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Cheap flights from Portsmouth to Boston from £425

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOS
12 Oct — 19 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Portsmouth to Boston

Keep the following information in mind while searching for Portsmouth to Boston flight deals. Data was last updated 12 September 2025.

Round-trip from

£425

Popular in

December

Cheapest in

September

Average price

£389
KLM
  • KLM
  • 8/10-15/10
  • 2 total stops
  • 31h 15m total
  • Portsmouth to Boston
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£9 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 September 2025
Search Deals

Find flight deals from Portsmouth to Boston

Cheapest flights from Portsmouth to Boston
Explore the most affordable flight options available from Portsmouth to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

Wed 8/1009:20SOU - BOS
1 stop14h 00mKLM
Wed 15/1018:45BOS - SOU
1 stop17h 15mKLM
Deal found 10/9£425
Wed 8/1009:20SOU - BOS
1 stop14h 00mVirgin Atlantic
Wed 15/1020:15BOS - SOU
1 stop31h 30mVirgin Atlantic
Deal found 10/9£427
Mon 22/917:35SOU - BOS
2 stops18h 43mDelta
Mon 29/913:25BOS - SOU
2 stops14h 20mDelta
Deal found 10/9£428
Wed 8/1009:10SOU - BOS
2 stops35h 15mMultiple Airlines
Wed 15/1019:08BOS - SOU
2 stops19h 22mMultiple Airlines
Deal found 10/9£475
Sun 26/1018:05SOU - BOS
1 stop29h 50mMultiple Airlines
Sun 2/1119:10BOS - SOU
1 stop32h 00mMultiple Airlines
Deal found 11/9£526
Wed 24/1208:40SOU - BOS
1 stop15h 15mKLM
Fri 2/120:50BOS - SOU
1 stop31h 00mKLM
Deal found 11/9£566
Sun 26/1018:05SOU - BOS
2 stops23h 25mKLM
Sun 2/1120:50BOS - SOU
1 stop30h 20mKLM
Deal found 11/9£578

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Boston 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 12 September 2025.
Use the filters below to find and compare flights from Portsmouth to Boston that are best for you.

Fly from

Portsmouth

Fly to

Boston

Route

Depart

Return

Price

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Wed 8/10

09:20-18:20

1 stop14h 00m

Boston Logan Intl

Wed 15/10

18:45-17:00

1 stop17h 15m

£425

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Mon 22/9

17:35-07:18

2 stops18h 43m

Boston Logan Intl

Mon 29/9

13:25-08:45

2 stops14h 20m

£428

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Wed 8/10

09:20-07:20

2 stops27h 00m

Boston Logan Intl

Wed 15/10

20:15-08:45

1 stop31h 30m

£430

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Wed 8/10

09:10-15:25

2 stops35h 15m

Boston Logan Intl

Wed 15/10

19:08-19:30

2 stops19h 22m

£475

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Sun 26/10

18:05-19:55

1 stop29h 50m

Boston Logan Intl

Sun 2/11

19:10-08:10

1 stop32h 00m

£526

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Wed 24/12

08:40-18:55

1 stop15h 15m

Boston Logan Intl

Fri 2/1

20:50-08:50

1 stop31h 00m

£566

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Sun 26/10

18:05-13:30

2 stops23h 25m

Boston Logan Intl

Sun 2/11

20:50-08:10

1 stop30h 20m

£578

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Sat 25/10

18:05-22:00

3 stops32h 55m

Boston Logan Intl

Sat 1/11

12:35-19:40

2 stops27h 05m

£643

SouthamptonBoston

SOU - BOS

SOUBOS

Southampton Eastleigh

Thu 18/9

09:40-18:45

1 stop14h 05m

£7,911

Flights are sorted by cheapest return flights first.

Deals found on 10/9

Best time to book a flight from Portsmouth to Boston

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

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

Currently, October is the cheapest month in which you can book a flight from Portsmouth to Boston (average of £10). Flying from Portsmouth to Boston in July is currently the most expensive (average of £724). 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 BOS?

Find hourly flight availability from Portsmouth to Boston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 September 2025.

When flying from Portsmouth to Boston, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

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

Travellers seeking maximum savings on their Portsmouth to Boston flight should consider departing on Thursday mornings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Portsmouth to Boston

Explore weekly flight availability from Portsmouth to Boston. 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 12 September 2025.

The most flights from P0R to BOS are scheduled on a Monday (36 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (33 on average).

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Boston. 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 into for flights to Boston from Portsmouth?

    Most people fly into Boston Logan Intl (BOS) if they book a flight to Boston from Portsmouth. On average, Logan Intl has 0 inbound flights from Portsmouth per day from 17 airlines. Boston Logan Intl is conveniently located just 2.6 mi from Boston’s city center.

  • How long is the flight from Portsmouth to Boston?

    There are many flights that can get you from Portsmouth to Boston in 14h. Fly via KLM, Delta, or Virgin Atlantic to get the fastest option. Portsmouth and Boston are separated by a distance of 3228 mi. This flight may include one or multiple stops.

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

    The top 3 most reliable airlines when flying from Portsmouth to Boston are Scandinavian Airlines (92%), Gulf Air (92%) and KLM (87%).

  • What are the cheapest flights from Portsmouth to Boston?

    The cheapest flight price from Portsmouth to Boston is £347. On average you can expect to pay £1,316. The most popular route, (Southampton Eastleigh - Boston Logan Intl), can usually be booked for £480.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Portsmouth to Boston (average of £10). Flying from Portsmouth to Boston in July is currently the most expensive (average of £724). 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

Travelling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
Burlington
Peabody
Cambridge
Somerville
Quincy
Chelmsford

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Alternative routes for Portsmouth to Boston

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 Boston

Discover the top 10 airlines that operate flights from Portsmouth to Boston. 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 12 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£7Average£266FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
PLAYCheapest£265Average£337FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
TAP AIR PORTUGALCheapest£280Average£447FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesCheapest£297Average£451FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
IcelandairCheapest£300Average£438FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£302Average£415FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£334Average£438FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£337Average£399FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air FranceCheapest£345Average£440FlexibilityNo cancel feeOn-time77%
Search Air France flights
DeltaCheapest£347Average£535FlexibilityNo cancel feeOn-timeN/A
Search Delta 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 Boston?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Portsmouth to Boston. 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 Boston?

Cheapflights simply makes it quick and affordable to book flights from Portsmouth to Boston by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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

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

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Boston from Portsmouth today and book when prices fit your budget.

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