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Cheap flights from Ireland to Portsmouth 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 19/11. Fares are subject to change and may not be available on all flights or dates of travel.
DUB — LHR
7 Sep — 14 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ireland to Portsmouth

Enter your travel dates to find the best prices.

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 8 August 2026.

Sat 19/917:50 -
Nonstop1h 40m
Sat 26/920:00 -
Nonstop1h 35m
Deal found 5/8£94
Wed 9/915:10 -
Nonstop1h 40m
Mon 14/920:00 -
Nonstop1h 35m
Deal found 3/8£96
Tue 1/917:50 -
Nonstop1h 40m
Tue 8/920:00 -
Nonstop1h 35m
Deal found 4/8£98
Sun 23/806:55 -
Nonstop1h 40m
Wed 26/820:00 -
Nonstop1h 35m
Deal found 8/8£99
Thu 27/807:00 -
Nonstop1h 40m
Sun 30/820:00 -
Nonstop1h 35m
Deal found 3/8£99
Wed 2/917:50 -
Nonstop1h 40m
Wed 9/920:00 -
Nonstop1h 35m
Deal found 4/8£102
Sat 31/1014:45 -
Nonstop1h 50m
Sat 7/1108:20 -
1 stop14h 10m
Deal found 6/8£105
Wed 19/806:25 -
Nonstop1h 40m
Tue 25/820:00 -
Nonstop1h 35m
Deal found 4/8£108
Sat 7/1107:00 -
Nonstop1h 40m
Tue 10/1120:00 -
Nonstop1h 35m
Deal found 6/8£109
Fri 4/1217:50 -
Nonstop1h 40m
Sun 6/1220:00 -
Nonstop1h 35m
Deal found 6/8£110
Mon 21/909:00 -
2 stops27h 50m
Mon 28/912:25 -
2 stops20h 00m
Deal found 7/8£148
Fri 25/906:05 -
2 stops25h 15m
Tue 29/918:10 -
1 stop14h 35m
Deal found 4/8£157

Find flight deals from Ireland to Portsmouth

Keep the following information in mind while searching for Ireland to Portsmouth flight deals. Data was last updated 8 August 2026.

Round-trip from

£94

One-way from

£39

Popular in

June

Cheapest in

January

Average price

£71
Aer Lingus
  • Aer Lingus
  • 19/9-26/9
  • Nonstop
  • 3h 15m total
  • Ireland to Portsmouth
Search Deals
Aer Lingus
  • Aer Lingus
  • 19/11
  • Nonstop
  • 1h 40m total
  • Ireland to Portsmouth
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£6 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£2 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

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 8 August 2026.
Use the filters below to find and compare flights from Ireland to Portsmouth that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

DublinSouthampton

DUB Dublin - SOU Southampton Eastleigh

DUBSOU

Dublin

Sat 22/8

17:50-19:30

Nonstop1h 40m

Southampton Eastleigh

Wed 26/8

20:00-21:35

Nonstop1h 35m

£125

DublinSouthampton

DUB Dublin - SOU Southampton Eastleigh

DUBSOU

Dublin

Wed 2/9

17:50-19:30

Nonstop1h 40m

Southampton Eastleigh

Sat 5/9

07:50-15:00

1 stop7h 10m

£128

DublinSouthampton

DUB Dublin - SOU Southampton Eastleigh

DUBSOU

Dublin

Thu 3/9

15:10-16:50

Nonstop1h 40m

Southampton Eastleigh

Tue 8/9

18:10-21:25

2 stops27h 15m

£137

DublinSouthampton

DUB Dublin - SOU Southampton Eastleigh

DUBSOU

Dublin

Thu 27/8

17:20-08:45

1 stop15h 25m

Southampton Eastleigh

Sun 30/8

09:15-08:20

1 stop23h 05m

£147

KnockSouthampton

NOC Knock Intl - SOU Southampton Eastleigh

NOCSOU

Knock Intl

Mon 21/9

09:00-12:50

2 stops27h 50m

Southampton Eastleigh

Mon 28/9

12:25-08:25

2 stops20h 00m

£148

DublinSouthampton

DUB Dublin - SOU Southampton Eastleigh

DUBSOU

Dublin

Sat 7/11

08:50-17:00

1 stop8h 10m

Southampton Eastleigh

Tue 10/11

08:40-12:40

1 stop4h 00m

£151

DublinSouthampton

DUB Dublin - SOU Southampton Eastleigh

DUBSOU

Dublin

Wed 9/9

11:10-16:50

1 stop5h 40m

Southampton Eastleigh

Wed 16/9

17:20-22:25

1 stop5h 05m

£151

CorkSouthampton

ORK Cork - SOU Southampton Eastleigh

ORKSOU

Cork

Fri 25/9

06:05-07:20

2 stops25h 15m

Southampton Eastleigh

Tue 29/9

18:10-08:45

1 stop14h 35m

£157

DublinSouthampton

DUB Dublin - SOU Southampton Eastleigh

DUBSOU

Dublin

Fri 21/8

05:55-17:35

1 stop11h 40m

Southampton Eastleigh

Sat 22/8

17:30-22:25

1 stop4h 55m

£170

KnockSouthampton

NOC Knock Intl - SOU Southampton Eastleigh

NOCSOU

Knock Intl

Sun 6/9

15:40-08:40

2 stops17h 00m

Southampton Eastleigh

Sun 13/9

12:35-10:30

2 stops21h 55m

£191

Flights are sorted by cheapest return flights first.

Deals found on 6/8

Showing 1-10 of 34 resultsSorted by cheapest first
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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 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 8 August 2026.

When flying from Ireland to Portsmouth, the time of day you fly usually plays a role in the price. Save by searching for a flight at midday, which can drop the price by up to 39% versus a flight in the afternoon.

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 8 August 2026.

The most flights from IE0 to P0R are scheduled on a Friday (78 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (42 on average).

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 1 August 2026.

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

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 8 August 2026.
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
7.3
Good
1,691 reviews
Check prices

Entertainment

7.0

Comfort

7.2

Food

6.7

Crew

8.1

Overall

7.3

Boarding

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2026

DUB - BCN

Would have been nice to have a plane that was equipped with a screen to watch a movie enroute to Barcelona, but all good. Flight and crew was excellent. Much appreciated the updates from captain and Kayak about the flight delay due the weather. It’s nice to be kept informed. Will Aer Lingus for future flights, and definitely through Kayak
Aer Lingus
7.3
Good
1,691 reviews
Aer Lingus
7.3
Good
1,691 reviews
Check prices

Entertainment

7.0

Comfort

7.2

Food

6.7

Crew

8.1

Overall

7.3

Boarding

7.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2026

DUB - BCN

Would have been nice to have a plane that was equipped with a screen to watch a movie enroute to Barcelona, but all good. Flight and crew was excellent. Much appreciated the updates from captain and Kayak about the flight delay due the weather. It’s nice to be kept informed. Will Aer Lingus for future flights, and definitely through Kayak

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. This flight may include one or multiple stops.

  • 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 (76%), Aer Lingus (68%), British Airways (67%).

  • What are the cheapest flights from Ireland to Portsmouth?

    The cheapest flight price from Ireland to Portsmouth is £56. On average you can expect to pay £1,521. The most popular route, (Dublin - Southampton Eastleigh), can usually be booked for £105.

  • 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.

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 8 August 2026.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£28Average£87FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
British AirwaysCheapest£73Average£156FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£82Average£140FlexibilityNo 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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