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Portsmouth

$733+ Cheap flights from Baltimore (BWI) to Portsmouth, England

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/18. Fares are subject to change and may not be available on all flights or dates of travel.
BWI — LHR
Mar 5 — Mar 121
Thu 3/5
Thu 3/12
1 adult, Economy
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Cheap flight deals from Baltimore to Portsmouth

Cheapest flights from Baltimore to Portsmouth
Explore the most affordable flight options available from Baltimore to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.

This Mytrip deal was found by Cheapflights users on 2/1. 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.
Wed 3/188:40 pm
BWI
-
SOU
2 stops16h 40m
Multiple Airlines
Wed 3/259:25 am
SOU
-
BWI
2 stops14h 15m
Multiple Airlines
Deal found 2/1$733
This Delta deal was found by Cheapflights users on 2/1. 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 8/291:00 pm
BWI
-
SOU
2 stops14h 45m
Delta
Mon 9/79:05 am
SOU
-
BWI
2 stops18h 08m
Delta
Deal found 2/1$928
This Mytrip deal was found by Cheapflights users on 2/2. 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.
Sat 5/2311:20 pm
BWI
-
SOU
2 stops13h 30m
Multiple Airlines
Thu 5/289:10 am
SOU
-
BWI
2 stops15h 15m
Multiple Airlines
Deal found 2/2$1,154
This KLM deal was found by Cheapflights users on 2/2. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1910:52 am
BWI
-
SOU
2 stops17h 28m
KLM
Wed 4/85:20 pm
SOU
-
BWI
2 stops28h 29m
KLM
Deal found 2/2$1,184
This Ovago deal was found by Cheapflights users on 2/1. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/199:35 pm
BWI
-
SOU
2 stops16h 55m
Multiple Airlines
Thu 3/267:00 pm
SOU
-
BWI
2 stops28h 45m
Multiple Airlines
Deal found 2/1$1,236
This Mytrip deal was found by Cheapflights users on 2/2. 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.
Thu 3/198:40 pm
BWI
-
SOU
2 stops16h 30m
Multiple Airlines
Wed 4/87:55 pm
SOU
-
BWI
3 stops28h 30m
Multiple Airlines
Deal found 2/2$1,265
This KLM deal was found by Cheapflights users on 2/1. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/291:00 pm
BWI
-
SOU
2 stops14h 45m
KLM
Mon 8/315:20 pm
SOU
-
BWI
2 stops27h 31m
KLM
Deal found 2/1$1,339

Find flight deals from Baltimore to Portsmouth

Keep the following information in mind while searching for Baltimore to Portsmouth flight deals. Data was last updated February 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$733
(Mytrip)

Popular in

June

Cheapest in

September

Average price

$643
Provider with most accurate pricing for Washington, D.C. (WAS)-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-London (LON) flights.
Search Deals
From Baltimore/Washington to Portsmouth
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($95 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Baltimore 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 February 3, 2026.
Use the filters below to find and compare flights from Baltimore to Portsmouth that are best for you.

Fly from

Baltimore

Fly to

Portsmouth

Route

Depart

Return

Price

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

Wed 3/18

8:40 pm-5:20 pm

2 stops16h 40m

Southampton Eastleigh

Wed 3/25

9:25 am-7:40 pm

2 stops14h 15m

$733

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

Sat 5/23

11:20 pm-5:50 pm

2 stops13h 30m

Southampton Eastleigh

Thu 5/28

9:10 am-7:25 pm

2 stops15h 15m

$1,154

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

Thu 3/19

10:52 am-8:20 am

2 stops17h 28m

Southampton Eastleigh

Wed 4/8

5:20 pm-4:49 pm

2 stops28h 29m

$1,184

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

Thu 3/19

9:35 pm-6:30 pm

2 stops16h 55m

Southampton Eastleigh

Thu 3/26

7:00 pm-7:45 pm

2 stops28h 45m

$1,236

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

Thu 3/19

8:40 pm-5:10 pm

2 stops16h 30m

Southampton Eastleigh

Wed 4/8

7:55 pm-7:25 pm

3 stops28h 30m

$1,265

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

Fri 5/22

11:51 am-8:45 am

2 stops15h 54m

Southampton Eastleigh

Sun 5/31

9:15 am-11:17 pm

2 stops19h 02m

$1,542

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

Fri 6/12

9:30 pm-7:30 pm

2 stops17h 00m

Southampton Eastleigh

Sun 6/21

8:55 am-7:45 pm

2 stops15h 50m

$1,794

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

Thu 6/11

6:10 pm-4:50 pm

2 stops17h 40m

$807

BaltimoreSouthampton

BWI - SOU

BWISOU

Baltimore/Washington

Thu 6/11

1:00 pm-8:35 am

2 stops14h 35m

$807

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

Best time to book a flight from Baltimore to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Baltimore with our price prediction graph.
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 Baltimore to Portsmouth

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

Currently, March is the cheapest month in which you can book a flight from Baltimore to Portsmouth (average of $31). Flying from Baltimore to Portsmouth in June is currently the most expensive (average of $720). 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 BWI to P0R?

Find hourly flight availability from Baltimore 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 February 3, 2026.

When flying from Baltimore 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.

Related info for your journey

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

    Baltimore/Washington (BWI), located 8.5 mi from the city center, is the airport you fly out of when you book flights from Baltimore to Portsmouth. 9 airlines have flights from Baltimore/Washington to Portsmouth on a regular basis. Booking flights from Baltimore/Washington to Portsmouth should not be difficult; the airport handles an average of 0 outbound flights to Portsmouth per day.

  • How long is the flight from Baltimore to Portsmouth?

    For as low as $1,184, KLM can have you in Portsmouth from Baltimore in 17h 28m. There are 3597 mi between Baltimore and Portsmouth.

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

    Consider American Airlines (78%), Aer Lingus (78%) or Finnair (78%) when booking your flight. These represent the most reliable airlines when flying from Baltimore to Portsmouth.

  • What are the cheapest flights from Baltimore to Portsmouth?

    The cheapest flight price from Baltimore to Portsmouth is $256. On average you can expect to pay $1,515. The most popular route, (Baltimore/Washington - Southampton Eastleigh), can usually be booked for $733.

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from Baltimore to Portsmouth (average of $31). Flying from Baltimore to Portsmouth in June is currently the most expensive (average of $720). 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 Baltimore to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from Baltimore to Portsmouth

Discover the top 9 airlines that operate flights from Baltimore 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 February 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest$374Average$530FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$462Average$905FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$471Average$715FlexibilityNo cancel feeOn-time72%
IcelandairCheapest$479Average$641FlexibilityNo cancel feeOn-time76%
IberiaCheapest$584Average$764FlexibilityNo cancel feeOn-time77%
FinnairCheapest$585Average$740FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$606Average$804FlexibilityNo cancel feeOn-time70%
DeltaCheapest$609Average$873FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$621Average$839FlexibilityNo cancel feeOn-time71%

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