Cheap flights from Northern Ireland to Portsmouth from £23

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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LHR
4 May — 11 May1
1 adult
1 adult, Economy, 0 bags

Cheap 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 4 April 2026.

Sun 17/510:20
BFS
-
SOU
Nonstop1h 15m
easyJet
Mon 18/512:25
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 1/4£61
Fri 17/417:25
BHD
-
SOU
Nonstop1h 35m
Aer Lingus
Thu 7/519:30
SOU
-
BHD
Nonstop1h 35m
Aer Lingus
Deal found 2/4£66
Sat 25/410:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Sun 26/412:35
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 31/3£67
Thu 14/506:40
BHD
-
SOU
Nonstop1h 45m
Aer Lingus
Sat 16/512:35
SOU
-
BHD
Nonstop1h 35m
Aer Lingus
Deal found 2/4£69
Thu 9/406:40
BHD
-
SOU
Nonstop1h 45m
Aer Lingus
Fri 10/408:55
SOU
-
BHD
Nonstop1h 40m
Aer Lingus
Deal found 1/4£70
Sat 19/910:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Sat 26/912:15
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 31/3£90
Fri 17/410:35
BFS
-
SOU
Nonstop1h 15m
easyJet
Sun 19/412:35
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 2/4£95
Sat 19/914:40
BHD
-
SOU
Nonstop1h 35m
Aer Lingus
Sat 26/908:55
SOU
-
BHD
Nonstop1h 40m
Aer Lingus
Deal found 31/3£95
Thu 4/606:40
BHD
-
SOU
Nonstop1h 45m
Aer Lingus
Thu 4/619:30
SOU
-
BHD
Nonstop1h 35m
Aer Lingus
Deal found 4/4£101
Sat 5/910:25
BHD
-
SOU
Nonstop1h 40m
Aer Lingus
Sat 12/908:55
SOU
-
BHD
Nonstop1h 40m
Aer Lingus
Deal found 2/4£115
Sat 5/910:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Sat 12/907:50
SOU
-
BFS
1 stop14h 00m
easyJet
Deal found 2/4£116
Mon 18/510:35
BFS
-
SOU
Nonstop1h 15m
easyJet
Mon 25/512:25
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 3/4£122

Find 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 4 April 2026.

Round-trip from

£61

One-way from

£23

Popular in

June

Cheapest in

November

Average price

£71
easyJet
  • easyJet
  • 17/5-18/5
  • Nonstop
  • 2h 30m total
  • Northern Ireland to Portsmouth
easyJet
  • easyJet
  • 12/7
  • Nonstop
  • 1h 15m total
  • Northern Ireland to Portsmouth
Highest demand for flights based on searches. 22% potential increase in price (£15 potential increase over avg. return price).
Cheapest flight prices on average. 6% potential price decrease (£3 potential savings vs. average return price).
Average for round-trip flights in April 2026

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 4 April 2026.
Use the filters below to find and compare flights from Northern Ireland to Portsmouth that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sun 17/5

10:20-11:35

Nonstop1h 15m

Southampton Eastleigh

Mon 18/5

12:25-13:40

Nonstop1h 15m

£61

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 18/5

10:35-11:50

Nonstop1h 15m

Southampton Eastleigh

Mon 25/5

12:25-13:40

Nonstop1h 15m

£122

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 5/9

10:30-11:45

Nonstop1h 15m

Southampton Eastleigh

Sat 12/9

12:15-13:30

Nonstop1h 15m

£131

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 18/4

22:25-09:25

1 stop11h 00m

Southampton Eastleigh

Sat 25/4

12:15-13:30

Nonstop1h 15m

£141

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sun 19/4

10:50-12:05

Nonstop1h 15m

Southampton Eastleigh

Thu 23/4

11:40-15:55

1 stop4h 15m

£151

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Fri 17/4

10:35-11:50

Nonstop1h 15m

Southampton Eastleigh

Thu 7/5

06:50-15:20

1 stop8h 30m

£164

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Tue 5/5

08:00-19:30

2 stops11h 30m

Southampton Eastleigh

Tue 12/5

18:10-15:15

2 stops21h 05m

£175

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sun 5/7

10:50-12:05

Nonstop1h 15m

Southampton Eastleigh

Sun 12/7

12:35-13:50

Nonstop1h 15m

£179

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Thu 9/7

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Mon 13/7

12:35-14:10

Nonstop1h 35m

£218

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Thu 16/4

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Sat 18/4

12:35-14:10

Nonstop1h 35m

£231

Flights are sorted by cheapest return flights first.

Deals found on 4/4

Showing 1-10 of 35 resultsSorted by cheapest first
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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, February 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 £45). 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 4 April 2026.

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 47% versus a flight in the afternoon.

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 28 March 2026.

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

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 £61. Northern Ireland and Portsmouth are separated by a distance of 326 mi. All flights are typically direct.

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

    For one-way options, check prices for easyJet. According to our data, you can fly for as low as £26. Users have also found prices from £45 and £87 on Aer Lingus and British Airways, respectively.

  • 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, February 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 £45). 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.

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 4 April 2026.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£19Average£57FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£20Average£99FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£40Average£80FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£77Average£158FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£86Average£173FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£140Average£203FlexibilityNo cancel feeOn-time79%
Search Loganair flights

Fly with Cheapflights

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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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