$355+ Cheap flights from Boston (BOS) 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 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — LHR
Sep 17 — Sep 241
Round-trip
1 adult, Economy
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Find cheap flights from Boston to Portsmouth with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Boston to Portsmouth
Cheapest
Best
Last-minute
One-way
Cheapest flights from Boston to PortsmouthExplore the most affordable flight options available from Boston to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2026.
Explore the most affordable flight options available from Boston to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2026.
This Trip.com deal was found by Cheapflights users on 8/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2811:00 pm -
2 stops15h 30m
Mon 10/59:20 am -
2 stops14h 30m
Deal found 8/14![Multiple Airlines logo]()
$787
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Sun 9/279:15 pm -
1 stop14h 35m
Sun 10/49:20 am -
2 stops35h 50m
Deal found 8/13![Aer Lingus logo]()
$795
This Trip.com deal was found by Cheapflights users on 8/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:25 pm -
1 stop10h 15m
Mon 10/59:20 am -
1 stop14h 30m
Deal found 8/14![Aer Lingus logo]()
$838
This Mytrip deal was found by Cheapflights users on 8/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:25 pm -
1 stop18h 25m
Tue 9/229:15 am -
1 stop14h 35m
Deal found 8/16![Aer Lingus logo]()
$842
This Mytrip deal was found by Cheapflights users on 8/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/143:35 pm -
2 stops22h 55m
Mon 9/218:00 pm -
2 stops27h 07m
Deal found 8/17![Multiple Airlines logo]()
$858
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Sat 10/175:25 pm -
2 stops11h 00m
Wed 1/69:20 am -
1 stop14h 39m
Deal found 8/13![Multiple Airlines logo]()
$872
This Mytrip deal was found by Cheapflights users on 8/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/275:50 am -
2 stops30h 00m
Sun 10/48:25 am -
3 stops40h 55m
Deal found 8/13![Multiple Airlines logo]()
$890
This Kiwi.com deal was found by Cheapflights users on 8/16. 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.
Tue 9/159:15 pm -
1 stop14h 35m
Tue 9/225:20 pm -
2 stops32h 45m
Deal found 8/16![Multiple Airlines logo]()
$935
Best flights from Boston to PortsmouthDiscover carefully curated flight deals from Boston to Portsmouth that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 18, 2026.
Discover carefully curated flight deals from Boston to Portsmouth that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 18, 2026.
This Mytrip deal was found by Cheapflights users on 8/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/143:35 pm -
2 stops22h 55m
Mon 9/218:00 pm -
2 stops27h 07m
Deal found 8/17![Multiple Airlines logo]()
$858
This Cheapflightsfares deal was found by Cheapflights users on 8/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/145:25 pm -
1 stop10h 15m
Mon 9/219:20 am -
1 stop14h 30m
Deal found 8/17![Aer Lingus logo]()
$1,119
This Delta deal was found by Cheapflights users on 8/13. 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 10/177:30 pm -
2 stops40h 20m
Wed 1/65:30 pm -
2 stops26h 52m
Deal found 8/13![Delta logo]()
$1,149
This Kiwi.com deal was found by Cheapflights users on 8/15. 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.
Tue 9/295:25 pm -
2 stops11h 50m
Tue 10/69:15 am -
1 stop10h 40m
Deal found 8/15![Multiple Airlines logo]()
$859
This Mytrip deal was found by Cheapflights users on 8/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/275:50 am -
2 stops30h 00m
Sun 10/48:25 am -
3 stops40h 55m
Deal found 8/13![Multiple Airlines logo]()
$890
This Cheapflightsfares deal was found by Cheapflights users on 8/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/69:15 pm -
1 stop17h 15m
Sun 10/189:20 am -
1 stop10h 35m
Deal found 8/13![Aer Lingus logo]()
$1,120
This Delta deal was found by Cheapflights users on 8/13. 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 9/94:40 pm -
1 stop10h 55m
Wed 9/165:20 pm -
1 stop28h 15m
Deal found 8/13![Delta logo]()
$1,171
This Delta deal was found by Cheapflights users on 8/13. 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 9/98:25 pm -
1 stop15h 25m
Thu 9/179:05 am -
1 stop12h 30m
Deal found 8/13![Delta logo]()
$1,171
This Delta deal was found by Cheapflights users on 8/16. 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 9/84:40 pm -
1 stop11h 05m
Fri 9/189:05 am -
1 stop12h 30m
Deal found 8/16![Delta logo]()
$1,171
Last-minute flights from Boston to PortsmouthDiscover last-minute flight deals from Boston to Portsmouth. Data last updated August 18, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to Portsmouth. Data last updated August 18, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 8/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/143:35 pm -
2 stops22h 55m
Mon 9/218:00 pm -
2 stops27h 07m
Deal found 8/17![Multiple Airlines logo]()
$858
This Mytrip deal was found by Cheapflights users on 8/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:25 pm -
1 stop18h 25m
Tue 9/229:15 am -
1 stop14h 35m
Deal found 8/16![Aer Lingus logo]()
$842
This Kiwi.com deal was found by Cheapflights users on 8/16. 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.
Tue 9/159:15 pm -
1 stop14h 35m
Tue 9/225:20 pm -
2 stops32h 45m
Deal found 8/16![Multiple Airlines logo]()
$935
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Sun 9/279:15 pm -
1 stop14h 35m
Sun 10/49:20 am -
2 stops35h 50m
Deal found 8/13![Aer Lingus logo]()
$795
This Mytrip deal was found by Cheapflights users on 8/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/275:50 am -
2 stops30h 00m
Sun 10/48:25 am -
3 stops40h 55m
Deal found 8/13![Multiple Airlines logo]()
$890
This Trip.com deal was found by Cheapflights users on 8/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2811:00 pm -
2 stops15h 30m
Mon 10/59:20 am -
2 stops14h 30m
Deal found 8/14![Multiple Airlines logo]()
$787
This Trip.com deal was found by Cheapflights users on 8/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:25 pm -
1 stop10h 15m
Mon 10/59:20 am -
1 stop14h 30m
Deal found 8/14![Aer Lingus logo]()
$838
One-way flights from Boston to PortsmouthSearch for one-way flight options from Boston to Portsmouth. Find affordable one-way fares based on user searches. Data last updated August 18, 2026.
Search for one-way flight options from Boston to Portsmouth. Find affordable one-way fares based on user searches. Data last updated August 18, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/15. 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.
Sat 11/77:50 pm -
3 stops39h 45m
Deal found 8/15![Multiple Airlines logo]()
$355
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Sun 11/87:50 pm -
2 stops18h 40m
Deal found 8/13![Multiple Airlines logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 8/15. 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.
Sun 11/85:50 pm -
1 stop9h 50m
Deal found 8/15![Aer Lingus logo]()
$365
This Kiwi.com deal was found by Cheapflights users on 8/15. 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.
Sat 11/79:20 pm -
1 stop14h 15m
Deal found 8/15![Aer Lingus logo]()
$384
This KAYAK deal was found by Cheapflights users on 8/15. 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.
Fri 10/25:25 pm -
1 stop18h 25m
Deal found 8/15![Aer Lingus logo]()
$519
This KAYAK deal was found by Cheapflights users on 8/16. 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.
Thu 9/249:15 pm -
1 stop30h 25m
Deal found 8/16![Aer Lingus logo]()
$553
This Delta deal was found by Cheapflights users on 8/13. 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.
Mon 8/244:45 pm -
1 stop11h 00m
Deal found 8/13![Delta logo]()
$573
Find flight deals from Boston to Portsmouth
Keep the following information in mind while searching for Boston to Portsmouth flight deals. Data was last updated August 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $787 (Trip.com) |
One-way from | $355 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $735 |
Cheapflights Fare Finder
Customize your flight search to find flights from Boston 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 August 18, 2026.
Use the filters below to find and compare flights from Boston to Portsmouth that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Mon 9/14
3:35 pm-7:30 pm
2 stops22h 55m
Southampton Eastleigh
Mon 9/21
8:00 pm-6:07 pm
2 stops27h 07m
$858
Quickest round-trip
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Tue 9/29
5:25 pm-10:15 am
2 stops11h 50m
Southampton Eastleigh
Tue 10/6
9:15 am-2:55 pm
1 stop10h 40m
$859
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Sun 9/27
5:50 am-4:50 pm
2 stops30h 00m
Southampton Eastleigh
Sun 10/4
8:25 am-8:20 pm
3 stops40h 55m
$890
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Mon 9/14
5:25 pm-8:40 am
1 stop10h 15m
Southampton Eastleigh
Mon 9/21
9:20 am-6:50 pm
1 stop14h 30m
$1,119
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Tue 10/6
9:15 pm-7:30 pm
1 stop17h 15m
Southampton Eastleigh
Sun 10/18
9:20 am-2:55 pm
1 stop10h 35m
$1,120
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Sat 10/17
7:30 pm-4:50 pm
2 stops40h 20m
Southampton Eastleigh
Wed 1/6
5:30 pm-3:22 pm
2 stops26h 52m
$1,149
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Wed 9/9
4:40 pm-8:35 am
1 stop10h 55m
Southampton Eastleigh
Wed 9/16
5:20 pm-4:35 pm
1 stop28h 15m
$1,171
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Wed 9/9
8:25 pm-4:50 pm
1 stop15h 25m
Southampton Eastleigh
Thu 9/17
9:05 am-4:35 pm
1 stop12h 30m
$1,171
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Tue 9/8
4:40 pm-8:45 am
1 stop11h 05m
Southampton Eastleigh
Fri 9/18
9:05 am-4:35 pm
1 stop12h 30m
$1,171
Cheapest one-way
BostonSouthampton
BOS Boston Logan Intl - SOU Southampton Eastleigh
BOSSOU
Boston Logan Intl
Sat 11/7
7:50 pm-4:35 pm
3 stops39h 45m
$355
Showing 1-10 of 16 resultsSorted by cheapest first
Best time to book a flight from Boston to Portsmouth
Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Boston with our price prediction graph.
BOS-SOU
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 Boston to Portsmouth
BOS-P0R
BOS-SOU
What is the cheapest time of day to fly from BOS to P0R?
Find hourly flight availability from Boston 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 August 18, 2026.
When flying from Boston to Portsmouth, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Weekly flight availability from Boston to Portsmouth
Explore weekly flight availability from Boston to Portsmouth. 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 August 18, 2026.
The most flights from BOS to P0R are scheduled on a Tuesday (39 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (34 on average).
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 August 18, 2026.
See what other customers who have flown with Aer Lingus from Boston to Portsmouth have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.3
Boarding
7.5
Food
6.7
Crew
8.1
Entertainment
7.0
Comfort
7.2
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
BOS - SNN
Overall
7.3
Boarding
7.5
Food
6.7
Crew
8.1
Entertainment
7.0
Comfort
7.2
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
BOS - SNN
Related info for your journey
Find useful and relevant information for your journey from Boston to Portsmouth. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Complete your trip
Complete your trip to Portsmouth by adding a car rental and/or hotel reservation to your travel itinerary.
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Boston and Portsmouth flights
Browse other Boston and Portsmouth flight options. Last updated on August 18, 2026.
Other flights from Boston
Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on August 18, 2026.
Popular flight searches
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Boston to Portsmouth flights
Consider these flights traveling from Boston to Portsmouth.
Top 10 airlines flying from Boston to Portsmouth
Discover the top 10 airlines that operate flights from Boston 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 August 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$352 | Average$885 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$417 | Average$761 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$425 | Average$454 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$433 | Average$748 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$441 | Average$659 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$463 | Average$791 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$466 | Average$703 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$470 | Average$684 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$479 | Average$742 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$481 | Average$697 | FlexibilityNo cancel fee | On-time77% |