Find flights
When to book
Airlines

Cheap flights from Portsmouth to Northern Ireland

LHR — BFS
25 Nov — 2 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Portsmouth to Northern Ireland

Popular in

July

Cheapest in

January

Average price

£74
Highest demand for flights based on searches. 24% potential increase in price (£18 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 October 2026
Search Deals

Cheapflights Insights

Everything you need to know about your flight from Portsmouth to Northern Ireland

What is the cheapest time of day to fly from P0R to NIR?

One of the essential ways to save on airfare from Portsmouth to Northern Ireland is to remain as flexible as possible. Flights that are at midday tend to be the most expensive. A flight in the morning could potentially save you up to 40% on airfare.

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

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

Reviews of airlines servicing Northern Ireland

Check out reviews from past customers who have flown with Aer Lingus and easyJet 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.
Aer Lingus
7.3
Good
1,858 reviews
Check prices

Boarding

7.5

Overall

7.3

Entertainment

7.1

Comfort

7.2

Crew

8.1

Food

6.7

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.
Aer Lingus
7.3
Good
1,858 reviews
Aer Lingus
7.3
Good
1,858 reviews
Check prices

Boarding

7.5

Overall

7.3

Entertainment

7.1

Comfort

7.2

Crew

8.1

Food

6.7

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.
easyJet
6.9
Okay
1,922 reviews
Aer Lingus
7.3
Good
1,858 reviews
Check prices

Boarding

7.5

Overall

7.3

Entertainment

7.1

Comfort

7.2

Crew

8.1

Food

6.7

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.

Related info for your journey

  • 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.

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Portsmouth to Northern Ireland

Gatwick to Edinburgh flights
Stansted to Edinburgh flights
Luton to Edinburgh flights
Gatwick to Belfast Intl flights
Heathrow to Edinburgh flights
Gatwick to Glasgow Intl flights
Stansted to Glasgow Intl flights
London City to Edinburgh flights
Luton to Belfast Intl flights
Heathrow to Glasgow Intl flights
Gatwick to Manchester flights
Luton to Glasgow Intl flights
Luton to Manchester flights
Stansted to Manchester flights
London City to Manchester flights
Edinburgh to Stansted flights
Manchester to London City flights
Manchester to Stansted flights
Manchester to Luton flights
Manchester to Gatwick flights
Edinburgh to Luton flights
Edinburgh to Gatwick flights
Manchester to Heathrow flights
Manchester to Southend flights
Heathrow to Belfast City flights
Southend to Manchester flights
Edinburgh to Glasgow Intl flights
Gatwick to Belfast City flights
London City to Belfast Intl flights
London City to Belfast City flights
Edinburgh to Heathrow flights
Heathrow to Manchester flights
Stansted to Belfast City flights
Manchester to Belfast Intl flights
Luton to Belfast City flights
Edinburgh to London City flights
Edinburgh to Southend flights
Birmingham to Belfast Intl flights
London City to Glasgow Intl flights
Edinburgh to Belfast Intl flights
Newcastle upon Tyne to Gatwick flights
Newcastle upon Tyne to Luton flights
Newcastle upon Tyne to London City flights
Newcastle upon Tyne to Stansted flights
Stansted to Belfast Intl flights
Bristol to Edinburgh flights
Manchester to Belfast City flights
Heathrow to Belfast Intl flights
Newcastle upon Tyne to Southend flights
Southend to Glasgow Intl flights

Top 5 airlines flying from Portsmouth to Northern Ireland

AirlineCheapestAverageFlexibilityOn-time
easyJetCheapest£14Average£82FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£19Average£71FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£81Average£131FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£96Average£181FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£142Average£257FlexibilityNo cancel feeOn-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!

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.