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Cheap flights from Ireland to Portsmouth from £31

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 30/9. Fares are subject to change and may not be available on all flights or dates of travel.
DUB — LHR
17 Oct — 24 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Ireland to Portsmouth

Keep the following information in mind while searching for Ireland to Portsmouth flight deals. Data was last updated 17 September 2025.

Round-trip from

£66

One-way from

£31

Popular in

December

Cheapest in

January

Average price

£70
Aer Lingus
  • Aer Lingus
  • 7/10-21/10
  • Nonstop
  • 3h 15m total
  • Ireland to Portsmouth
Search Deals
Aer Lingus
  • Aer Lingus
  • 30/9
  • Nonstop
  • 1h 40m total
  • Ireland to Portsmouth
Search Deals
High demand for flights, 15% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£2 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Ireland to Portsmouth

Cheapest flights from Ireland to Portsmouth
Explore the most affordable flight options available from Ireland to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2025.

Tue 7/1006:35DUB - SOU
Nonstop1h 40mAer Lingus
Tue 21/1020:00SOU - DUB
Nonstop1h 35mAer Lingus
Deal found 16/9£66
Thu 30/1007:00DUB - SOU
Nonstop1h 45mAer Lingus
Thu 6/1120:10SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 15/9£82
Fri 14/1107:00DUB - SOU
Nonstop1h 45mAer Lingus
Sun 16/1120:10SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 15/9£84
Thu 2/1007:00DUB - SOU
Nonstop1h 40mAer Lingus
Mon 6/1020:00SOU - DUB
Nonstop1h 35mAer Lingus
Deal found 16/9£85
Mon 22/1207:00DUB - SOU
Nonstop1h 45mAer Lingus
Thu 1/120:10SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 15/9£86
Fri 17/1007:00DUB - SOU
Nonstop1h 40mAer Lingus
Mon 20/1020:00SOU - DUB
Nonstop1h 35mAer Lingus
Deal found 16/9£98
Sat 1/1107:00DUB - SOU
Nonstop1h 45mAer Lingus
Mon 3/1120:10SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 15/9£99
Tue 14/1021:00DUB - SOU
1 stop11h 30mMultiple Airlines
Tue 21/1020:00SOU - DUB
Nonstop1h 35mMultiple Airlines
Deal found 16/9£104
Sat 1/1107:00DUB - SOU
Nonstop1h 45mAer Lingus
Sun 2/1120:10SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 15/9£105
Fri 24/1007:00DUB - SOU
Nonstop1h 40mAer Lingus
Sun 26/1020:10SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 15/9£113
Fri 3/1007:00DUB - SOU
Nonstop1h 40mAer Lingus
Sun 5/1009:10SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 15/9£117
Sat 4/1007:00DUB - SOU
Nonstop1h 40mAer Lingus
Mon 6/1020:00SOU - DUB
Nonstop1h 35mAer Lingus
Deal found 15/9£117

Cheapflights Fare Finder

 
Customise your flight search to find flights from 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 17 September 2025.
Use the filters below to find and compare flights from Ireland to Portsmouth that are best for you.

Fly from

Ireland

Fly to

Portsmouth

Route

Depart

Return

Price

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Tue 7/10

06:35-08:15

Nonstop1h 40m

Southampton Eastleigh

Tue 21/10

20:00-21:35

Nonstop1h 35m

£66

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Mon 9/2

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Thu 12/2

20:10-21:50

Nonstop1h 40m

£84

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Mon 9/2

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Fri 13/2

20:10-21:50

Nonstop1h 40m

£86

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Sat 1/11

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Mon 3/11

20:10-21:50

Nonstop1h 40m

£99

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Sat 1/11

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Sun 2/11

20:10-21:50

Nonstop1h 40m

£105

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Fri 24/10

07:00-08:40

Nonstop1h 40m

Southampton Eastleigh

Sun 26/10

20:10-21:50

Nonstop1h 40m

£113

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Sat 1/11

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Mon 3/11

12:05-21:30

1 stop9h 25m

£127

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Tue 7/10

06:50-15:15

2 stops8h 25m

Southampton Eastleigh

Tue 21/10

20:00-21:35

Nonstop1h 35m

£151

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Mon 9/2

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Thu 12/2

15:05-19:00

1 stop3h 55m

£152

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Thu 13/11

04:25-19:20

2 stops14h 55m

Southampton Eastleigh

Sun 16/11

20:10-21:50

Nonstop1h 40m

£169

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 32 results
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4

Best time to book a flight from Ireland to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from 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 Ireland to Portsmouth

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

Currently, January is the cheapest month in which you can book a flight from Ireland to Portsmouth (average of £112). Flying from 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 IE to P0R?

Find hourly flight availability from 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 17 September 2025.

When flying from 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.

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

Use this chart to determine the cheapest time to fly return from Ireland to Portsmouth. Price data was last updated on 16 December 2024.

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

Weekly flight availability from Ireland to Portsmouth

Explore weekly flight availability from Ireland to Portsmouth. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 17 September 2025.

The most flights from IE0 to P0R are scheduled on a Wednesday (81 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (45 on average).

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 17 September 2025.
See what other customers who have flown with Aer Lingus from Ireland to Portsmouth have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,274 reviews
Check prices

Comfort

7.1

Food

6.5

Crew

8.0

Entertainment

6.9

Boarding

7.3

Overall

7.2

Reviews

1 / 20
4.0
Okay

Anonymous,Jul 2025

DUB - ORD

The inability to check in with the final leg of our flight via the Aers Lingus app led to a stressful trip as the final leg was overbooked and we were not able to confirm a seat until we had arrived to Chicago. Lack of earphones for the "entertainment" system were not voluntarily provided or even referenced as available (even for a charge) while boarding the plane - this seems like an oversight.
Aer Lingus
7.2
Good
1,274 reviews
Aer Lingus
7.2
Good
1,274 reviews
Check prices

Comfort

7.1

Food

6.5

Crew

8.0

Entertainment

6.9

Boarding

7.3

Overall

7.2

Reviews

1 / 20
4.0
Okay

Anonymous,Jul 2025

DUB - ORD

The inability to check in with the final leg of our flight via the Aers Lingus app led to a stressful trip as the final leg was overbooked and we were not able to confirm a seat until we had arrived to Chicago. Lack of earphones for the "entertainment" system were not voluntarily provided or even referenced as available (even for a charge) while boarding the plane - this seems like an oversight.

Related info for your journey

Find useful and relevant information for your journey from 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 Ireland to Portsmouth?

    Departing from Ireland to Portsmouth will take you 1h 40m. The distance between Ireland and Portsmouth is about 268 mi. All flights are typically direct.

  • What are the most popular routes from Ireland to Portsmouth?

    When deciding which route to take from Ireland to Portsmouth consider Dublin - Southampton Eastleigh, Cork - Southampton Eastleigh or Knock Intl - Southampton Eastleigh as they are the most popular.

  • What are the most reliable airlines from Ireland to Portsmouth?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Ireland to Portsmouth on time: Air Canada (78%), American Airlines (73%), British Airways (73%).

  • What are the cheapest flights from Ireland to Portsmouth?

    The cheapest flight price from Ireland to Portsmouth is £52. On average you can expect to pay £1,246. The most popular route, (Dublin - Southampton Eastleigh), can usually be booked for £66.

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

    Yes. In addition to deals on Ireland to Portsmouth flights, Cheapflights offers holiday packages that include both flights and hotel.

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

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ireland to Portsmouth.

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

    Yes. Cheapflights offers flight deals from 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 Ireland to Portsmouth?

    Currently, January is the cheapest month in which you can book a flight from Ireland to Portsmouth (average of £112). Flying from 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 Ireland to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Ireland to Portsmouth

Discover the top 3 airlines that operate flights from 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 17 September 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£26Average£75FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
British AirwaysCheapest£57Average£137FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£70Average£138FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus 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 Ireland to Portsmouth?

Cheapflights makes it easy to find Ireland to Portsmouth flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Ireland to Portsmouth.

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

Yes! Cheapflights helps users easily find flights from Ireland to Portsmouth with no change fees.

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

Not ready to book yet? You can track prices for flights from Ireland to Portsmouth on Cheapflights with our Price Alert feature and get notified when better prices are available.

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