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Cheap flights from Portsmouth to the United States from £291

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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LAX
19 Dec — 26 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to USA

Keep the following information in mind while searching for Portsmouth to USA flight deals. Data was last updated 19 November 2025.

Round-trip from

£481

One-way from

£291

Popular in

December

Cheapest in

September

Average price

£401
Virgin Atlantic
  • Virgin Atlantic
  • 22/12-29/12
  • 2 total stops
  • 69h 25m total
  • Portsmouth to USA
Search Deals
Aer Lingus
  • Aer Lingus
  • 11/1
  • 2 total stops
  • 26h 10m total
  • Portsmouth to USA
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£19 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Find flight deals from Portsmouth to USA

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to USA
Explore the most affordable flight options available from Portsmouth to USA. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 November 2025.

Mon 22/1208:40SOU - SFO
1 stop35h 10mVirgin Atlantic
Mon 29/1213:55SFO - SOU
1 stop34h 15mVirgin Atlantic
Deal found 18/11£481
Fri 5/1217:30SOU - MIA
2 stops30h 40mDelta
Mon 8/1207:12MIA - SOU
2 stops19h 58mDelta
Deal found 18/11£482
Sat 22/1109:25SOU - MIA
2 stops18h 52mDelta
Sat 29/1107:15MIA - SOU
2 stops20h 35mDelta
Deal found 17/11£487
Mon 22/1218:05SOU - SFO
1 stop25h 45mDelta
Mon 29/1223:45SFO - SOU
2 stops33h 15mDelta
Deal found 18/11£500
Thu 4/1218:05SOU - SEA
1 stop25h 45mDelta
Sun 7/1221:59SEA - SOU
2 stops26h 11mDelta
Deal found 17/11£522
Thu 4/1218:05SOU - SFO
1 stop25h 45mDelta
Sun 18/113:55SFO - SOU
1 stop19h 10mDelta
Deal found 17/11£554
Wed 3/1217:30SOU - SFO
1 stop26h 20mDelta
Wed 14/113:55SFO - SOU
1 stop34h 30mDelta
Deal found 17/11£555
Fri 5/1217:30SOU - SFO
1 stop26h 20mDelta
Sat 17/113:55SFO - SOU
1 stop19h 20mDelta
Deal found 17/11£557
Wed 3/1217:30SOU - SFO
1 stop26h 20mDelta
Sat 17/113:55SFO - SOU
1 stop19h 20mDelta
Deal found 17/11£559
Wed 3/1217:30SOU - SFO
2 stops32h 46mDelta
Mon 19/108:00SFO - SOU
2 stops16h 50mDelta
Deal found 17/11£560
Wed 3/1217:30SOU - SFO
2 stops37h 35mDelta
Fri 16/116:05SFO - SOU
2 stops41h 10mDelta
Deal found 17/11£563
Thu 20/1108:50SOU - LAX
2 stops19h 54mDelta
Mon 1/1206:04LAX - SOU
2 stops18h 06mDelta
Deal found 17/11£566

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to USA 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 19 November 2025.
Use the filters below to find and compare flights from Portsmouth to the United States that are best for you.

Fly from

Portsmouth

Fly to

USA

Route

Depart

Return

Price

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Fri 5/12

17:30-19:10

2 stops30h 40m

Miami

Mon 8/12

07:12-08:10

2 stops19h 58m

£482

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 19/2

09:00-22:57

2 stops21h 57m

Los Angeles

Mon 23/2

06:15-08:10

2 stops17h 55m

£493

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 19/2

09:00-22:57

2 stops21h 57m

Los Angeles

Mon 23/2

09:30-17:00

2 stops23h 30m

£493

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Wed 21/1

17:35-11:50

1 stop26h 15m

San Francisco

Sun 25/1

13:55-17:00

1 stop19h 05m

£498

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Mon 22/12

18:05-11:50

1 stop25h 45m

San Francisco

Mon 29/12

23:45-17:00

2 stops33h 15m

£500

SouthamptonSan Francisco

SOU - SFO

SOUSFO

Southampton Eastleigh

Wed 21/1

09:25-23:25

2 stops22h 00m

San Francisco

Sun 25/1

07:00-08:50

2 stops17h 50m

£501

SouthamptonNew York

SOU - JFK

SOUJFK

Southampton Eastleigh

Thu 22/1

20:10-17:20

2 stops26h 10m

New York John F Kennedy Intl

Wed 28/1

18:05-19:40

2 stops20h 35m

£515

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Thu 4/12

08:50-11:50

1 stop35h 00m

Seattle/Tacoma Intl

Sun 7/12

15:05-08:10

1 stop33h 05m

£522

SouthamptonOrlando

SOU - MCO

SOUMCO

Southampton Eastleigh

Mon 12/1

09:30-18:10

1 stop13h 40m

Orlando

Mon 19/1

19:55-11:55

1 stop11h 00m

£526

SouthamptonNewark

SOU - EWR

SOUEWR

Southampton Eastleigh

Mon 12/1

09:30-16:15

1 stop11h 45m

Newark

Wed 28/1

17:45-15:35

1 stop16h 50m

£528

Flights are sorted by cheapest return flights first.

Deals found on 17/11

Showing 1-10 of 60 results
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Best time to book a flight from Portsmouth to USA

Have a flexible travel schedule? Discover the best time to fly to USA 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 the United States

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

Currently, October is the cheapest month in which you can book a flight from Portsmouth to USA (average of £92). Flying from Portsmouth to USA in December is currently the most expensive (average of £306). 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 US?

Find hourly flight availability from Portsmouth to USA. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 19 November 2025.

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

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

Use this chart to determine the cheapest time to fly return from Portsmouth to USA. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their Portsmouth to USA flight should consider departing on Wednesday evenings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Portsmouth to USA

Explore weekly flight availability from Portsmouth to USA. 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 19 November 2025.

The most flights from P0R to US0 are scheduled on a Monday (45 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (38 on average).

Reviews of airlines servicing USA

Get insights into the airlines that provide service to USA. 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 USA. Reviews last updated 19 November 2025.
Get a feel of what it's like to fly with KLM, Virgin Atlantic, andAer Lingus from Portsmouth to the United States by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,411 reviews
Check prices

Crew

8.4

Boarding

7.8

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,411 reviews
KLM
7.7
Good
1,411 reviews
Check prices

Crew

8.4

Boarding

7.8

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Virgin Atlantic
7.5
Good
673 reviews
KLM
7.7
Good
1,411 reviews
Check prices

Crew

8.4

Boarding

7.8

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Aer Lingus
7.2
Good
1,376 reviews
KLM
7.7
Good
1,411 reviews
Check prices

Crew

8.4

Boarding

7.8

Food

7.3

Comfort

7.7

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

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

    Airlines like Delta, Virgin Atlantic, and Aer Lingus fly from Portsmouth to USA in about 13h 40m. The time it takes to get you to your destination can typically vary by up to 17h. There are 4295 mi between Portsmouth and USA. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Portsmouth to USA?

    Most travelers choose Southampton Eastleigh - New York John F Kennedy Intl, Southampton Eastleigh - Newark or Southampton Eastleigh - New York LaGuardia when deciding on the best route from Portsmouth to USA.

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

    The top 3 most reliable airlines when flying from Portsmouth to USA are KLM (82%), Air Canada (82%) and Austrian Airlines (82%).

  • What are the cheapest flights from Portsmouth to USA?

    While on average a flight from Portsmouth to USA is generally £2,587, our data shows the cheapest flight currently is £351. When looking at the most popular route, (Southampton Eastleigh - New York John F Kennedy Intl), you can expect to pay £428 for that flight.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Portsmouth to USA (average of £92). Flying from Portsmouth to USA in December is currently the most expensive (average of £306). 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

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Alternative routes for Portsmouth to USA

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 USA

Discover the top 10 airlines that operate flights from Portsmouth to USA. 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 19 November 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest£92Average£595FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
DeltaCheapest£243Average£648FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
PLAYCheapest£273Average£392FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
TAP AIR PORTUGALCheapest£288Average£492FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Air CanadaCheapest£291Average£526FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
SWISSCheapest£298Average£463FlexibilityNo cancel feeOn-time79%
Search SWISS flights
United AirlinesCheapest£302Average£515FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IcelandairCheapest£304Average£521FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Scandinavian AirlinesCheapest£305Average£515FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Aer LingusCheapest£309Average£643FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus 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 USA?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Portsmouth to USA. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

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 USA from Portsmouth.

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

Yes! Cheapflights helps users easily find flights from Portsmouth to USA with no change fees.

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

Not ready to book yet? You can track prices for flights from Portsmouth to USA on Cheapflights with our Price Alert feature and get notified when better prices are available.

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