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Cheap flights from Portsmouth to Northern Ireland from £55

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 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BFS
5 Dec — 12 Dec1
1 adult
1 adult, Economy, 0 bags

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 5 November 2025.

Round-trip from

£91

One-way from

£55

Popular in

July

Cheapest in

January

Average price

£49
Aer Lingus
  • Aer Lingus
  • 18/11-22/11
  • Nonstop
  • 3h 20m total
  • Portsmouth to Northern Ireland
Search Deals
easyJet
  • easyJet
  • 10/12
  • 1 total stop
  • 3h 20m total
  • Portsmouth to Northern Ireland
Search Deals
Highest demand for flights based on searches. 28% potential increase in price (£20 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Find flight deals from Portsmouth to Northern Ireland

Enter your travel dates to find the best prices.

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 5 November 2025.

Wed 12/1108:55SOU - BHD
Nonstop1h 40mAer Lingus
Sat 15/1106:40BHD - SOU
Nonstop1h 45mAer Lingus
Deal found 4/11£91
Tue 9/1209:20SOU - BFS
1 stop7h 40measyJet
Tue 16/1212:30BFS - SOU
1 stop20h 20measyJet
Deal found 3/11£99
Tue 9/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Thu 18/1210:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 4/11£99
Wed 3/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Thu 4/1216:55BHD - SOU
Nonstop1h 35mAer Lingus
Deal found 3/11£104
Tue 2/1208:55SOU - BHD
Nonstop1h 40mAer Lingus
Fri 5/1216:55BHD - SOU
Nonstop1h 35mAer Lingus
Deal found 4/11£107
Thu 4/1212:20SOU - BHD
Nonstop1h 35mAer Lingus
Mon 8/1210:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 4/11£112
Thu 4/1212:20SOU - BHD
Nonstop1h 35mMultiple Airlines
Mon 8/1217:45BHD - SOU
1 stop15h 05mMultiple Airlines
Deal found 4/11£121
Fri 5/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Mon 8/1210:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 4/11£138
Tue 9/1209:20SOU - BFS
1 stop7h 40measyJet
Thu 18/1213:35BFS - SOU
1 stop3h 45measyJet
Deal found 4/11£142
Fri 5/1219:00SOU - BHD
Nonstop1h 35mMultiple Airlines
Mon 8/1217:45BHD - SOU
1 stop15h 05mMultiple Airlines
Deal found 4/11£150
Fri 12/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Sun 14/1210:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 4/11£151
Tue 9/1219:00SOU - BHD
Nonstop1h 35mMultiple Airlines
Thu 18/1211:00BHD - SOU
2 stops8h 40mMultiple Airlines
Deal found 4/11£157

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 5 November 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

Tue 9/12

09:20-17:00

1 stop7h 40m

Belfast Intl

Tue 16/12

12:30-08:50

1 stop20h 20m

£99

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 30/1

17:45-07:25

1 stop13h 40m

Belfast Intl

Sun 1/2

11:30-17:45

1 stop6h 15m

£125

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Tue 9/12

09:20-17:00

1 stop7h 40m

Belfast Intl

Thu 18/12

13:35-17:20

1 stop3h 45m

£142

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Fri 12/12

19:00-20:35

Nonstop1h 35m

Belfast City

Sun 14/12

10:10-11:50

Nonstop1h 40m

£151

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 5/12

08:10-23:25

2 stops15h 15m

Belfast Intl

Mon 8/12

20:50-08:50

1 stop12h 00m

£160

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 30/1

08:10-08:25

2 stops24h 15m

Belfast Intl

Sun 1/2

11:30-17:45

1 stop6h 15m

£161

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 5/12

17:45-07:25

1 stop13h 40m

Belfast Intl

Mon 8/12

08:15-11:25

1 stop3h 10m

£166

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Fri 28/11

19:00-20:35

Nonstop1h 35m

Belfast City

Sun 30/11

10:10-11:50

Nonstop1h 40m

£176

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Wed 10/12

09:25-19:05

2 stops9h 40m

Belfast Intl

Thu 11/12

19:45-13:45

2 stops18h 00m

£181

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Fri 28/11

19:00-20:35

Nonstop1h 35m

Belfast City

Sun 30/11

08:40-08:45

2 stops24h 05m

£189

Flights are sorted by cheapest return flights first.

Deals found on 3/11

Showing 1-10 of 27 results
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2
3

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 £15). Flying from Portsmouth to Northern Ireland in August is currently the most expensive (average of £41). 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 5 November 2025.

One of the essential ways to save on airfare from Portsmouth to Northern Ireland is to remain as flexible as possible. Flights that are at midday tend to be the most expensive. A flight in the evening could potentially save you up to 31% on airfare.

What is the cheapest day to fly from Portsmouth to Northern Ireland?

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

Travellers seeking maximum savings on their Portsmouth to Northern Ireland flight should consider departing on Sunday afternoons when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 5 November 2025.
Check out reviews from past customers who have flown with Aer Lingus and easyJet 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
7.2
Good
1,365 reviews
Check prices

Crew

8.0

Comfort

7.1

Boarding

7.4

Entertainment

6.9

Food

6.6

Overall

7.2

Reviews

1 / 20
4.0
Okay

Anonymous,Jul 2025

DUB - ORD

The inability to check in with the final leg of our flight via the Aers Lingus app led to a stressful trip as the final leg was overbooked and we were not able to confirm a seat until we had arrived to Chicago. Lack of earphones for the "entertainment" system were not voluntarily provided or even referenced as available (even for a charge) while boarding the plane - this seems like an oversight.
Aer Lingus
7.2
Good
1,365 reviews
Aer Lingus
7.2
Good
1,365 reviews
Check prices

Crew

8.0

Comfort

7.1

Boarding

7.4

Entertainment

6.9

Food

6.6

Overall

7.2

Reviews

1 / 20
4.0
Okay

Anonymous,Jul 2025

DUB - ORD

The inability to check in with the final leg of our flight via the Aers Lingus app led to a stressful trip as the final leg was overbooked and we were not able to confirm a seat until we had arrived to Chicago. Lack of earphones for the "entertainment" system were not voluntarily provided or even referenced as available (even for a charge) while boarding the plane - this seems like an oversight.
easyJet
6.9
Okay
1,841 reviews
Aer Lingus
7.2
Good
1,365 reviews
Check prices

Crew

8.0

Comfort

7.1

Boarding

7.4

Entertainment

6.9

Food

6.6

Overall

7.2

Reviews

1 / 20
4.0
Okay

Anonymous,Jul 2025

DUB - ORD

The inability to check in with the final leg of our flight via the Aers Lingus app led to a stressful trip as the final leg was overbooked and we were not able to confirm a seat until we had arrived to Chicago. Lack of earphones for the "entertainment" system were not voluntarily provided or even referenced as available (even for a charge) while boarding the plane - this seems like an oversight.

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.

  • How long is the flight from Portsmouth to Northern Ireland?

    For as low as £151, easyJet can have you in Northern Ireland from Portsmouth in 1h 35m. The distance between Portsmouth and Northern Ireland is about 316 mi. Both multi-stop and direct flights can be found to your destination and back.

  • 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 £15). Flying from Portsmouth to Northern Ireland in August is currently the most expensive (average of £41). 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 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 5 November 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£29Average£61FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£30Average£83FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£41Average£75FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£65Average£111FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£79Average£145FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£134Average£185FlexibilityNo cancel feeOn-time79%
Search Loganair 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 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.

Can Cheapflights notify me if prices for flights from Portsmouth to Northern Ireland become cheaper?

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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