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

The cheapest airline one-way is easyJet, with whom users have recently found tickets for as low as £39. However, be on the lookout for offers from Aer Lingus and British Airways, as they are both options that can get you from Portsmouth to Northern Ireland for a low price.

In terms of precipitation, rainfall in Northern Ireland ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Northern Ireland when rainfall is around 50.0 mm.

If weather is an important factor for your trip to Northern Ireland, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

How far in advance should I book a flight from Portsmouth to Northern Ireland?

To save on the cost of your flight from Portsmouth to Northern Ireland, book at least 44 days before your planned departure. Booking around this time can save you about 171% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £63 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £108.

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

Our data shows that January tends to be the cheapest month to fly to Northern Ireland from Portsmouth. Users have commonly found prices around £62 for the month, but tickets can be as low as £26. Due to multiple factors, prepare for potentially higher prices in July.

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.

£39+ Flights from Portsmouth to Northern Ireland

Cheap flight deals from Portsmouth to Northern Ireland

Round-trip from	£83
One-way from	£39
Popular in	July
Cheapest in	January
Average price	£68

easyJet
12/7-19/7
Nonstop
2h 35m total
Portsmouth to Northern Ireland

Search Deals

easyJet
23/8
Nonstop
1h 20m total
Portsmouth to Northern Ireland

Search Deals

Highest demand for flights based on searches. 23% potential increase in price (£13 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 June 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 30 June 2025.

Sat 12/708:05SOU - BFS

Nonstop1h 20measyJet

Sat 19/706:20BFS - SOU

Nonstop1h 15measyJet

Deal found 28/6£83

Mon 10/1116:45SOU - BHD

Nonstop1h 35mAer Lingus

Mon 17/1106:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 28/6£87

Mon 1/920:00SOU - BFS

2 stops22h 45mMultiple Airlines

Sat 6/913:35BFS - SOU

Nonstop1h 15mMultiple Airlines

Deal found 29/6£133

Mon 10/1112:05SOU - BHD

1 stop5h 10measyJet

Mon 17/1117:45BHD - SOU

1 stop15h 05measyJet

Deal found 28/6£135

Thu 6/1108:55SOU - BHD

Nonstop1h 40mMultiple Airlines

Sat 8/1107:15BHD - SOU

1 stop5h 55mMultiple Airlines

Deal found 28/6£137

Sat 12/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Sat 19/706:40BHD - SOU

Nonstop1h 45mBritish Airways

Deal found 28/6£241

Mon 1/1217:20SOU - BHD

1 stop3h 40mKLM

Sun 7/1206:30BHD - SOU

1 stop10h 20mKLM

Deal found 28/6£266

Best flights from Portsmouth to Northern Ireland
Discover carefully curated flight deals from Portsmouth to Northern Ireland that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 30 June 2025.

Sat 12/708:05SOU - BFS

Nonstop1h 20measyJet

Sat 19/706:20BFS - SOU

Nonstop1h 15measyJet

Deal found 28/6£83

Mon 10/1116:45SOU - BHD

Nonstop1h 35mAer Lingus

Mon 17/1106:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 28/6£87

Mon 1/920:00SOU - BFS

2 stops22h 45mMultiple Airlines

Sat 6/913:35BFS - SOU

Nonstop1h 15mMultiple Airlines

Deal found 29/6£133

Sat 12/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Sat 19/706:40BHD - SOU

Nonstop1h 45mBritish Airways

Deal found 28/6£241

Mon 1/1217:20SOU - BHD

1 stop3h 40mKLM

Sun 7/1206:30BHD - SOU

1 stop10h 20mKLM

Deal found 28/6£266

Mon 10/1112:05SOU - BHD

1 stop5h 10measyJet

Mon 17/1117:45BHD - SOU

1 stop15h 05measyJet

Deal found 28/6£135

Thu 6/1108:55SOU - BHD

Nonstop1h 40mMultiple Airlines

Sat 8/1107:15BHD - SOU

1 stop5h 55mMultiple Airlines

Deal found 28/6£137

Direct flights from Portsmouth to Northern Ireland
Explore direct flight options from Portsmouth to Northern Ireland based on user searches, and compare prices and availability for your desired travel dates. Data last updated 30 June 2025.

Sat 12/708:05SOU - BFS

Nonstop1h 20measyJet

Sat 19/706:20BFS - SOU

Nonstop1h 15measyJet

Deal found 28/6£83

Mon 10/1116:45SOU - BHD

Nonstop1h 35mAer Lingus

Mon 17/1106:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 28/6£87

Sat 12/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Sat 19/706:40BHD - SOU

Nonstop1h 45mBritish Airways

Deal found 28/6£241

Last-minute flights from Portsmouth to Northern Ireland
Discover last-minute flight deals from Portsmouth to Northern Ireland. Data last updated 30 June 2025 and is based on user searches.

Sat 5/708:55SOU - BHD

Nonstop1h 35mAer Lingus

Tue 8/706:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 30/6£152

Sat 5/708:25SOU - BHD

1 stop8h 55mMultiple Airlines

Tue 8/706:40BHD - SOU

Nonstop1h 45mMultiple Airlines

Deal found 30/6£176

Mon 7/712:25SOU - BFS

Nonstop1h 20measyJet

Fri 11/710:30BFS - SOU

Nonstop1h 15measyJet

Deal found 28/6£183

Sat 12/708:05SOU - BFS

Nonstop1h 20measyJet

Sat 19/706:20BFS - SOU

Nonstop1h 15measyJet

Deal found 28/6£83

Sat 12/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Sat 19/706:40BHD - SOU

Nonstop1h 45mBritish Airways

Deal found 28/6£241

Mon 14/720:30SOU - BFS

2 stops14h 50mMultiple Airlines

Thu 17/718:45BFS - SOU

Nonstop1h 15mMultiple Airlines

Deal found 28/6£165

Wed 30/716:35SOU - BHD

Nonstop1h 35mAer Lingus

Wed 6/806:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 30/6£87

Wed 30/710:50SOU - BHD

1 stop3h 40mMultiple Airlines

Wed 6/806:40BHD - SOU

Nonstop1h 45mMultiple Airlines

Deal found 30/6£173

One-way flights from Portsmouth to Northern Ireland
Search for one-way flight options from Portsmouth to Northern Ireland. Find affordable one-way fares based on user searches. Data last updated 30 June 2025.

Sat 23/808:05SOU - BFS

Nonstop1h 20measyJet

Deal found 30/6£39

Sat 23/819:45SOU - BHD

Nonstop1h 30mAer Lingus

Deal found 30/6£58

Mon 14/720:30SOU - BFS

2 stops14h 50mMultiple Airlines

Deal found 28/6£109

Sat 23/808:25SOU - BHD

1 stop8h 55mMultiple Airlines

Deal found 30/6£118

Sat 23/808:25SOU - BHD

1 stop7h 25measyJet

Deal found 30/6£119

Sat 19/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Deal found 30/6£162

Sun 6/709:20SOU - BHD

1 stop11h 55mKLM

Deal found 29/6£270

Tue 8/712:30SOU - BHD

3 stops24h 25mLoganair

Deal found 30/6£922

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Sat 12/7

08:05-09:25

Nonstop1h 20m

Belfast Intl

Sat 19/7

06:20-07:35

Nonstop1h 15m

£83

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Mon 10/11

16:45-18:20

Nonstop1h 35m

Belfast City

Mon 17/11

06:40-08:25

Nonstop1h 45m

£87

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Mon 1/9

20:00-18:45

2 stops22h 45m

Belfast Intl

Sat 6/9

13:35-14:50

Nonstop1h 15m

£133

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Mon 10/11

12:05-17:15

1 stop5h 10m

Belfast City

Mon 17/11

17:45-08:50

1 stop15h 05m

£135

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 6/11

08:55-10:35

Nonstop1h 40m

Belfast City

Sat 8/11

07:15-13:10

1 stop5h 55m

£137

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sat 12/7

08:55-10:30

Nonstop1h 35m

Belfast City

Sat 19/7

06:40-08:25

Nonstop1h 45m

£241

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Mon 1/12

17:20-21:00

1 stop3h 40m

Belfast City

Sun 7/12

06:30-16:50

1 stop10h 20m

£266

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Sat 23/8

08:05-09:25

Nonstop1h 20m

£39

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sat 23/8

19:45-21:15

Nonstop1h 30m

£58

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Mon 14/7

20:30-11:20

2 stops14h 50m

£109

Flights are sorted by cheapest return flights first.

Deals found on 30/6

Showing 1-10 of 15 results

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?

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

Check out reviews from past customers who have flown with KLM, Aer Lingus, andeasyJet 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.

KLM

7.8

Good

1,365 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

KLM

7.8

Good

1,365 reviews

KLM

7.8

Good

1,365 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Aer Lingus

7.1

Good

1,140 reviews

KLM

7.8

Good

1,365 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

easyJet

6.9

Okay

1,819 reviews

KLM

7.8

Good

1,365 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

British Airways

6.6

Okay

7,081 reviews

KLM

7.8

Good

1,365 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

What are the cheapest airlines to fly from Portsmouth to Northern Ireland one-way?
The cheapest airline one-way is easyJet, with whom users have recently found tickets for as low as £39. However, be on the lookout for offers from Aer Lingus and British Airways, as they are both options that can get you from Portsmouth to Northern Ireland for a low price.
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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Portsmouth to Northern Ireland

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Direct flights to United Kingdom

Top 6 airlines flying from Portsmouth to Northern Ireland

Airline	Cheapest	Average	Flexibility	On-time
Ryanair	Cheapest£28	Average£54	FlexibilityNo cancel fee	On-timeN/A	Search Ryanair flights
easyJet	Cheapest£29	Average£76	FlexibilityNo cancel fee	On-time86%	Search easyJet flights
Ryanair	Cheapest£31	Average£59	FlexibilityNo cancel fee	On-timeN/A	Search Ryanair flights
Aer Lingus	Cheapest£53	Average£98	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£76	Average£152	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Loganair	Cheapest£126	Average£175	FlexibilityNo cancel fee	On-time79%	Search Loganair flights

Fly with Cheapflights

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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Cheap flights from Portsmouth to Northern Ireland from £39

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.

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 30 June 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Portsmouth to Northern Ireland

Cheapest flights from Portsmouth to Northern IrelandExplore 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 30 June 2025.

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 30 June 2025.

Cheapflights Fare Finder

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

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.

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?

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 30 June 2025.

Reviews of airlines servicing Northern Ireland

Check out reviews from past customers who have flown with KLM, Aer Lingus, andeasyJet 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.

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.

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

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

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

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

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

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 Portsmouth to Northern Ireland

See prices for flight routes from nearby airports that may be better suited for you.

Top 6 airlines flying from Portsmouth to Northern Ireland

Fly with Cheapflights

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How does Cheapflights help users find flights from Portsmouth to Northern Ireland?

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

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

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

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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 30 June 2025.