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Cheap flights from Belfast Intl Airport to Portsmouth from £26

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 18/10. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LHR
18 Oct — 25 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Belfast Intl to Portsmouth are usually found in March or January, booked 34 days in advance, depart on a Saturday or Monday and return on a Tuesday

Cheap flight deals from Belfast Intl to Portsmouth

Keep the following information in mind while searching for Belfast Intl to Portsmouth flight deals. Data was last updated 18 September 2025.

Round-trip from

£48

One-way from

£26

Popular in

June

Cheapest in

March

Average price

£119
easyJet
  • easyJet
  • 6/10-18/10
  • Nonstop
  • 2h 35m total
  • Belfast to Portsmouth
Search Deals
easyJet
  • easyJet
  • 18/10
  • Nonstop
  • 1h 15m total
  • Belfast to Portsmouth
Search Deals
Highest demand for flights based on searches. 24% potential increase in price (£23 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£4 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Belfast Intl to Portsmouth

Cheapest flights from Belfast Intl to Portsmouth
Explore the most affordable flight options available from Belfast Intl to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 September 2025.

Mon 6/1010:05BFS - SOU
Nonstop1h 15measyJet
Sat 18/1015:20SOU - BFS
Nonstop1h 20measyJet
Deal found 16/9£48
Fri 10/1010:30BFS - SOU
Nonstop1h 15measyJet
Sun 12/1012:00SOU - BFS
Nonstop1h 20measyJet
Deal found 17/9£64
Thu 2/1013:05BFS - SOU
Nonstop1h 15measyJet
Mon 6/1011:50SOU - BFS
Nonstop1h 20measyJet
Deal found 17/9£70
Fri 26/910:40BFS - SOU
Nonstop1h 15measyJet
Sat 27/915:20SOU - BFS
Nonstop1h 20measyJet
Deal found 16/9£70
Sat 4/1013:35BFS - SOU
Nonstop1h 15measyJet
Mon 13/1011:50SOU - BFS
Nonstop1h 20measyJet
Deal found 17/9£77
Thu 25/913:05BFS - SOU
Nonstop1h 15measyJet
Fri 26/912:25SOU - BFS
Nonstop1h 20measyJet
Deal found 16/9£101
Thu 2/1013:05BFS - SOU
Nonstop1h 15measyJet
Sun 5/1012:00SOU - BFS
Nonstop1h 20measyJet
Deal found 17/9£105
Thu 16/1013:05BFS - SOU
Nonstop1h 15measyJet
Thu 23/1015:05SOU - BFS
Nonstop1h 20measyJet
Deal found 16/9£114
Wed 17/1220:40BFS - SOU
1 stop20h 40measyJet
Fri 19/1217:45SOU - BFS
1 stop13h 40measyJet
Deal found 17/9£127

Cheapflights Fare Finder

 
Customise your flight search to find flights from Belfast Intl 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 858,174 searches. Data last updated 18 September 2025.
Use the filters below to find and compare flights from Belfast Intl Airport to Portsmouth that are best for you.

Fly from

Belfast Intl

Fly to

Portsmouth

Route

Depart

Return

Price

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 6/10

10:05-11:20

Nonstop1h 15m

Southampton Eastleigh

Sat 18/10

15:20-16:40

Nonstop1h 20m

£48

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Fri 10/10

10:30-11:45

Nonstop1h 15m

Southampton Eastleigh

Sun 12/10

12:00-13:20

Nonstop1h 20m

£64

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 2/10

13:05-14:20

Nonstop1h 15m

Southampton Eastleigh

Mon 6/10

11:50-13:10

Nonstop1h 20m

£70

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 4/10

13:35-14:50

Nonstop1h 15m

Southampton Eastleigh

Mon 13/10

11:50-13:10

Nonstop1h 20m

£77

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 2/10

13:05-14:20

Nonstop1h 15m

Southampton Eastleigh

Sun 5/10

12:00-13:20

Nonstop1h 20m

£105

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 16/10

13:05-14:20

Nonstop1h 15m

Southampton Eastleigh

Thu 23/10

15:05-16:25

Nonstop1h 20m

£114

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Wed 17/12

20:40-17:20

1 stop20h 40m

Southampton Eastleigh

Fri 19/12

17:45-07:25

1 stop13h 40m

£127

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 6/10

08:10-08:15

2 stops24h 05m

Southampton Eastleigh

Sat 18/10

15:20-16:40

Nonstop1h 20m

£129

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 29/9

10:05-11:20

Nonstop1h 15m

Southampton Eastleigh

Wed 1/10

09:00-21:40

1 stop12h 40m

£135

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 2/10

13:05-14:20

Nonstop1h 15m

Southampton Eastleigh

Sat 4/10

15:20-16:40

Nonstop1h 20m

£137

Flights are sorted by cheapest return flights first.

Deals found on 17/9

Showing 1-10 of 14 results
1
2

Best time to book a flight from Belfast Intl to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Belfast Intl 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 Belfast Intl Airport to Portsmouth

How far ahead should I book a flight from Belfast Intl Airport to Portsmouth?

Use this chart to determine the optimal time to book a return flight from Belfast Intl to Portsmouth. Price data was last updated on 12 September 2025.

The price you pay for your flight from Belfast Intl Airport to Portsmouth may vary depending on when you book. For the best chance of a lower fare, look to book 33 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Belfast Intl Airport to Portsmouth?

Currently, January is the cheapest month in which you can book a flight from Belfast Intl Airport to Portsmouth (average of £112). Flying from Belfast Intl Airport to Portsmouth in August is currently the most expensive (average of £164). 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 BFS to P0R?

Find hourly flight availability from Belfast Intl 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 18 September 2025.

When flying from Belfast Intl Airport 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.

What is the cheapest day to fly from Belfast Intl Airport to Portsmouth?

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

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

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 18 September 2025.
Check out reviews from past customers who have flown with Aer Lingus and easyJet from Belfast Intl Airport to Portsmouth to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,277 reviews
Check prices

Boarding

7.3

Crew

8.0

Overall

7.2

Food

6.5

Comfort

7.1

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

LHR - DUB

The lack of headphones impacted our ability to enjoy the entertainment system provided. The fact that my last connection was associated with an "affiliated airline" that did not allow me to retrieve a check in or a boarding pass via the app almost posed a significant issue as the last leg of the flight was overbooked and we were stressed about getting a seat as a result.
Aer Lingus
7.2
Good
1,277 reviews
Aer Lingus
7.2
Good
1,277 reviews
Check prices

Boarding

7.3

Crew

8.0

Overall

7.2

Food

6.5

Comfort

7.1

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

LHR - DUB

The lack of headphones impacted our ability to enjoy the entertainment system provided. The fact that my last connection was associated with an "affiliated airline" that did not allow me to retrieve a check in or a boarding pass via the app almost posed a significant issue as the last leg of the flight was overbooked and we were stressed about getting a seat as a result.
easyJet
6.9
Okay
1,822 reviews
Aer Lingus
7.2
Good
1,277 reviews
Check prices

Boarding

7.3

Crew

8.0

Overall

7.2

Food

6.5

Comfort

7.1

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

LHR - DUB

The lack of headphones impacted our ability to enjoy the entertainment system provided. The fact that my last connection was associated with an "affiliated airline" that did not allow me to retrieve a check in or a boarding pass via the app almost posed a significant issue as the last leg of the flight was overbooked and we were stressed about getting a seat as a result.

Related info for your journey

Find useful and relevant information for your journey from Belfast Intl to Portsmouth. 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 Belfast Intl Airport to Portsmouth?

    For as low as £48, easyJet can have you in Portsmouth from Belfast Intl Airport in 1h 15m. There are 326 mi between Belfast Intl Airport and Portsmouth. Generally, flights for this route are direct.

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

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

  • How can I find direct flights from Belfast Intl to Portsmouth?

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

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

    Yes. Cheapflights offers flight deals from Belfast Intl 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 Belfast Intl Airport to Portsmouth?

    Currently, January is the cheapest month in which you can book a flight from Belfast Intl Airport to Portsmouth (average of £112). Flying from Belfast Intl Airport to Portsmouth in August is currently the most expensive (average of £164). 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 Belfast Intl to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Belfast Intl to Portsmouth

Discover the top 5 airlines that operate flights from Belfast Intl 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 858,174 searches. Data last updated 18 September 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£26Average£52FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£30Average£81FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£50Average£63FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£66Average£118FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£74Average£143FlexibilityNo cancel feeOn-time70%
Search British Airways 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 Belfast Intl to Portsmouth?

Cheapflights helps you search for flights from Belfast Intl to Portsmouth via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Belfast Intl to Portsmouth?

Cheapflights simply makes it quick and affordable to book flights from Belfast Intl to Portsmouth 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 Belfast Intl to Portsmouth with no change fees?

Certainly. Search results for flights to Portsmouth from Belfast Intl shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

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

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