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Cheap flights from Dublin to Portsmouth from £40

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 7/12. Fares are subject to change and may not be available on all flights or dates of travel.
DUB — LHR
14 Dec — 21 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Dublin to Portsmouth are usually found in December or January, booked 19 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

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Cheapest flights from Dublin to Portsmouth
Explore the most affordable flight options available from Dublin to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 November 2025.

Tue 2/1210:10DUB - SOU
Nonstop1h 45mAer Lingus
Wed 3/1212:25SOU - DUB
Nonstop1h 35mAer Lingus
Deal found 13/11£81
Thu 4/1207:00DUB - SOU
Nonstop1h 45mAer Lingus
Mon 8/1209:30SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 13/11£98
Sat 13/1207:00DUB - SOU
Nonstop1h 45mAer Lingus
Mon 15/1220:10SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 13/11£99
Mon 17/1107:00DUB - SOU
Nonstop1h 45mAer Lingus
Wed 19/1116:05SOU - DUB
Nonstop1h 35mAer Lingus
Deal found 13/11£107
Sat 13/1207:00DUB - SOU
Nonstop1h 45mMultiple Airlines
Mon 15/1212:05SOU - DUB
1 stop12h 30mMultiple Airlines
Deal found 13/11£116
Thu 11/1207:00DUB - SOU
Nonstop1h 45mMultiple Airlines
Mon 15/1212:05SOU - DUB
1 stop5h 35mMultiple Airlines
Deal found 13/11£121
Thu 4/1207:00DUB - SOU
Nonstop1h 45mMultiple Airlines
Mon 8/1212:05SOU - DUB
1 stop9h 25mMultiple Airlines
Deal found 12/11£122
Sat 20/1207:00DUB - SOU
Nonstop1h 45mAer Lingus
Tue 30/1220:10SOU - DUB
Nonstop1h 40mAer Lingus
Deal found 13/11£138

Cheap flight deals from Dublin to Portsmouth

Keep the following information in mind while searching for Dublin to Portsmouth flight deals. Data was last updated 14 November 2025.

Round-trip from

£81

One-way from

£40

Popular in

June

Cheapest in

December

Average price

£121
Aer Lingus
  • Aer Lingus
  • 2/12-3/12
  • Nonstop
  • 3h 20m total
  • Dublin to Portsmouth
Search Deals
Aer Lingus
  • Aer Lingus
  • 7/12
  • Nonstop
  • 1h 45m total
  • Dublin to Portsmouth
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£30 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£4 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Dublin 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 14 November 2025.
Use the filters below to find and compare flights from Dublin to Portsmouth that are best for you.

Fly from

Dublin

Fly to

Portsmouth

Route

Depart

Return

Price

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Thu 4/12

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Mon 8/12

20:10-21:50

Nonstop1h 40m

£81

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Fri 13/2

18:00-19:40

Nonstop1h 40m

Southampton Eastleigh

Sun 15/2

20:10-21:50

Nonstop1h 40m

£90

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Sat 13/12

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Mon 15/12

20:10-21:50

Nonstop1h 40m

£99

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Wed 7/1

10:10-11:55

Nonstop1h 45m

Southampton Eastleigh

Thu 8/1

17:55-22:25

1 stop4h 30m

£112

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Mon 16/3

13:55-15:35

Nonstop1h 40m

Southampton Eastleigh

Fri 20/3

20:10-21:50

Nonstop1h 40m

£122

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Sat 10/1

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Sun 11/1

18:20-23:15

1 stop4h 55m

£122

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Sat 17/1

07:00-14:50

1 stop7h 50m

Southampton Eastleigh

Sun 18/1

20:10-21:50

Nonstop1h 40m

£131

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Mon 16/3

20:35-08:50

1 stop12h 15m

Southampton Eastleigh

Fri 20/3

20:10-21:50

Nonstop1h 40m

£138

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Fri 12/12

07:00-08:45

Nonstop1h 45m

Southampton Eastleigh

Sun 21/12

18:05-22:10

1 stop4h 05m

£166

DublinSouthampton

DUB - SOU

DUBSOU

Dublin

Sun 7/12

07:00-08:45

Nonstop1h 45m

£40

Flights are sorted by cheapest return flights first.

Deals found on 12/11

Showing 1-10 of 20 results
1
2

Best time to book a flight from Dublin to Portsmouth

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

How far ahead should I book a flight from Dublin to Portsmouth?

Use this chart to determine the optimal time to book a return flight from Dublin to Portsmouth. Price data was last updated on 7 November 2025.

Booking 19 days in advance of your planned departure date is, on average, the best time to get cheap flights from Dublin to Portsmouth. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, February is the cheapest month in which you can book a flight from Dublin to Portsmouth (average of £26). Flying from Dublin to Portsmouth in December is currently the most expensive (average of £37). 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 DUB to P0R?

Find hourly flight availability from Dublin 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 14 November 2025.

It’s optimal to fly from Dublin to Portsmouth in the evening. By choosing this option you can save up to 47% on the cost of your flight, compared to a flight in the afternoon.

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

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

Travellers seeking maximum savings on their Dublin to Portsmouth flight should consider departing on Monday at midday 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.

Weekly flight availability from Dublin to Portsmouth

Explore weekly flight availability from Dublin 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 14 November 2025.

The most flights from DUB to P0R are scheduled on a Thursday (69 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (40 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 14 November 2025.
Get a feel of what it's like to fly with Aer Lingus from Dublin to Portsmouth by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,370 reviews
Check prices

Overall

7.2

Boarding

7.4

Entertainment

6.9

Food

6.6

Comfort

7.1

Crew

8.0

Reviews

1 / 20
6.0
Good

David,Oct 2025

DUB - IAD

Two issues... 1. The Aer Lingus check-in counter in Lisbon did not open until 90 minutes prior to the flight. Huge line of customers waiting to check-in and very time consuming. Plus, having to clear security, passport control, and take the shuttle bus to the plane takes a long time. Consequently, the flight was delayed due to passengers not being able to get to the gate on time. I showed up four hours early but had to wait for over two hours just for the check-in counter to open. Many passengers complaining about the same issue. VERY STRESSFUL! 2. During the flight from Dublin to Washington (Flight EI 119 on October 25, 2025) one of the flight attendants (Glen) was quite rude to a parent of a non-verbal autistic child. At one point I heard him say in a nasty tone, "You have three seconds to put your bag under the seat or I will take it and check it. 3, 2, 1!" I did not speak to the flight attendant because I was afraid he would kick me off the flight. Very unpleasant to everyone before take off also while instructing them to put the seats up and bags under. Beyond being firm and actually nasty and rude. A little interpersonal communication training could help this man.
Aer Lingus
7.2
Good
1,370 reviews
Aer Lingus
7.2
Good
1,370 reviews
Check prices

Overall

7.2

Boarding

7.4

Entertainment

6.9

Food

6.6

Comfort

7.1

Crew

8.0

Reviews

1 / 20
6.0
Good

David,Oct 2025

DUB - IAD

Two issues... 1. The Aer Lingus check-in counter in Lisbon did not open until 90 minutes prior to the flight. Huge line of customers waiting to check-in and very time consuming. Plus, having to clear security, passport control, and take the shuttle bus to the plane takes a long time. Consequently, the flight was delayed due to passengers not being able to get to the gate on time. I showed up four hours early but had to wait for over two hours just for the check-in counter to open. Many passengers complaining about the same issue. VERY STRESSFUL! 2. During the flight from Dublin to Washington (Flight EI 119 on October 25, 2025) one of the flight attendants (Glen) was quite rude to a parent of a non-verbal autistic child. At one point I heard him say in a nasty tone, "You have three seconds to put your bag under the seat or I will take it and check it. 3, 2, 1!" I did not speak to the flight attendant because I was afraid he would kick me off the flight. Very unpleasant to everyone before take off also while instructing them to put the seats up and bags under. Beyond being firm and actually nasty and rude. A little interpersonal communication training could help this man.

Related info for your journey

Find useful and relevant information for your journey from Dublin to Portsmouth. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Dublin to Portsmouth?

    For a flight from Dublin to Portsmouth, you will be flying from Dublin. Dublin (DUB) is just 5.7 mi from the center of the city. Dublin is the only Dublin airport and it handles 6 outbound flights to Portsmouth per day. 3 airlines have flights to Portsmouth from Dublin on a regular basis.

  • How long is the flight from Dublin to Portsmouth?

    There are many flights that can get you from Dublin to Portsmouth in 1h 45m. Fly via Aer Lingus to get the fastest option. The distance between Dublin and Portsmouth is about 268 mi. All flights are typically direct.

  • What are the most reliable airlines from Dublin 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 Dublin to Portsmouth on time: Air Canada (72%), Qatar Airways (70%), British Airways (69%).

  • What are the cheapest flights from Dublin to Portsmouth?

    Looking for the cheapest flight from Dublin to Portsmouth? While on average our users pay £1,315, our data indicates the cheapest price to be £47. The most popular route (Dublin - Southampton Eastleigh), is priced around £82.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Dublin 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 Dublin to Portsmouth?

    Currently, February is the cheapest month in which you can book a flight from Dublin to Portsmouth (average of £26). Flying from Dublin to Portsmouth in December is currently the most expensive (average of £37). 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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Top 3 airlines flying from Dublin to Portsmouth

Discover the top 3 airlines that operate flights from Dublin 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 14 November 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£28Average£72FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
British AirwaysCheapest£74Average£138FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£82Average£148FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

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How does Cheapflights help users find flights from Dublin to Portsmouth?

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