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Cheap flights from Belfast Intl Airport to Portsmouth from £20

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 20/4. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LHR
4 Feb — 11 Feb1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Belfast Intl to Portsmouth are usually found in March or April, booked 76 days in advance, depart on a Saturday or Wednesday and return on a Tuesday

Cheap flight deals from Belfast Intl to Portsmouth

Enter your travel dates to find the best prices.

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 5 January 2026.

Sat 18/422:25BFS - SOU
1 stop11h 00measyJet
Sat 25/412:15SOU - BFS
Nonstop1h 15measyJet
Deal found 4/1£109
Thu 19/313:35BFS - SOU
1 stop3h 45measyJet
Mon 23/317:45SOU - BFS
1 stop23h 15measyJet
Deal found 4/1£115
Wed 18/220:40BFS - SOU
1 stop20h 40measyJet
Wed 25/209:25SOU - BFS
1 stop3h 20measyJet
Deal found 3/1£118
Mon 16/208:15BFS - SOU
1 stop9h 00measyJet
Wed 25/209:25SOU - BFS
1 stop3h 20measyJet
Deal found 3/1£124
Thu 19/213:35BFS - SOU
1 stop3h 45measyJet
Wed 25/209:25SOU - BFS
1 stop3h 20measyJet
Deal found 3/1£140
Thu 19/213:35BFS - SOU
1 stop3h 45measyJet
Thu 26/217:55SOU - BFS
1 stop25h 40measyJet
Deal found 4/1£140
Tue 17/210:35BFS - SOU
1 stop6h 55mMultiple Airlines
Tue 24/209:20SOU - BFS
1 stop7h 40mMultiple Airlines
Deal found 3/1£149
Tue 17/210:35BFS - SOU
2 stops22h 15measyJet
Tue 24/209:20SOU - BFS
1 stop7h 40measyJet
Deal found 3/1£151
Tue 17/210:35BFS - SOU
1 stop6h 55mMultiple Airlines
Wed 25/209:25SOU - BFS
1 stop3h 20mMultiple Airlines
Deal found 3/1£160
Fri 20/210:35BFS - SOU
1 stop6h 35measyJet
Wed 25/209:25SOU - BFS
1 stop3h 20measyJet
Deal found 3/1£169
Fri 20/210:35BFS - SOU
1 stop6h 35measyJet
Thu 26/217:55SOU - BFS
1 stop25h 40measyJet
Deal found 3/1£169

Find 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 5 January 2026.

Round-trip from

£109

One-way from

£20

Popular in

June

Cheapest in

March

Average price

£121
easyJet
  • easyJet
  • 18/4-25/4
  • 1 total stop
  • 12h 15m total
  • Belfast to Portsmouth
Search Deals
easyJet
  • easyJet
  • 20/4
  • Nonstop
  • 1h 15m total
  • Belfast to Portsmouth
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£16 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 January 2026
Search Deals

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 5 January 2026.
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

Sat 18/4

22:25-09:25

1 stop11h 00m

Southampton Eastleigh

Sat 25/4

12:15-13:30

Nonstop1h 15m

£109

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 21/5

08:20-07:25

1 stop23h 05m

Southampton Eastleigh

Mon 25/5

12:25-13:40

Nonstop1h 15m

£109

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 19/3

13:35-17:20

1 stop3h 45m

Southampton Eastleigh

Mon 23/3

17:45-17:00

1 stop23h 15m

£115

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Wed 18/2

20:40-17:20

1 stop20h 40m

Southampton Eastleigh

Wed 25/2

09:25-12:45

1 stop3h 20m

£118

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 19/2

13:35-17:20

1 stop3h 45m

Southampton Eastleigh

Wed 25/2

09:25-12:45

1 stop3h 20m

£140

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 19/2

13:35-17:20

1 stop3h 45m

Southampton Eastleigh

Thu 26/2

17:55-19:35

1 stop25h 40m

£140

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Tue 17/2

10:35-08:50

2 stops22h 15m

Southampton Eastleigh

Tue 24/2

09:20-17:00

1 stop7h 40m

£151

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Tue 17/2

10:35-17:30

1 stop6h 55m

Southampton Eastleigh

Wed 25/2

09:25-12:45

1 stop3h 20m

£160

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Fri 20/2

10:35-17:10

1 stop6h 35m

Southampton Eastleigh

Wed 25/2

09:25-12:45

1 stop3h 20m

£169

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Fri 20/2

10:35-17:10

1 stop6h 35m

Southampton Eastleigh

Thu 26/2

17:55-19:35

1 stop25h 40m

£169

Flights are sorted by cheapest return flights first.

Deals found on 3/1

Showing 1-10 of 20 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 2 January 2026.

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 76 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, February is the cheapest month in which you can book a flight from Belfast Intl Airport to Portsmouth (average of £13). Flying from Belfast Intl Airport to Portsmouth in July is currently the most expensive (average of £47). 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 5 January 2026.

A simple way to save on the total cost of your ticket is to fly from Belfast Intl Airport to Portsmouth at midday. If you’re flexible enough to do this you can expect to save up to 22% on your trip compared to booking a flight in the evening.

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 3 January 2026.

Travellers seeking maximum savings on their Belfast Intl Airport to Portsmouth flight should consider departing on Tuesday at midday when fares are most often at their lowest. Friday at midday 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 5 January 2026.
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
1,425 reviews
Check prices

Food

6.6

Entertainment

6.9

Comfort

7.1

Boarding

7.4

Crew

8.0

Overall

7.2

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

MAN - DUB

They did not list a gate until it was time to board.
Aer Lingus
7.2
Good
1,425 reviews
Aer Lingus
7.2
Good
1,425 reviews
Check prices

Food

6.6

Entertainment

6.9

Comfort

7.1

Boarding

7.4

Crew

8.0

Overall

7.2

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

MAN - DUB

They did not list a gate until it was time to board.
easyJet
6.9
Okay
1,857 reviews
Aer Lingus
7.2
Good
1,425 reviews
Check prices

Food

6.6

Entertainment

6.9

Comfort

7.1

Boarding

7.4

Crew

8.0

Overall

7.2

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

MAN - DUB

They did not list a gate until it was time to board.

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 £109, easyJet can have you in Portsmouth from Belfast Intl Airport in 11h. There are 326 mi between Belfast Intl Airport and Portsmouth.

  • 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, February is the cheapest month in which you can book a flight from Belfast Intl Airport to Portsmouth (average of £13). Flying from Belfast Intl Airport to Portsmouth in July is currently the most expensive (average of £47). 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 5 January 2026.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£26Average£56FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£28Average£88FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£48Average£63FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£76Average£131FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£79Average£148FlexibilityNo 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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