HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portsmouth

$324+ Cheap flights from Fremont, CA to Portsmouth, England

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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — LHR
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Fremont to Portsmouth with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Fremont to Portsmouth

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

This Kiwi.com deal was found by Cheapflights users on 1/25. 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.
Wed 5/139:05 pm
SFO
-
SOU
2 stops28h 20m
Multiple Airlines
Mon 5/257:20 pm
SOU
-
SFO
1 stop30h 35m
Multiple Airlines
Deal found 1/25$769
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/172:55 pm
SFO
-
SOU
1 stop19h 05m
Delta
Tue 3/315:20 pm
SOU
-
SFO
1 stop26h 25m
Delta
Deal found 1/26$772
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/171:55 pm
SFO
-
SOU
1 stop19h 10m
Delta
Wed 3/45:35 pm
SOU
-
SFO
1 stop26h 15m
Delta
Deal found 1/26$773
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/161:25 pm
SFO
-
SOU
2 stops20h 35m
Delta
Tue 3/319:05 am
SOU
-
SFO
1 stop34h 40m
Delta
Deal found 1/26$776
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/155:45 am
SFO
-
SOU
2 stops27h 20m
Delta
Thu 3/198:50 am
SOU
-
SFO
1 stop35h 00m
Delta
Deal found 1/26$777
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/171:55 pm
SFO
-
SOU
1 stop19h 10m
Delta
Mon 3/25:40 pm
SOU
-
SFO
2 stops30h 11m
Delta
Deal found 1/26$783
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/215:45 pm
SFO
-
SOU
2 stops39h 20m
Delta
Mon 3/165:40 pm
SOU
-
SFO
1 stop26h 10m
Delta
Deal found 1/26$789
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/75:50 am
SFO
-
SOU
2 stops27h 00m
Delta
Tue 4/149:05 am
SOU
-
SFO
1 stop34h 40m
Delta
Deal found 1/26$792
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/172:55 pm
SFO
-
SOU
1 stop19h 05m
Delta
Wed 4/15:20 pm
SOU
-
SFO
2 stops30h 44m
Delta
Deal found 1/26$797
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:20 am
SFO
-
SOU
2 stops26h 30m
Delta
Mon 4/135:20 pm
SOU
-
SFO
2 stops34h 00m
Delta
Deal found 1/26$801
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/161:25 pm
SFO
-
SOU
2 stops20h 35m
Delta
Wed 4/15:20 pm
SOU
-
SFO
2 stops30h 44m
Delta
Deal found 1/26$802

Find flight deals from Fremont to Portsmouth

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

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$769
(Kiwi.com)

One-way from

$324
(Delta)

Popular in

June

Cheapest in

September

Average price

$668
Provider with most accurate pricing for San Francisco-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-London (LON) flights.
Search Deals
From Fremont to Portsmouth
Search Deals
One-way flight from Fremont to Portsmouth
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($155 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($27 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 Portsmouth 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 Portsmouth that are best for you.

Fly from

Fremont

Fly to

Portsmouth

Route

Depart

Return

Price

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Sun 2/15

1:55 pm-8:50 am

1 stop34h 55m

Southampton Eastleigh

Thu 3/19

8:50 am-12:50 pm

1 stop35h 00m

$773

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Wed 2/18

1:55 pm-5:05 pm

1 stop19h 10m

Southampton Eastleigh

Wed 3/4

5:35 pm-11:50 am

1 stop26h 15m

$773

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Tue 2/17

1:55 pm-8:25 am

1 stop34h 30m

Southampton Eastleigh

Tue 3/17

5:35 pm-12:50 pm

1 stop26h 15m

$773

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Tue 2/17

10:20 am-5:05 pm

2 stops22h 45m

Southampton Eastleigh

Thu 3/5

6:05 pm-11:50 am

1 stop25h 45m

$777

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Wed 2/18

6:05 am-8:25 am

2 stops18h 20m

Southampton Eastleigh

Thu 3/19

8:50 am-12:50 pm

1 stop35h 00m

$777

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Wed 2/18

11:02 am-5:05 pm

2 stops22h 03m

Southampton Eastleigh

Thu 3/5

8:50 am-11:50 am

1 stop35h 00m

$777

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Tue 2/17

5:45 am-5:05 pm

2 stops27h 20m

Southampton Eastleigh

Wed 3/4

5:35 pm-11:50 am

1 stop26h 15m

$777

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Mon 2/16

7:00 am-5:05 pm

2 stops26h 05m

Southampton Eastleigh

Wed 3/18

5:35 pm-12:50 pm

1 stop26h 15m

$777

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Mon 2/16

10:55 pm-8:50 am

2 stops25h 55m

Southampton Eastleigh

Wed 3/4

8:50 am-11:50 am

1 stop35h 00m

$777

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Mon 2/16

7:00 am-5:05 pm

2 stops26h 05m

Southampton Eastleigh

Thu 3/5

8:50 am-11:50 am

1 stop35h 00m

$777

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 17 results
1
2

Best time to book a flight from Fremont to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth 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 Portsmouth

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

Currently, October is the cheapest month in which you can book a flight from Fremont to Portsmouth (average of $497). Flying from Fremont to Portsmouth in June is currently the most expensive (average of $803). 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 P0R?

Find hourly flight availability from Fremont to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 28, 2026.

A simple way to save on the total cost of your ticket is to fly from Fremont to Portsmouth in the morning. If you’re flexible enough to do this you can expect to save up to 12% on your trip compared to booking a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from Fremont to Portsmouth. Price data was last updated on January 24, 2026.

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

Weekly flight availability from Fremont to Portsmouth

Explore weekly flight availability from Fremont to Portsmouth. 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 January 28, 2026.

The most flights from FR8 to P0R are scheduled on a Monday (31 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (25 on average).

Reviews of airlines servicing Portsmouth

Get insights into the airlines that provide service to Portsmouth. 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 Portsmouth. Reviews last updated January 28, 2026.
Read reviews from past customers who have flown Aer Lingus from Fremont to Portsmouth. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,442 reviews

Comfort

7.1

Crew

8.0

Boarding

7.4

Entertainment

6.9

Food

6.6

Overall

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
Aer Lingus
7.2
Good
1,442 reviews
Aer Lingus
7.2
Good
1,442 reviews

Comfort

7.1

Crew

8.0

Boarding

7.4

Entertainment

6.9

Food

6.6

Overall

7.2

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

DUB - EDI

Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.

Related info for your journey

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

    Departing from Fremont to Portsmouth will take you 34h 55m. Airlines will cover a distance of 5349 mi.

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

    The top 3 most reliable airlines when flying from Fremont to Portsmouth are American Airlines (82%), Aer Lingus (82%) and Alaska Airlines (82%).

  • What are the cheapest flights from Fremont to Portsmouth?

    The cheapest flight price from Fremont to Portsmouth is $250. On average you can expect to pay $2,610. The most popular route, (San Francisco - Southampton Eastleigh), can usually be booked for $769.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Fremont to Portsmouth (average of $497). Flying from Fremont to Portsmouth in June is currently the most expensive (average of $803). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Fremont to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Heathrow flights
San Francisco to Heathrow flights
Los Angeles to Gatwick flights
San Francisco to Gatwick flights
Los Angeles to Stansted flights
Los Angeles to London City flights
San Francisco to London City flights
San Francisco to Stansted flights
San Diego to Heathrow flights
Ontario to Heathrow flights
Las Vegas to Heathrow flights
Los Angeles to Luton flights
San Francisco to Luton flights
San Diego to Gatwick flights
Los Angeles to Edinburgh flights
Santa Ana to Heathrow flights
San Francisco to Edinburgh flights
San Jose to Heathrow flights
Las Vegas to Gatwick flights
San Diego to London City flights
Sacramento to Heathrow flights
Los Angeles to Manchester flights
San Diego to Stansted flights
Las Vegas to London City flights
Oakland to Heathrow flights
Las Vegas to Stansted flights
San Jose to Gatwick flights
San Francisco to Manchester flights
Sacramento to Gatwick flights
Sacramento to London City flights
Ontario to Edinburgh flights
Sacramento to Edinburgh flights
Oakland to Gatwick flights
Santa Ana to Edinburgh flights
Burbank to Heathrow flights
Reno to Heathrow flights
Santa Ana to Manchester flights
Burbank to Manchester flights
San Francisco to Southampton flights
San Jose to Edinburgh flights
Ontario to Gatwick flights
Palm Springs to Heathrow flights
San Diego to Edinburgh flights
Santa Rosa to Heathrow flights
Burbank to Gatwick flights
Ontario to Manchester flights
San Jose to Manchester flights
San Jose to London City flights
Reno to London City flights
Reno to Gatwick flights

Top 10 airlines flying from Fremont to Portsmouth

Discover the top 10 airlines that operate flights from Fremont to Portsmouth. 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
JetBlueCheapest$151Average$854FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$334Average$634FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$339Average$536FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$494Average$655FlexibilityNo cancel feeOn-time75%
SWISSCheapest$513Average$703FlexibilityNo cancel feeOn-time79%
British AirwaysCheapest$514Average$770FlexibilityNo cancel feeOn-time70%
DeltaCheapest$521Average$766FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$561Average$685FlexibilityNo cancel feeOn-time76%
Virgin AtlanticCheapest$566Average$830FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$568Average$840FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
Cookie settings©2026 Cheapflights