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Portsmouth

$475+ Cheap flights from San Francisco (SFO) 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 11/30. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — LHR
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap flight deals from San Francisco to Portsmouth

Keep the following information in mind while searching for San Francisco to Portsmouth flight deals. Data was last updated October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$769
(Delta)

One-way from

$475
(Delta)

Popular in

June

Cheapest in

September

Average price

$665
Provider with most accurate pricing for San Francisco-London (LON) flight deals.
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Provider most trusted by Cheapflights users for San Francisco-London (LON) flights.
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From San Francisco to Portsmouth
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One-way flight from San Francisco to Portsmouth
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Highest demand for flights based on searches. 16% potential increase in price ($149 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from San Francisco to Portsmouth

Cheapest flights from San Francisco to Portsmouth
Explore the most affordable flight options available from San Francisco to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

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 12/1610:30 amSFO - SOU
2 stops37h 50mDelta
Wed 1/79:25 amSOU - SFO
2 stops41h 18mDelta
Deal found 10/28$913
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 12/161:55 pmSFO - SOU
1 stop19h 05mDelta
Tue 1/65:30 pmSOU - SFO
2 stops32h 48mDelta
Deal found 10/28$1,000
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.
Thu 12/117:00 amSFO - SOU
2 stops28h 20mMultiple Airlines
Thu 12/188:10 pmSOU - SFO
1 stop27h 25mMultiple Airlines
Deal found 10/28$1,066
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/135:20 pmSFO - SOU
1 stop31h 25mAer Lingus
Mon 12/228:10 pmSOU - SFO
1 stop27h 25mAer Lingus
Deal found 10/30$1,087
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1111:15 pmSFO - SOU
2 stops25h 30mAer Lingus
Thu 12/189:30 amSOU - SFO
2 stops21h 28mAer Lingus
Deal found 10/28$1,099
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.
Wed 12/177:15 amSFO - SOU
2 stops17h 05mDelta
Wed 1/79:25 amSOU - SFO
2 stops40h 18mDelta
Deal found 10/28$1,254
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2210:45 pmSFO - SOU
2 stops25h 25mDelta
Tue 12/308:40 amSOU - SFO
1 stop35h 10mDelta
Deal found 10/30$1,328
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2210:45 pmSFO - SOU
2 stops25h 25mDelta
Wed 12/318:40 amSOU - SFO
2 stops46h 21mDelta
Deal found 10/30$1,339
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 12/1610:30 amSFO - SOU
2 stops37h 50mDelta
Sun 1/46:05 pmSOU - SFO
2 stops37h 03mDelta
Deal found 10/28$1,390

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco 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 October 30, 2025.
Use the filters below to find and compare flights from San Francisco to Portsmouth that are best for you.

Fly from

San Francisco

Fly to

Portsmouth

Route

Depart

Return

Price

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Wed 2/11

1:55 pm-5:00 pm

1 stop19h 05m

Southampton Eastleigh

Thu 2/19

9:00 am-11:50 am

1 stop34h 50m

$769

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Tue 2/10

1:55 pm-5:00 pm

1 stop19h 05m

Southampton Eastleigh

Mon 2/23

5:30 pm-11:50 am

1 stop26h 20m

$769

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Wed 2/18

1:55 pm-8:25 am

1 stop34h 30m

Southampton Eastleigh

Mon 2/23

5:30 pm-11:50 am

1 stop26h 20m

$769

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Tue 2/10

1:55 pm-5:00 pm

1 stop19h 05m

Southampton Eastleigh

Wed 2/18

5:30 pm-11:50 am

1 stop26h 20m

$769

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Sat 2/14

10:40 pm-8:50 am

2 stops26h 10m

Southampton Eastleigh

Mon 2/23

5:30 pm-11:50 am

1 stop26h 20m

$774

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Sun 2/15

7:00 am-8:50 am

2 stops17h 50m

Southampton Eastleigh

Mon 2/23

5:30 pm-11:50 am

1 stop26h 20m

$774

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Tue 2/10

10:30 am-5:00 pm

2 stops22h 30m

Southampton Eastleigh

Thu 2/19

5:30 pm-11:50 am

1 stop26h 20m

$774

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Tue 2/10

1:55 pm-5:00 pm

1 stop19h 05m

Southampton Eastleigh

Tue 2/24

8:40 am-6:15 pm

2 stops17h 35m

$779

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Sun 2/8

12:47 am-8:50 am

2 stops24h 03m

Southampton Eastleigh

Tue 2/24

8:40 am-6:15 pm

2 stops17h 35m

$784

San FranciscoSouthampton

SFO - SOU

SFOSOU

San Francisco

Sun 11/30

1:55 pm-5:25 pm

1 stop19h 30m

$475

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 17 results
1
2

Best time to book a flight from San Francisco to Portsmouth

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

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

Currently, December is the cheapest month in which you can book a flight from San Francisco to Portsmouth (average of $472). Flying from San Francisco 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 SFO to P0R?

Find hourly flight availability from San Francisco 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 October 30, 2025.

A simple way to save on the total cost of your ticket is to fly from San Francisco to Portsmouth in the afternoon. If you’re flexible enough to do this you can expect to save up to 13% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from San Francisco to Portsmouth?

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

Travelers seeking maximum savings on their San Francisco to Portsmouth flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Wednesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 30, 2025.
Get a feel of what it's like to fly with Aer Lingus from San Francisco to Portsmouth by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,361 reviews

Boarding

7.4

Crew

8.0

Overall

7.2

Food

6.6

Comfort

7.1

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
Aer Lingus
7.2
Good
1,361 reviews
Aer Lingus
7.2
Good
1,361 reviews

Boarding

7.4

Crew

8.0

Overall

7.2

Food

6.6

Comfort

7.1

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Portsmouth. 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 from for flights from San Francisco to Portsmouth?

    San Francisco (SFO), located 11.8 mi from the city center, is the airport you fly out of when you book flights from San Francisco to Portsmouth. 17 airlines have flights from San Francisco to Portsmouth on a regular basis. Booking flights from San Francisco to Portsmouth should not be difficult; the airport handles an average of 0 outbound flights to Portsmouth per day.

  • How long is the flight from San Francisco to Portsmouth?

    A quick flight from San Francisco to Portsmouth can take about 19h 05m. Delta provides one of the quickest options available for as low as $769. San Francisco and Portsmouth are separated by a distance of 5349 mi.

  • What are the most reliable airlines from San Francisco to Portsmouth?

    Consider KLM (92%), Air France (92%) or Delta (92%) when booking your flight. These represent the most reliable airlines when flying from San Francisco to Portsmouth.

  • What are the cheapest flights from San Francisco to Portsmouth?

    While on average a flight from San Francisco to Portsmouth is generally $2,575, our data shows the cheapest flight currently is $342. When looking at the most popular route, (San Francisco - Southampton Eastleigh), you can expect to pay $769 for that flight.

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

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

  • How can I find direct flights from San Francisco to Portsmouth?

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

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

    Yes. Cheapflights offers flight deals from San Francisco 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 San Francisco to Portsmouth?

    Currently, December is the cheapest month in which you can book a flight from San Francisco to Portsmouth (average of $472). Flying from San Francisco 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.

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Top 10 airlines flying from San Francisco to Portsmouth

Discover the top 10 airlines that operate flights from San Francisco 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$151Average$841FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$331Average$597FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$426Average$560FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$494Average$655FlexibilityNo cancel feeOn-time75%
SWISSCheapest$513Average$712FlexibilityNo cancel feeOn-time79%
British AirwaysCheapest$514Average$717FlexibilityNo cancel feeOn-time70%
DeltaCheapest$555Average$839FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$560Average$1,078FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$571Average$864FlexibilityNo cancel feeOn-time69%
IberiaCheapest$572Average$678FlexibilityNo cancel feeOn-time77%

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