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Cheap flights from Portsmouth to the United States from £389

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 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LAX
30 Nov — 7 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 31 October 2025.

Round-trip from

£450

One-way from

£389

Popular in

December

Cheapest in

September

Average price

£423
Virgin Atlantic
  • Virgin Atlantic
  • 3/12-10/12
  • 4 total stops
  • 40h 42m total
  • Portsmouth to USA
Search Deals
British Airways
  • British Airways
  • 12/1
  • 1 total stop
  • 14h 59m total
  • Portsmouth to USA
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£15 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 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 31 October 2025.

Wed 3/1208:40SOU - LAS
2 stops23h 47mVirgin Atlantic
Wed 10/1207:25LAS - SOU
2 stops16h 55mVirgin Atlantic
Deal found 30/10£450
Mon 10/1118:05SOU - MIA
1 stop25h 45mDelta
Mon 17/1117:15MIA - SOU
2 stops18h 45mDelta
Deal found 29/10£483
Wed 3/1208:40SOU - LAS
2 stops19h 12mDelta
Wed 10/1211:05LAS - SOU
2 stops22h 20mDelta
Deal found 30/10£485
Wed 5/1117:30SOU - MIA
2 stops28h 40mDelta
Mon 17/1112:00MIA - SOU
2 stops15h 10mDelta
Deal found 29/10£487
Wed 3/1217:30SOU - LAS
1 stop28h 45mKLM
Wed 10/1207:25LAS - SOU
2 stops16h 55mKLM
Deal found 30/10£487
Thu 11/1216:05SOU - JFK
2 stops28h 40mMultiple Airlines
Sun 14/1217:35JFK - SOU
2 stops17h 00mMultiple Airlines
Deal found 30/10£495
Wed 5/1108:40SOU - MIA
2 stops17h 11mDelta
Wed 12/1112:36MIA - SOU
2 stops14h 44mDelta
Deal found 29/10£496
Tue 9/1217:30SOU - LAX
1 stop26h 15mDelta
Tue 30/1205:30LAX - SOU
2 stops18h 40mDelta
Deal found 30/10£508
Sat 13/1217:30SOU - LAX
2 stops31h 32mDelta
Mon 29/1222:59LAX - SOU
2 stops25h 11mDelta
Deal found 30/10£512
Wed 26/1117:30SOU - LAX
1 stop26h 15mDelta
Mon 1/1223:40LAX - SOU
2 stops24h 30mDelta
Deal found 29/10£519
Fri 21/1117:30SOU - LAX
1 stop26h 15mDelta
Sun 30/1113:45LAX - SOU
1 stop34h 25mDelta
Deal found 29/10£520
Thu 27/1108:50SOU - LAX
2 stops18h 23mDelta
Sun 30/1113:45LAX - SOU
1 stop34h 25mDelta
Deal found 29/10£523

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 31 October 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

SouthamptonLas Vegas

SOU - LAS

SOULAS

Southampton Eastleigh

Wed 3/12

08:40-00:27

2 stops23h 47m

Las Vegas Harry Reid Intl

Wed 10/12

07:25-08:20

2 stops16h 55m

£450

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 10/11

08:40-14:50

1 stop35h 10m

Miami

Sun 16/11

12:36-08:10

2 stops14h 34m

£483

SouthamptonLas Vegas

SOU - LAS

SOULAS

Southampton Eastleigh

Wed 3/12

08:40-19:52

2 stops19h 12m

Las Vegas Harry Reid Intl

Wed 10/12

11:05-17:25

2 stops22h 20m

£485

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sun 9/11

09:30-23:13

2 stops18h 43m

Miami

Sun 16/11

11:27-08:10

2 stops15h 43m

£487

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 10/11

18:05-18:51

2 stops29h 46m

Miami

Mon 17/11

12:00-08:10

2 stops15h 10m

£487

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sun 9/11

09:30-23:13

2 stops18h 43m

Miami

Mon 17/11

12:00-08:10

2 stops15h 10m

£487

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Fri 27/3

08:40-19:55

1 stop15h 15m

Boston Logan Intl

Mon 30/3

13:10-08:50

2 stops14h 40m

£489

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 4/3

17:30-11:35

1 stop26h 05m

Seattle/Tacoma Intl

Sun 8/3

07:20-08:10

2 stops41h 50m

£490

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 4/3

08:40-11:35

1 stop34h 55m

Seattle/Tacoma Intl

Sun 8/3

21:55-17:00

2 stops36h 05m

£493

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 26/3

08:50-13:20

2 stops35h 30m

Los Angeles

Mon 30/3

11:20-17:00

2 stops21h 40m

£496

Flights are sorted by cheapest return flights first.

Deals found on 30/10

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 June is currently the most expensive (average of £293). 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 31 October 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 13% 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.

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 31 October 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
1,406 reviews
Check prices

Overall

7.7

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

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
1,406 reviews
KLM
7.7
Good
1,406 reviews
Check prices

Overall

7.7

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

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
671 reviews
KLM
7.7
Good
1,406 reviews
Check prices

Overall

7.7

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

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
1,363 reviews
KLM
7.7
Good
1,406 reviews
Check prices

Overall

7.7

Entertainment

7.1

Boarding

7.8

Food

7.3

Crew

8.4

Comfort

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 Virgin Atlantic, Delta, and KLM fly from Portsmouth to USA in about 12h 25m. The time it takes to get you to your destination can typically vary by up to 22h 45m. There are 3639 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 (84%), Air France (84%) and Delta (84%).

  • What are the cheapest flights from Portsmouth to USA?

    While on average a flight from Portsmouth to USA is generally £2,576, our data shows the cheapest flight currently is £350. When looking at the most popular route, (Southampton Eastleigh - New York John F Kennedy Intl), you can expect to pay £562 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 June is currently the most expensive (average of £293). 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 31 October 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest£92Average£593FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
DeltaCheapest£242Average£636FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
PLAYCheapest£273Average£387FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
TAP AIR PORTUGALCheapest£288Average£482FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Air CanadaCheapest£290Average£524FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
SWISSCheapest£297Average£462FlexibilityNo cancel feeOn-time79%
Search SWISS flights
United AirlinesCheapest£301Average£515FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Scandinavian AirlinesCheapest£302Average£512FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
IcelandairCheapest£304Average£520FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£308Average£628FlexibilityNo 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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