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Cheap flights from Portsmouth to the United States from £327

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 20/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LAX
27 May — 3 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap 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 27 April 2026.

Tue 26/509:20
SOU
-
JFK
3 stops35h 20m
Multiple Airlines
Tue 2/618:55
JFK
-
SOU
2 stops19h 35m
Multiple Airlines
Deal found 26/4£539
Sat 6/609:20
SOU
-
BOS
1 stop14h 30m
Aer Lingus
Sat 13/617:25
BOS
-
SOU
1 stop10h 10m
Aer Lingus
Deal found 22/4£542
Tue 9/609:20
SOU
-
JFK
1 stop18h 05m
Aer Lingus
Tue 16/621:05
JFK
-
SOU
1 stop17h 25m
Aer Lingus
Deal found 25/4£554
Mon 8/609:20
SOU
-
JFK
3 stops35h 20m
Multiple Airlines
Mon 15/618:55
JFK
-
SOU
2 stops19h 35m
Multiple Airlines
Deal found 23/4£557
Mon 8/609:20
SOU
-
BOS
1 stop14h 30m
Aer Lingus
Mon 15/621:15
BOS
-
SOU
1 stop14h 35m
Aer Lingus
Deal found 24/4£559
Thu 7/517:20
SOU
-
JFK
1 stop25h 20m
British Airways
Mon 11/523:55
JFK
-
SOU
1 stop14h 35m
British Airways
Deal found 23/4£566
Mon 8/609:20
SOU
-
EWR
2 stops34h 39m
Multiple Airlines
Mon 15/617:45
EWR
-
SOU
2 stops20h 45m
Multiple Airlines
Deal found 23/4£567
Mon 4/509:20
SOU
-
EWR
2 stops32h 55m
Multiple Airlines
Sun 17/517:45
EWR
-
SOU
2 stops20h 45m
Multiple Airlines
Deal found 22/4£567
Mon 4/509:20
SOU
-
JFK
1 stop15h 00m
British Airways
Sun 17/523:55
JFK
-
SOU
1 stop14h 35m
British Airways
Deal found 22/4£573
Mon 1/609:20
SOU
-
EWR
2 stops34h 39m
Multiple Airlines
Sun 7/617:45
EWR
-
SOU
2 stops20h 45m
Multiple Airlines
Deal found 26/4£575
Tue 26/509:20
SOU
-
EWR
3 stops32h 55m
Multiple Airlines
Tue 2/617:15
EWR
-
SOU
2 stops21h 15m
Multiple Airlines
Deal found 26/4£578
Tue 9/609:20
SOU
-
MCO
1 stop13h 55m
Aer Lingus
Tue 16/619:59
MCO
-
SOU
1 stop15h 51m
Aer Lingus
Deal found 25/4£580

Find flight deals from Portsmouth to USA

Keep the following information in mind while searching for Portsmouth to USA flight deals. Data was last updated 27 April 2026.

Round-trip from

£539

One-way from

£327

Popular in

July

Cheapest in

September

Average price

£450
26/5-2/6
  • 26/5-2/6
  • 5 total stops
  • 54h 55m total
  • Portsmouth to USA
Search Deals
20/6
  • 20/6
  • 1 total stop
  • 29h 55m total
  • Portsmouth to USA
Search Deals
Highest demand for flights based on searches. 6% 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 April 2026
Search Deals

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 27 April 2026.
Use the filters below to find and compare flights from Portsmouth to the United States that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Sat 6/6

09:20-18:50

1 stop14h 30m

Boston Logan Intl

Sat 13/6

17:25-08:35

1 stop10h 10m

£542

SouthamptonNew York

SOU - JFK

SOUJFK

Southampton Eastleigh

Thu 7/5

20:00-19:20

1 stop28h 20m

New York John F Kennedy Intl

Mon 11/5

23:55-19:30

1 stop14h 35m

£568

SouthamptonNew York

SOU - JFK

SOUJFK

Southampton Eastleigh

Tue 26/5

09:05-12:24

1 stop32h 19m

New York John F Kennedy Intl

Tue 2/6

21:15-08:35

1 stop30h 20m

£635

SouthamptonNew York

SOU - LGA

SOULGA

Southampton Eastleigh

Tue 26/5

09:05-21:02

2 stops16h 57m

New York LaGuardia

Tue 2/6

11:54-08:35

2 stops15h 41m

£655

SouthamptonNew York

SOU - LGA

SOULGA

Southampton Eastleigh

Mon 29/6

09:05-22:00

2 stops17h 55m

New York LaGuardia

Tue 21/7

13:00-08:45

2 stops14h 45m

£671

SouthamptonNew York

SOU - LGA

SOULGA

Southampton Eastleigh

Mon 29/6

09:05-22:00

2 stops17h 55m

New York LaGuardia

Thu 23/7

13:00-08:45

2 stops14h 45m

£671

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Wed 10/6

09:20-17:10

1 stop15h 50m

Seattle/Tacoma Intl

Wed 17/6

19:10-19:30

1 stop16h 20m

£683

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 1/6

19:20-14:40

2 stops24h 20m

Miami

Wed 17/6

16:40-08:45

2 stops35h 05m

£684

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sun 6/9

17:20-11:50

1 stop26h 30m

Los Angeles Los Angeles

Wed 16/9

13:50-08:35

1 stop34h 45m

£687

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Tue 8/9

17:20-11:50

1 stop26h 30m

Los Angeles Los Angeles

Wed 23/9

16:45-08:35

1 stop31h 50m

£689

Flights are sorted by cheapest return flights first.

Deals found on 23/4

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
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6

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 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 27 April 2026.

A simple way to save on the total cost of your ticket is to fly from Portsmouth to USA in the morning. If you’re flexible enough to do this you can expect to save up to 10% on your trip compared to booking a flight in the afternoon.

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 25 April 2026.

Travellers seeking maximum savings on their Portsmouth to USA flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday 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 27 April 2026.

The most flights from P0R to US0 are scheduled on a Sunday (55 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (48 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 27 April 2026.
Get a feel of what it's like to fly with Aer 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.
Aer Lingus
7.3
Good
1,533 reviews
Check prices

Overall

7.3

Food

6.6

Boarding

7.4

Crew

8.1

Entertainment

7.0

Comfort

7.2

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.
Aer Lingus
7.3
Good
1,533 reviews
Aer Lingus
7.3
Good
1,533 reviews
Check prices

Overall

7.3

Food

6.6

Boarding

7.4

Crew

8.1

Entertainment

7.0

Comfort

7.2

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.

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 Aer Lingus, British Airways, and KLM fly from Portsmouth to USA in about 14h 30m. The time it takes to get you to your destination can typically vary by up to 17h 49m. There are 3228 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 - San Francisco or Southampton Eastleigh - Los Angeles Los Angeles 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 Malaysia Airlines (87%), SriLankan Airlines (86%) and Fiji Airways (85%).

  • What are the cheapest flights from Portsmouth to USA?

    While on average a flight from Portsmouth to USA is generally £2,174, our data shows the cheapest flight currently is £410. When looking at the most popular route, (Southampton Eastleigh - New York John F Kennedy Intl), you can expect to pay £554 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.

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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Stansted to Vancouver Intl flights
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Heathrow to Reagan-National flights

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 27 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest£74Average£110FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
Air CanadaCheapest£116Average£537FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
DeltaCheapest£147Average£591FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
IberiaCheapest£236Average£595FlexibilityNo cancel feeOn-time77%
Search Iberia flights
SWISSCheapest£244Average£473FlexibilityNo cancel feeOn-time79%
Search SWISS flights
JetBlueCheapest£257Average£590FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
IcelandairCheapest£281Average£469FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
TAP AIR PORTUGALCheapest£294Average£476FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesCheapest£297Average£512FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Aer LingusCheapest£300Average£651FlexibilityNo 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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