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Cheap flights from Portsmouth to Northern Ireland from £37

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BFS
1 Sep — 8 Sep1
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 27 August 2025.

Round-trip from

£54

One-way from

£37

Popular in

July

Cheapest in

January

Average price

£95
easyJet
  • easyJet
  • 9/10-11/10
  • Nonstop
  • 2h 35m total
  • Portsmouth to Northern Ireland
Search Deals
Aer Lingus
  • Aer Lingus
  • 9/9
  • Nonstop
  • 1h 35m total
  • Portsmouth to Northern Ireland
Search Deals
Highest demand for flights based on searches. 30% potential increase in price (£21 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

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 27 August 2025.

Thu 9/1015:05SOU - BFS
Nonstop1h 20measyJet
Sat 11/1013:35BFS - SOU
Nonstop1h 15measyJet
Deal found 26/8£54
Sun 7/908:50SOU - BFS
Nonstop1h 20measyJet
Mon 8/910:05BFS - SOU
Nonstop1h 15measyJet
Deal found 26/8£62
Thu 25/915:05SOU - BFS
Nonstop1h 20measyJet
Thu 2/1013:05BFS - SOU
Nonstop1h 15measyJet
Deal found 26/8£63
Thu 9/1015:05SOU - BFS
Nonstop1h 20measyJet
Mon 13/1010:05BFS - SOU
Nonstop1h 15measyJet
Deal found 26/8£79
Fri 3/1012:15SOU - BFS
Nonstop1h 20measyJet
Sun 5/1010:10BFS - SOU
Nonstop1h 15measyJet
Deal found 25/8£82
Wed 5/1108:55SOU - BHD
Nonstop1h 40mAer Lingus
Thu 6/1116:55BHD - SOU
Nonstop1h 35mAer Lingus
Deal found 26/8£87
Mon 22/913:10SOU - BHD
Nonstop1h 35mAer Lingus
Wed 24/906:40BHD - SOU
Nonstop1h 45mAer Lingus
Deal found 25/8£91
Fri 12/912:15SOU - BFS
Nonstop1h 20measyJet
Mon 15/910:05BFS - SOU
Nonstop1h 15measyJet
Deal found 27/8£91
Mon 8/915:45SOU - BHD
Nonstop1h 35mAer Lingus
Tue 9/906:40BHD - SOU
Nonstop1h 45mAer Lingus
Deal found 26/8£91
Fri 3/1012:15SOU - BFS
Nonstop1h 20measyJet
Thu 9/1013:05BFS - SOU
Nonstop1h 15measyJet
Deal found 25/8£94
Sun 7/908:55SOU - BHD
Nonstop1h 35mAer Lingus
Mon 8/911:00BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 26/8£96
Fri 3/1012:15SOU - BFS
Nonstop1h 20measyJet
Fri 10/1010:30BFS - SOU
Nonstop1h 15measyJet
Deal found 25/8£101

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 27 August 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

Thu 9/10

15:05-16:25

Nonstop1h 20m

Belfast Intl

Sat 11/10

13:35-14:50

Nonstop1h 15m

£54

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Sun 7/9

08:50-10:10

Nonstop1h 20m

Belfast Intl

Mon 8/9

10:05-11:20

Nonstop1h 15m

£62

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 25/9

15:05-16:25

Nonstop1h 20m

Belfast Intl

Thu 2/10

13:05-14:20

Nonstop1h 15m

£63

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 9/10

15:05-16:25

Nonstop1h 20m

Belfast Intl

Mon 13/10

10:05-11:20

Nonstop1h 15m

£79

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 3/10

12:15-13:35

Nonstop1h 20m

Belfast Intl

Sun 5/10

10:10-11:25

Nonstop1h 15m

£82

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Wed 5/11

08:55-10:35

Nonstop1h 40m

Belfast City

Thu 6/11

16:55-18:30

Nonstop1h 35m

£87

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 25/9

08:55-10:30

Nonstop1h 35m

Belfast City

Thu 2/10

06:40-08:25

Nonstop1h 45m

£91

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Mon 22/9

13:10-14:45

Nonstop1h 35m

Belfast City

Wed 24/9

06:40-08:25

Nonstop1h 45m

£91

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sat 15/11

15:45-17:20

Nonstop1h 35m

Belfast City

Mon 17/11

06:40-08:25

Nonstop1h 45m

£91

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 25/9

08:55-10:30

Nonstop1h 35m

Belfast City

Thu 25/9

13:40-15:15

Nonstop1h 35m

£91

Flights are sorted by cheapest return flights first.

Deals found on 26/8

Showing 1-10 of 40 results
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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 27 August 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.

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 27 August 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
1,238 reviews
Check prices

Comfort

7.1

Crew

8.0

Overall

7.2

Entertainment

6.9

Boarding

7.3

Food

6.5

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
1,238 reviews
Aer Lingus
7.2
Good
1,238 reviews
Check prices

Comfort

7.1

Crew

8.0

Overall

7.2

Entertainment

6.9

Boarding

7.3

Food

6.5

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
1,817 reviews
Aer Lingus
7.2
Good
1,238 reviews
Check prices

Comfort

7.1

Crew

8.0

Overall

7.2

Entertainment

6.9

Boarding

7.3

Food

6.5

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 £54, easyJet can have you in Northern Ireland from Portsmouth in 1h 20m. The distance between Portsmouth and Northern Ireland is about 326 mi. Generally, flights for this route are direct.

  • 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

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Alternative routes for Portsmouth to Northern Ireland

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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 27 August 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£29Average£58FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£29Average£76FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£43Average£74FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£61Average£105FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£78Average£149FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£129Average£180FlexibilityNo 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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