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Cheap flights from Belfast Intl Airport to Portsmouth from £74

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 7/11. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LHR
28 Nov — 5 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Belfast Intl to Portsmouth are usually found in March or January, booked 33 days in advance, depart on a Saturday or Wednesday 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 29 October 2025.

Round-trip from

£163

One-way from

£74

Popular in

June

Cheapest in

March

Average price

£114
easyJet
  • easyJet
  • 12/12-14/12
  • 2 total stops
  • 18h 50m total
  • Belfast to Portsmouth
Search Deals
easyJet
  • easyJet
  • 7/11
  • 1 total stop
  • 21h 20m total
  • Belfast to Portsmouth
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (£28 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find 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 29 October 2025.

Fri 12/1211:45BFS - SOU
1 stop5h 25measyJet
Sun 14/1218:20SOU - BFS
1 stop13h 25measyJet
Deal found 28/10£163
Tue 30/1208:35BFS - SOU
1 stop24h 15measyJet
Mon 5/112:05SOU - BFS
1 stop8h 15measyJet
Deal found 28/10£165
Mon 24/1120:50BFS - SOU
1 stop12h 00mMultiple Airlines
Mon 1/1208:30SOU - BFS
2 stops23h 50mMultiple Airlines
Deal found 27/10£189
Mon 17/1120:50BFS - SOU
1 stop12h 00mMultiple Airlines
Fri 21/1108:10SOU - BFS
2 stops27h 45mMultiple Airlines
Deal found 27/10£192
Fri 12/1211:45BFS - SOU
1 stop5h 25measyJet
Fri 19/1217:45SOU - BFS
1 stop13h 40measyJet
Deal found 28/10£195
Mon 24/1108:15BFS - SOU
1 stop3h 10measyJet
Mon 1/1212:05SOU - BFS
1 stop3h 30measyJet
Deal found 27/10£204
Sat 8/1112:45BFS - SOU
2 stops20h 00mMultiple Airlines
Sat 22/1109:30SOU - BFS
1 stop12h 30mMultiple Airlines
Deal found 28/10£207
Sat 15/1107:20BFS - SOU
2 stops25h 25mMultiple Airlines
Sat 22/1109:30SOU - BFS
1 stop5h 40mMultiple Airlines
Deal found 27/10£208

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 29 October 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

Fri 12/12

11:45-17:10

1 stop5h 25m

Southampton Eastleigh

Sun 14/12

18:20-07:45

1 stop13h 25m

£163

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Tue 30/12

08:35-08:50

1 stop24h 15m

Southampton Eastleigh

Mon 5/1

12:05-20:20

1 stop8h 15m

£165

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 9/2

08:15-17:15

1 stop9h 00m

Southampton Eastleigh

Thu 12/2

17:55-11:15

1 stop17h 20m

£174

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Fri 12/12

11:45-17:10

1 stop5h 25m

Southampton Eastleigh

Fri 19/12

17:45-07:25

1 stop13h 40m

£189

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 24/11

22:20-19:40

2 stops21h 20m

Southampton Eastleigh

Mon 1/12

08:30-08:20

2 stops23h 50m

£191

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 17/11

20:50-08:50

1 stop12h 00m

Southampton Eastleigh

Fri 21/11

08:10-11:55

2 stops27h 45m

£192

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 23/3

20:50-08:50

1 stop12h 00m

Southampton Eastleigh

Fri 27/3

19:50-14:40

2 stops18h 50m

£194

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 24/11

08:15-11:25

1 stop3h 10m

Southampton Eastleigh

Mon 1/12

12:05-15:35

1 stop3h 30m

£204

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 8/11

12:45-08:45

2 stops20h 00m

Southampton Eastleigh

Sat 22/11

09:30-22:00

1 stop12h 30m

£207

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 15/11

07:20-08:45

2 stops25h 25m

Southampton Eastleigh

Sat 22/11

09:30-15:10

1 stop5h 40m

£208

Flights are sorted by cheapest return flights first.

Deals found on 27/10

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 24 October 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, March is the cheapest month in which you can book a flight from Belfast Intl Airport to Portsmouth (average of £14). 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 29 October 2025.

A simple way to save on the total cost of your ticket is to fly from Belfast Intl Airport to Portsmouth in the evening. If you’re flexible enough to do this you can expect to save up to 7% on your trip compared to booking a flight in the afternoon.

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 Tuesday at midday when fares are most often at their lowest. Wednesday 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 29 October 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
1,361 reviews
Check prices

Crew

8.0

Entertainment

6.9

Overall

7.2

Boarding

7.4

Comfort

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

David,Oct 2025

LIS - DUB

Two issues... 1. The Aer Lingus check-in counter in Lisbon did not open until 90 minutes prior to the flight. Huge line of customers waiting to check-in and very time consuming. Plus, having to clear security, passport control, and take the shuttle bus to the plane takes a long time. Consequently, the flight was delayed due to passengers not being able to get to the gate on time. I showed up four hours early but had to wait for over two hours just for the check-in counter to open. Many passengers complaining about the same issue. VERY STRESSFUL! 2. During the flight one of the flight attendants (Glen) was quite rude to a parent of a non-verbal autistic child. At one point I heard him say in a nasty tone, "You have three seconds to put your bag under the seat or I will take it and check it. 3, 2, 1!" I did not speak to the flight attendant because I was afraid he would kick me off the flight. Very unpleasant to everyone before take off also while instructing them to put the seats up and bags under. A little interpersonal communication training could help this man. Other than those two issues, the flight was fine.
Aer Lingus
7.2
Good
1,361 reviews
Aer Lingus
7.2
Good
1,361 reviews
Check prices

Crew

8.0

Entertainment

6.9

Overall

7.2

Boarding

7.4

Comfort

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

David,Oct 2025

LIS - DUB

Two issues... 1. The Aer Lingus check-in counter in Lisbon did not open until 90 minutes prior to the flight. Huge line of customers waiting to check-in and very time consuming. Plus, having to clear security, passport control, and take the shuttle bus to the plane takes a long time. Consequently, the flight was delayed due to passengers not being able to get to the gate on time. I showed up four hours early but had to wait for over two hours just for the check-in counter to open. Many passengers complaining about the same issue. VERY STRESSFUL! 2. During the flight one of the flight attendants (Glen) was quite rude to a parent of a non-verbal autistic child. At one point I heard him say in a nasty tone, "You have three seconds to put your bag under the seat or I will take it and check it. 3, 2, 1!" I did not speak to the flight attendant because I was afraid he would kick me off the flight. Very unpleasant to everyone before take off also while instructing them to put the seats up and bags under. A little interpersonal communication training could help this man. Other than those two issues, the flight was fine.
easyJet
6.9
Okay
1,840 reviews
Aer Lingus
7.2
Good
1,361 reviews
Check prices

Crew

8.0

Entertainment

6.9

Overall

7.2

Boarding

7.4

Comfort

7.1

Food

6.6

Reviews

1 / 20
6.0
Good

David,Oct 2025

LIS - DUB

Two issues... 1. The Aer Lingus check-in counter in Lisbon did not open until 90 minutes prior to the flight. Huge line of customers waiting to check-in and very time consuming. Plus, having to clear security, passport control, and take the shuttle bus to the plane takes a long time. Consequently, the flight was delayed due to passengers not being able to get to the gate on time. I showed up four hours early but had to wait for over two hours just for the check-in counter to open. Many passengers complaining about the same issue. VERY STRESSFUL! 2. During the flight one of the flight attendants (Glen) was quite rude to a parent of a non-verbal autistic child. At one point I heard him say in a nasty tone, "You have three seconds to put your bag under the seat or I will take it and check it. 3, 2, 1!" I did not speak to the flight attendant because I was afraid he would kick me off the flight. Very unpleasant to everyone before take off also while instructing them to put the seats up and bags under. A little interpersonal communication training could help this man. Other than those two issues, the flight was fine.

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 £163, easyJet can have you in Portsmouth from Belfast Intl Airport in 5h 25m. 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, March is the cheapest month in which you can book a flight from Belfast Intl Airport to Portsmouth (average of £14). 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 29 October 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£21Average£54FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£30Average£88FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£48Average£64FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£71Average£126FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£77Average£148FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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How does Cheapflights help users find flights from Belfast Intl to Portsmouth?

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

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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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