Cheap flights from Northern Ireland to Portsmouth

BFS — LHR
22 Mar — 29 Mar1
1 adult
1 adult, Economy, 0 bags

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 20 February 2026.

Round-trip from

£53

One-way from

£22

Popular in

June

Cheapest in

March

Average price

£57
easyJet
  • easyJet
  • 29/3-30/3
  • Nonstop
  • 2h 30m total
  • Northern Ireland to Portsmouth
easyJet
  • easyJet
  • 26/4
  • Nonstop
  • 1h 15m total
  • Northern Ireland to Portsmouth
Highest demand for flights based on searches. 22% potential increase in price (£14 potential increase over avg. return price).
Cheapest flight prices on average. 4% potential price decrease (£3 potential savings vs. average return price).
Average for round-trip flights in February 2026

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 £13). Flying from Northern Ireland to Portsmouth in July is currently the most expensive (average of £47). 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 20 February 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 17 February 2026.

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 15m. easyJet provides one of the quickest options available for as low as £53. 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 £41 and £85 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 £13). Flying from Northern Ireland to Portsmouth in July is currently the most expensive (average of £47). 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.

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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 20 February 2026.
AirlineCheapestAverageFlexibilityOn-time
easyJetCheapest£18Average£95FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£18Average£56FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
RyanairCheapest£48Average£63FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£76Average£153FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£83Average£164FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£136Average£211FlexibilityNo cancel feeOn-time79%
Search Loganair flights

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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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