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Cheap flights from Northern Ireland to Portsmouth from £42

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LHR
8 Jul — 15 Jul1
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 3 July 2025.

Round-trip from

£42

Popular in

June

Cheapest in

January

Average price

£86
easyJet
  • easyJet
  • 23/8-30/8
  • Nonstop
  • 2h 35m total
  • Northern Ireland to Portsmouth
Search Deals
Highest demand for flights based on searches. 26% potential increase in price (£16 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (£4 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

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 3 July 2025.

Sat 23/806:20BFS - SOU
Nonstop1h 15measyJet
Sat 30/808:05SOU - BFS
Nonstop1h 20measyJet
Deal found 2/7£44
Tue 29/714:30BHD - SOU
Nonstop1h 35mAer Lingus
Thu 31/708:55SOU - BHD
Nonstop1h 35mAer Lingus
Deal found 2/7£88
Thu 4/906:40BHD - SOU
Nonstop1h 45mMultiple Airlines
Sat 6/908:25SOU - BHD
1 stop8h 55mMultiple Airlines
Deal found 30/6£126
Sat 23/808:35BFS - SOU
2 stops23h 10mMultiple Airlines
Sat 30/808:05SOU - BFS
Nonstop1h 20mMultiple Airlines
Deal found 1/7£182
Sat 9/806:40BHD - SOU
Nonstop1h 45mBritish Airways
Sun 10/808:55SOU - BHD
Nonstop1h 35mBritish Airways
Deal found 2/7£227

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 3 July 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 23/8

06:20-07:35

Nonstop1h 15m

Southampton Eastleigh

Sat 30/8

08:05-09:25

Nonstop1h 20m

£42

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Tue 29/7

14:30-16:05

Nonstop1h 35m

Southampton Eastleigh

Thu 31/7

08:55-10:30

Nonstop1h 35m

£88

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Thu 4/9

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Sat 6/9

08:25-17:20

1 stop8h 55m

£126

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 23/8

08:35-07:45

2 stops23h 10m

Southampton Eastleigh

Sat 30/8

08:05-09:25

Nonstop1h 20m

£182

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Sat 9/8

06:40-08:25

Nonstop1h 45m

Southampton Eastleigh

Sun 10/8

08:55-10:30

Nonstop1h 35m

£227

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Sun 7/9

06:40-08:25

Nonstop1h 45m

£52

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 15/9

06:40-10:35

1 stop3h 55m

£55

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Sun 7/9

18:45-10:35

1 stop15h 50m

£104

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sun 7/9

08:40-09:10

2 stops24h 30m

£109

BelfastSouthampton

BHD - SOU

BHDSOU

Belfast City

Mon 13/10

14:30-16:05

Nonstop1h 35m

£436

Flights are sorted by cheapest return flights first.

Deals found on 2/7

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 3 July 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.

Reviews of airlines servicing Portsmouth

Get insights into the airlines that provide service to Portsmouth. 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 Portsmouth. Reviews last updated 3 July 2025.
See what other customers who have flown with Aer Lingus, easyJet, andBritish Airways from Northern Ireland to Portsmouth have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.1
Good
1,144 reviews
Check prices

Overall

7.1

Crew

8.0

Comfort

7.0

Food

6.4

Boarding

7.2

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Tim Hunter,May 2025

LHR - DUB

In the economy section one of the bathrooms was reserved for first class which made for very long lines in for the bathrooms. The temperature for the flight was very cold. I ended up catching a mild cold on the way home. No blankets were handed out / offered. The food service was OK but no napkins were given with the meals -- very weird. The crew as OK but definitely not nice and welcoming.
Aer Lingus
7.1
Good
1,144 reviews
Aer Lingus
7.1
Good
1,144 reviews
Check prices

Overall

7.1

Crew

8.0

Comfort

7.0

Food

6.4

Boarding

7.2

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Tim Hunter,May 2025

LHR - DUB

In the economy section one of the bathrooms was reserved for first class which made for very long lines in for the bathrooms. The temperature for the flight was very cold. I ended up catching a mild cold on the way home. No blankets were handed out / offered. The food service was OK but no napkins were given with the meals -- very weird. The crew as OK but definitely not nice and welcoming.
easyJet
6.9
Okay
1,819 reviews
Aer Lingus
7.1
Good
1,144 reviews
Check prices

Overall

7.1

Crew

8.0

Comfort

7.0

Food

6.4

Boarding

7.2

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Tim Hunter,May 2025

LHR - DUB

In the economy section one of the bathrooms was reserved for first class which made for very long lines in for the bathrooms. The temperature for the flight was very cold. I ended up catching a mild cold on the way home. No blankets were handed out / offered. The food service was OK but no napkins were given with the meals -- very weird. The crew as OK but definitely not nice and welcoming.
British Airways
6.6
Okay
7,089 reviews
Aer Lingus
7.1
Good
1,144 reviews
Check prices

Overall

7.1

Crew

8.0

Comfort

7.0

Food

6.4

Boarding

7.2

Entertainment

6.8

Reviews

1 / 20
6.0
Good

Tim Hunter,May 2025

LHR - DUB

In the economy section one of the bathrooms was reserved for first class which made for very long lines in for the bathrooms. The temperature for the flight was very cold. I ended up catching a mild cold on the way home. No blankets were handed out / offered. The food service was OK but no napkins were given with the meals -- very weird. The crew as OK but definitely not nice and welcoming.

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.

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

    For one-way options, check prices for Aer Lingus. According to our data, you can fly for as low as £52. Users have also found prices from £55 and £436 on easyJet 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, 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 3 July 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£29Average£49FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£29Average£88FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£32Average£55FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£58Average£112FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£73Average£150FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£128Average£226FlexibilityNo 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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