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Cheap flights from Northern Ireland to Portsmouth from £29

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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LHR
2 Sep — 9 Sep1
1 adult

Cheap flight deals from Northern Ireland to Portsmouth

Keep the following information in mind while searching for Northern Ireland to Portsmouth flight deals. Data was last updated 28 August 2025.

Round-trip from

£53

One-way from

£29

Popular in

August

Cheapest in

January

Average price

£100
easyJet
  • easyJet
  • 4/10-13/10
  • Nonstop
  • 2h 35m total
  • Northern Ireland to Portsmouth
Search Deals
easyJet
  • easyJet
  • 11/10
  • Nonstop
  • 1h 15m total
  • Northern Ireland to Portsmouth
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£12 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
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Find flight deals from Northern Ireland to Portsmouth

Cheapest flights from Northern Ireland to Portsmouth
Explore the most affordable flight options available from Northern Ireland to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 August 2025.

Sat 4/1013:35BFS - SOU
Nonstop1h 15measyJet
Mon 13/1011:50SOU - BFS
Nonstop1h 20measyJet
Deal found 26/8£53
Sat 4/1013:35BFS - SOU
Nonstop1h 15measyJet
Mon 6/1011:50SOU - BFS
Nonstop1h 20measyJet
Deal found 27/8£65
Sat 27/913:35BFS - SOU
Nonstop1h 15measyJet
Sat 4/1008:25SOU - BFS
1 stop23h 45measyJet
Deal found 27/8£86
Wed 15/1006:40BHD - SOU
Nonstop1h 45mAer Lingus
Mon 20/1008:55SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 27/8£88
Mon 6/1011:00BHD - SOU
Nonstop1h 40mAer Lingus
Sun 12/1008:55SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 25/8£89
Thu 28/806:40BHD - SOU
Nonstop1h 45mAer Lingus
Sat 30/808:55SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 26/8£90
Thu 28/806:40BHD - SOU
Nonstop1h 45mAer Lingus
Fri 29/815:45SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 26/8£96
Sat 1/1106:40BHD - SOU
Nonstop1h 45mAer Lingus
Sat 8/1108:55SOU - BHD
Nonstop1h 40mAer Lingus
Deal found 25/8£101
Fri 28/1114:40BHD - SOU
Nonstop1h 35mAer Lingus
Fri 5/1213:05SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 27/8£102
Sun 26/1006:40BHD - SOU
Nonstop1h 45mAer Lingus
Thu 30/1019:00SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 25/8£107
Mon 22/913:40BHD - SOU
Nonstop1h 35mAer Lingus
Mon 29/908:55SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 25/8£117
Sun 21/911:00BHD - SOU
Nonstop1h 40mAer Lingus
Mon 29/908:55SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 25/8£119

Cheapflights Fare Finder

 
Customise your flight search to find flights from Northern Ireland 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 28 August 2025.
Use the filters below to find and compare flights from Northern Ireland to Portsmouth that are best for you.

Fly from

Northern Ireland

Fly to

Portsmouth

Route

Depart

Return

Price

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 4/10

13:35-14:50

Nonstop1h 15m

Southampton Eastleigh

Mon 13/10

11:50-13:10

Nonstop1h 20m

£53

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 4/10

13:35-14:50

Nonstop1h 15m

Southampton Eastleigh

Mon 6/10

11:50-13:10

Nonstop1h 20m

£65

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 27/9

13:35-14:50

Nonstop1h 15m

Southampton Eastleigh

Sat 4/10

08:25-08:10

1 stop23h 45m

£86

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Wed 15/10

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Mon 20/10

08:55-10:30

Nonstop1h 35m

£88

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Tue 21/10

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Tue 21/10

15:45-17:20

Nonstop1h 35m

£89

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Mon 6/10

11:00-12:40

Nonstop1h 40m

Southampton Eastleigh

Sun 12/10

08:55-10:30

Nonstop1h 35m

£89

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Sat 6/9

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Tue 9/9

08:55-10:30

Nonstop1h 35m

£91

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Mon 3/11

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Wed 5/11

08:55-10:35

Nonstop1h 40m

£91

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Sat 1/11

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Sat 8/11

08:55-10:35

Nonstop1h 40m

£101

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Fri 28/11

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Fri 5/12

16:45-18:20

Nonstop1h 35m

£102

Flights are sorted by cheapest return flights first.

Deals found on 27/8

Showing 1-10 of 38 results
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Best time to book a flight from Northern Ireland to Portsmouth

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

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

Currently, January is the cheapest month in which you can book a flight from Northern Ireland to Portsmouth (average of £112). Flying from Northern Ireland to Portsmouth in August is currently the most expensive (average of £164). 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 NIR to P0R?

Find hourly flight availability from Northern Ireland 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 28 August 2025.

When flying from Northern Ireland to Portsmouth, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Related info for your journey

Find useful and relevant information for your journey from Northern Ireland 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 Northern Ireland to Portsmouth?

    A quick flight from Northern Ireland to Portsmouth can take about 1h 15m. easyJet provides one of the quickest options available for as low as £53. Northern Ireland and Portsmouth are separated by a distance of 326 mi. All flights are typically direct.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Northern Ireland to Portsmouth (average of £112). Flying from Northern Ireland to Portsmouth in August is currently the most expensive (average of £164). 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 Northern Ireland to Portsmouth

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

Discover the top 6 airlines that operate flights from Northern Ireland 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 28 August 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£29Average£53FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£29Average£85FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£48Average£78FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£65Average£153FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£75Average£152FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£130Average£219FlexibilityNo 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 Northern Ireland to Portsmouth?

Deals for Northern Ireland to Portsmouth flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights helps you find that perfect flight to Portsmouth from Northern Ireland by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Northern Ireland to Portsmouth with no change fees?

Yes! Cheapflights helps users easily find flights from Northern Ireland to Portsmouth with no change fees.

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

Not ready to book yet? You can track prices for flights from Northern Ireland to Portsmouth on Cheapflights with our Price Alert feature and get notified when better prices are available.

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