35h 00m

£686

SouthamptonSan Francisco

SOU Southampton Eastleigh - SFO San Francisco

SOUSFO

Southampton Eastleigh

Sun 23/8

09:15-11:45

1 stop34h 30m

San Francisco

Mon 28/9

10:29-16:50

2 stops22h 21m

£686

Flights are sorted by cheapest return flights first.

Deals found on 9/8

Showing 1-10 of 22 resultsSorted by cheapest first
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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 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 13 August 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 13 August 2026.

The most flights from P0R to FR8 are scheduled on a Monday (38 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (32 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 35h 05m. The distance from Portsmouth to Fremont is about 5349 mi.

  • 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: Air Canada (74%), Austrian Airlines (74%), United Airlines( 74%).

  • What are the cheapest flights from Portsmouth to Fremont?

    The cheapest flight price from Portsmouth to Fremont is £323. On average you can expect to pay £1,391. 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.

See more FAQs

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Alternative routes for Portsmouth to Fremont

See prices for flight routes from nearby airports that may be better suited for you.
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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 13 August 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£274Average£674FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
SWISSCheapest£348Average£468FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Aer LingusCheapest£352Average£573FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
TAP AIR PORTUGALCheapest£358Average£477FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Virgin AtlanticCheapest£365Average£543FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Brussels AirlinesCheapest£370Average£510FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
Austrian AirlinesCheapest£372Average£499FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
LufthansaCheapest£378Average£563FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£383Average£557FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£383Average£580FlexibilityNo cancel feeOn-time69%
Search United Airlines 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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