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Cheap flights from Portsmouth to Northern Ireland from £35

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 31/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BFS
16 Jul — 23 Jul1
1 adult

Cheap flight deals from Portsmouth to Northern Ireland

Keep the following information in mind while searching for Portsmouth to Northern Ireland flight deals. Data was last updated 11 July 2025.

Round-trip from

£70

One-way from

£35

Popular in

July

Cheapest in

January

Average price

£91
easyJet
  • easyJet
  • 13/10-16/10
  • Nonstop
  • 2h 35m total
  • Portsmouth to Northern Ireland
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easyJet
  • easyJet
  • 31/8
  • 1 total stop
  • 25h 35m total
  • Portsmouth to Northern Ireland
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£14 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£2 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
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Find flight deals from Portsmouth to Northern Ireland

Cheapest flights from Portsmouth to Northern Ireland
Explore the most affordable flight options available from Portsmouth to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 July 2025.

Mon 13/1011:50SOU - BFS
Nonstop1h 20measyJet
Thu 16/1013:05BFS - SOU
Nonstop1h 15measyJet
Deal found 10/7£70
Thu 18/916:35SOU - BHD
Nonstop1h 35mAer Lingus
Mon 22/911:00BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 10/7£78
Thu 28/820:00SOU - BFS
2 stops24h 30mMultiple Airlines
Sat 30/806:20BFS - SOU
Nonstop1h 15mMultiple Airlines
Deal found 9/7£158
Thu 18/916:35SOU - BHD
Nonstop1h 35mMultiple Airlines
Sun 21/907:05BHD - SOU
2 stops24h 30mMultiple Airlines
Deal found 10/7£161
Sun 10/821:30SOU - BHD
1 stop9h 55measyJet
Fri 15/812:40BHD - SOU
1 stop19h 15measyJet
Deal found 9/7£192

Cheapflights Fare Finder

Customise your flight search to find flights from Portsmouth to Northern Ireland 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 11 July 2025.
Use the filters below to find and compare flights from Portsmouth to Northern Ireland that are best for you.

Fly from

Portsmouth

Fly to

Northern Ireland

Route

Depart

Return

Price

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Mon 13/10

11:50-13:10

Nonstop1h 20m

Belfast Intl

Thu 16/10

13:05-14:20

Nonstop1h 15m

£70

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 18/9

16:35-18:10

Nonstop1h 35m

Belfast City

Mon 22/9

11:00-12:40

Nonstop1h 40m

£78

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 28/8

20:00-20:30

2 stops24h 30m

Belfast Intl

Sat 30/8

06:20-07:35

Nonstop1h 15m

£158

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 18/9

16:35-18:10

Nonstop1h 35m

Belfast City

Sun 21/9

07:05-07:35

2 stops24h 30m

£161

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sun 10/8

21:30-07:25

1 stop9h 55m

Belfast City

Fri 15/8

12:40-07:55

1 stop19h 15m

£192

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Sun 31/8

21:30-23:05

1 stop25h 35m

£35

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sun 31/8

08:55-10:30

Nonstop1h 35m

£35

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sun 31/8

21:30-07:25

1 stop9h 55m

£48

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 31/7

08:55-10:30

Nonstop1h 35m

£107

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sun 31/8

21:30-12:50

2 stops15h 20m

£111

Flights are sorted by cheapest return flights first.

Deals found on 10/7

Showing 1-10 of 12 results
1
2

Best time to book a flight from Portsmouth to Northern Ireland

Have a flexible travel schedule? Discover the best time to fly to Northern Ireland from Portsmouth 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 Portsmouth to Northern Ireland

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

Currently, January is the cheapest month in which you can book a flight from Portsmouth to Northern Ireland (average of £67). Flying from Portsmouth to Northern Ireland in July is currently the most expensive (average of £90). 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 P0R to NIR?

Find hourly flight availability from Portsmouth to Northern Ireland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 July 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portsmouth to Northern Ireland as you normally would.

How much does it cost for a return flight from Portsmouth to Northern Ireland?

Reviews of airlines servicing Northern Ireland

Get insights into the airlines that provide service to Northern Ireland. 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 Northern Ireland. Reviews last updated 11 July 2025.
Check out reviews from past customers who have flown with Aer Lingus, easyJet, andBritish Airways from Portsmouth to Northern Ireland to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.1
Good
1,154 reviews
Check prices

Comfort

7.0

Food

6.4

Crew

8.0

Boarding

7.3

Overall

7.1

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Tim Hunter,May 2025

LHR - DUB

In the economy section one of the bathrooms was reserved for first class which made for very long lines in for the bathrooms. The temperature for the flight was very cold. I ended up catching a mild cold on the way home. No blankets were handed out / offered. The food service was OK but no napkins were given with the meals -- very weird. The crew as OK but definitely not nice and welcoming.
Aer Lingus
7.1
Good
1,154 reviews
Aer Lingus
7.1
Good
1,154 reviews
Check prices

Comfort

7.0

Food

6.4

Crew

8.0

Boarding

7.3

Overall

7.1

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Tim Hunter,May 2025

LHR - DUB

In the economy section one of the bathrooms was reserved for first class which made for very long lines in for the bathrooms. The temperature for the flight was very cold. I ended up catching a mild cold on the way home. No blankets were handed out / offered. The food service was OK but no napkins were given with the meals -- very weird. The crew as OK but definitely not nice and welcoming.
easyJet
6.9
Okay
1,817 reviews
Aer Lingus
7.1
Good
1,154 reviews
Check prices

Comfort

7.0

Food

6.4

Crew

8.0

Boarding

7.3

Overall

7.1

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Tim Hunter,May 2025

LHR - DUB

In the economy section one of the bathrooms was reserved for first class which made for very long lines in for the bathrooms. The temperature for the flight was very cold. I ended up catching a mild cold on the way home. No blankets were handed out / offered. The food service was OK but no napkins were given with the meals -- very weird. The crew as OK but definitely not nice and welcoming.
British Airways
6.6
Okay
7,109 reviews
Aer Lingus
7.1
Good
1,154 reviews
Check prices

Comfort

7.0

Food

6.4

Crew

8.0

Boarding

7.3

Overall

7.1

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Tim Hunter,May 2025

LHR - DUB

In the economy section one of the bathrooms was reserved for first class which made for very long lines in for the bathrooms. The temperature for the flight was very cold. I ended up catching a mild cold on the way home. No blankets were handed out / offered. The food service was OK but no napkins were given with the meals -- very weird. The crew as OK but definitely not nice and welcoming.

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Northern Ireland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Portsmouth to Northern Ireland one-way?

    The cheapest airline one-way is easyJet, with whom users have recently found tickets for as low as £35. However, be on the lookout for offers from Aer Lingus and British Airways, as they are both options that can get you from Portsmouth to Northern Ireland for a low price.

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

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

  • How can I find direct flights from Portsmouth to Northern Ireland?

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

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

    Yes. Cheapflights offers flight deals from Portsmouth to Northern Ireland 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 Portsmouth to Northern Ireland?

    Currently, January is the cheapest month in which you can book a flight from Portsmouth to Northern Ireland (average of £67). Flying from Portsmouth to Northern Ireland in July is currently the most expensive (average of £90). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Portsmouth to Northern Ireland

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Portsmouth to Northern Ireland

Discover the top 6 airlines that operate flights from Portsmouth to Northern Ireland. 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 11 July 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£29Average£55FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£29Average£76FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£31Average£71FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£53Average£100FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£77Average£151FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£127Average£177FlexibilityNo cancel feeOn-time79%
Search Loganair flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Portsmouth to Northern Ireland?

When you search for this flight from Portsmouth to Northern Ireland, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Northern Ireland?

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Portsmouth to Northern Ireland, users can toggle the no change fees filter when performing a flight search.

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Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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