Find flights
Deals
When to book
FAQs

Cheap flights from Northern Ireland to Portsmouth from £27

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 26/4. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LHR
11 Dec — 18 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Northern Ireland to Portsmouth

Enter your travel dates to find the best prices.

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 11 November 2025.

Sat 22/1106:40BHD - SOU
Nonstop1h 45mAer Lingus
Sat 29/1115:45SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 10/11£91
Sat 15/1106:40BHD - SOU
Nonstop1h 45mAer Lingus
Mon 17/1119:00SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 10/11£106
Thu 11/1210:10BHD - SOU
Nonstop1h 40mAer Lingus
Mon 15/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 10/11£111
Thu 11/1210:10BHD - SOU
Nonstop1h 40mMultiple Airlines
Mon 15/1208:30SOU - BHD
2 stops24h 00mMultiple Airlines
Deal found 10/11£146
Sat 22/1107:15BHD - SOU
1 stop5h 55mMultiple Airlines
Sat 29/1115:45SOU - BHD
Nonstop1h 35mMultiple Airlines
Deal found 10/11£153
Tue 16/1206:40BHD - SOU
Nonstop1h 45mAer Lingus
Sun 28/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 9/11£156
Thu 11/1219:45BFS - SOU
2 stops23h 35mMultiple Airlines
Mon 15/1208:30SOU - BFS
2 stops23h 10mMultiple Airlines
Deal found 10/11£157
Thu 11/1220:00BHD - SOU
2 stops23h 20measyJet
Mon 15/1208:30SOU - BHD
2 stops24h 00measyJet
Deal found 10/11£178
Thu 13/1110:10BHD - SOU
Nonstop1h 40mAer Lingus
Sat 15/1115:45SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 10/11£180
Thu 11/1218:05BFS - SOU
1 stop13h 35measyJet
Mon 15/1212:05SOU - BFS
1 stop8h 15measyJet
Deal found 10/11£194
Sat 15/1106:40BHD - SOU
Nonstop1h 45mMultiple Airlines
Mon 17/1112:05SOU - BHD
1 stop5h 10mMultiple Airlines
Deal found 10/11£197
Tue 16/1208:35BFS - SOU
1 stop24h 15measyJet
Sun 28/1218:20SOU - BFS
1 stop22h 40measyJet
Deal found 9/11£197

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 11 November 2025.

Round-trip from

£91

One-way from

£27

Popular in

June

Cheapest in

January

Average price

£50
Aer Lingus
  • Aer Lingus
  • 22/11-29/11
  • Nonstop
  • 3h 20m total
  • Northern Ireland to Portsmouth
Search Deals
easyJet
  • easyJet
  • 26/4
  • Nonstop
  • 1h 15m total
  • Northern Ireland to Portsmouth
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (£16 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 11 November 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

BHD - SOU

BHDSOU

Belfast City

Sat 22/11

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Sat 29/11

15:45-17:20

Nonstop1h 35m

£91

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Thu 11/12

10:10-11:50

Nonstop1h 40m

Southampton Eastleigh

Mon 15/12

19:00-20:35

Nonstop1h 35m

£111

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Thu 11/12

10:10-11:50

Nonstop1h 40m

Southampton Eastleigh

Mon 15/12

08:30-08:30

2 stops24h 00m

£146

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Thu 29/1

08:20-17:20

1 stop9h 00m

Southampton Eastleigh

Mon 2/2

19:00-20:35

Nonstop1h 35m

£154

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Tue 16/12

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Sun 28/12

19:00-20:35

Nonstop1h 35m

£156

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 11/12

19:45-19:20

2 stops23h 35m

Southampton Eastleigh

Mon 15/12

08:30-07:40

2 stops23h 10m

£157

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 29/1

13:35-17:20

1 stop3h 45m

Southampton Eastleigh

Mon 2/2

17:45-17:00

1 stop23h 15m

£165

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Thu 29/1

18:35-13:45

2 stops19h 10m

Southampton Eastleigh

Mon 2/2

08:30-08:55

2 stops24h 25m

£166

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Sat 22/11

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Sat 29/11

13:55-08:10

2 stops18h 15m

£176

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Thu 11/12

20:00-19:20

2 stops23h 20m

Southampton Eastleigh

Mon 15/12

08:30-08:30

2 stops24h 00m

£178

Flights are sorted by cheapest return flights first.

Deals found on 10/11

Showing 1-10 of 35 results
1
2
3
4

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, March is the cheapest month in which you can book a flight from Northern Ireland to Portsmouth (average of £14). Flying from Northern Ireland to Portsmouth in July is currently the most expensive (average of £48). 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 11 November 2025.

When flying from Northern Ireland to Portsmouth, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 43% versus a flight in the morning.

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

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

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

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 45m. Aer Lingus provides one of the quickest options available for as low as £91. Northern Ireland and Portsmouth are separated by a distance of 316 mi. This flight may include one or multiple stops.

  • 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, March is the cheapest month in which you can book a flight from Northern Ireland to Portsmouth (average of £14). Flying from Northern Ireland to Portsmouth in July is currently the most expensive (average of £48). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Northern Ireland to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
Gatwick to Edinburgh flights
Heathrow to Edinburgh flights
Stansted to Edinburgh flights
Luton to Edinburgh flights
London City to Edinburgh flights
Belfast Intl to Gatwick flights
Belfast Intl to Luton flights
Edinburgh to Heathrow flights
Edinburgh to Luton flights
Edinburgh to Gatwick flights
Glasgow Intl to Heathrow flights
Edinburgh to Stansted flights
Edinburgh to London City flights
Glasgow Intl to Gatwick flights
Glasgow Intl to Stansted flights
Glasgow Intl to Luton flights
Belfast Intl to Heathrow flights
Glasgow Intl to London City flights
Belfast City to Heathrow flights
Belfast Intl to Edinburgh flights
Birmingham to Edinburgh flights
Southend to Edinburgh flights
Bristol to Edinburgh flights
Belfast Intl to London City flights
Belfast City to Gatwick flights
Belfast City to London City flights
Southampton to Edinburgh flights
Belfast City to Luton flights
Belfast City to Stansted flights
Belfast City to Edinburgh flights
Belfast Intl to Stansted flights
Cardiff to Edinburgh flights
Belfast Intl to Manchester flights
Aberdeen to Heathrow flights
Aberdeen to Gatwick flights
Newcastle upon Tyne to Heathrow flights
Heathrow to Manchester flights
Manchester to Heathrow flights
Gatwick to Manchester flights
Belfast Intl to Liverpool flights
Heathrow to Newcastle upon Tyne flights
Belfast Intl to Birmingham flights
Newquay to Manchester flights
London City to Manchester flights
Aberdeen to London City flights
Stansted to Newcastle upon Tyne flights
Luton to Newcastle upon Tyne flights
Manchester to Gatwick flights
Belfast City to Manchester flights
Heathrow to Gatwick flights

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 11 November 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£21Average£55FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£28Average£95FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£49Average£65FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£73Average£160FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£78Average£159FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£136Average£208FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.