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Cheap flights from Portsmouth to Belfast from £86

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BHD
30 Nov — 7 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Portsmouth to Belfast are usually found in January or February, booked 83 days in advance, depart on a Tuesday or Saturday and return on a Saturday

Find flight deals from Portsmouth to Belfast

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Belfast
Explore the most affordable flight options available from Portsmouth to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 October 2025.

Thu 4/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Sun 7/1210:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 30/10£138
Fri 12/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Sun 14/1210:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 29/10£144
Sat 6/1215:45SOU - BHD
Nonstop1h 35mAer Lingus
Sun 7/1210:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 30/10£149
Thu 4/1219:00SOU - BHD
Nonstop1h 35mMultiple Airlines
Sun 7/1210:50BHD - SOU
2 stops21h 55mMultiple Airlines
Deal found 30/10£172
Wed 5/1108:55SOU - BHD
Nonstop1h 40mMultiple Airlines
Sun 9/1108:40BHD - SOU
2 stops34h 40mMultiple Airlines
Deal found 30/10£179
Sun 9/1112:20SOU - BHD
Nonstop1h 35mAer Lingus
Sun 16/1110:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 30/10£199
Mon 29/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Fri 2/110:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 29/10£201
Sat 8/1109:30SOU - BFS
1 stop5h 40mMultiple Airlines
Sat 15/1112:45BFS - SOU
2 stops20h 00mMultiple Airlines
Deal found 29/10£213
Sun 9/1118:25SOU - BHD
1 stop13h 05mMultiple Airlines
Sun 16/1110:10BHD - SOU
Nonstop1h 40mMultiple Airlines
Deal found 30/10£222
Sat 6/1209:25SOU - BHD
1 stop11h 35mKLM
Sun 7/1206:30BHD - SOU
1 stop25h 40mKLM
Deal found 30/10£223
Wed 12/1116:05SOU - BFS
2 stops17h 15mMultiple Airlines
Thu 13/1119:45BFS - SOU
2 stops23h 35mMultiple Airlines
Deal found 30/10£225
Sat 6/1209:30SOU - BFS
1 stop12h 30mMultiple Airlines
Sun 7/1207:30BFS - SOU
2 stops25h 15mMultiple Airlines
Deal found 30/10£226

Cheap flight deals from Portsmouth to Belfast

Keep the following information in mind while searching for Portsmouth to Belfast flight deals. Data was last updated 31 October 2025.

Round-trip from

£86

Popular in

July

Cheapest in

January

Average price

£92
easyJet
  • easyJet
  • 16/1-18/1
  • 2 total stops
  • 27h 20m total
  • Portsmouth to Belfast
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£17 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Belfast 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 31 October 2025.
Use the filters below to find and compare flights from Portsmouth to Belfast that are best for you.

Fly from

Portsmouth

Fly to

Belfast

Route

Depart

Return

Price

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 16/1

17:45-07:25

1 stop13h 40m

Belfast Intl

Sun 18/1

21:45-11:25

1 stop13h 40m

£86

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 9/1

17:45-07:25

1 stop13h 40m

Belfast Intl

Sun 11/1

21:45-11:25

1 stop13h 40m

£99

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 4/12

19:00-20:35

Nonstop1h 35m

Belfast City

Mon 8/12

10:10-11:50

Nonstop1h 40m

£112

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Fri 9/1

19:00-20:35

Nonstop1h 35m

Belfast City

Sun 11/1

14:15-14:00

2 stops23h 45m

£124

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sat 10/1

08:55-10:35

Nonstop1h 40m

Belfast City

Mon 12/1

08:20-11:25

1 stop3h 05m

£134

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 4/12

19:00-20:35

Nonstop1h 35m

Belfast City

Sun 7/12

10:10-11:50

Nonstop1h 40m

£138

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Fri 16/1

19:00-20:35

Nonstop1h 35m

Belfast City

Sun 18/1

08:20-17:45

1 stop9h 25m

£145

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 16/1

08:10-08:25

2 stops24h 15m

Belfast Intl

Sun 18/1

21:45-11:25

1 stop13h 40m

£146

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 4/12

19:00-20:35

Nonstop1h 35m

Belfast City

Mon 8/12

16:55-08:50

2 stops15h 55m

£146

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Fri 12/12

19:00-20:35

Nonstop1h 35m

Belfast City

Sun 14/12

10:10-11:50

Nonstop1h 40m

£151

Flights are sorted by cheapest return flights first.

Deals found on 30/10

Showing 1-10 of 15 results
1
2

Best time to book a flight from Portsmouth to Belfast

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

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

Use this chart to determine the optimal time to book a return flight from Portsmouth to Belfast. Price data was last updated on 24 October 2025.

To ensure you get the cheapest price possible for a flight from Portsmouth to Belfast, you should look to book at least 83 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, January is the cheapest month in which you can book a flight from Portsmouth to Belfast (average of £14). Flying from Portsmouth to Belfast in August is currently the most expensive (average of £40). 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 P0R to BFS?

Find hourly flight availability from Portsmouth to Belfast. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 31 October 2025.

One of the essential ways to save on airfare from Portsmouth to Belfast is to remain as flexible as possible. Flights that are at midday tend to be the most expensive. A flight in the afternoon could potentially save you up to 27% on airfare.

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

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

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

Reviews of airlines servicing Belfast

Get insights into the airlines that provide service to Belfast. 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 Belfast. Reviews last updated 31 October 2025.
See what other customers who have flown with Aer Lingus and easyJet from Portsmouth to Belfast 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
1,365 reviews
Check prices

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Boarding

7.4

Food

6.6

Reviews

1 / 20
6.0
Good

David,Oct 2025

LIS - DUB

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 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. A little interpersonal communication training could help this man. Other than those two issues, the flight was fine.
Aer Lingus
7.2
Good
1,365 reviews
Aer Lingus
7.2
Good
1,365 reviews
Check prices

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Boarding

7.4

Food

6.6

Reviews

1 / 20
6.0
Good

David,Oct 2025

LIS - DUB

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 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. A little interpersonal communication training could help this man. Other than those two issues, the flight was fine.
easyJet
6.9
Okay
1,840 reviews
Aer Lingus
7.2
Good
1,365 reviews
Check prices

Comfort

7.1

Entertainment

6.9

Crew

8.0

Overall

7.2

Boarding

7.4

Food

6.6

Reviews

1 / 20
6.0
Good

David,Oct 2025

LIS - DUB

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 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. A little interpersonal communication training could help this man. Other than those two issues, the flight was fine.

Related info for your journey

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

    easyJet and Aer Lingus can get you from Portsmouth to Belfast in just under 1h 35m. Your travel time can differ by up to 12h 05m. There are 316 mi between Portsmouth and Belfast. This flight may include one or multiple stops.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Portsmouth to Belfast (average of £14). Flying from Portsmouth to Belfast in August is currently the most expensive (average of £40). 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 6 airlines flying from Portsmouth to Belfast

Discover the top 6 airlines that operate flights from Portsmouth to Belfast. 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 31 October 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£29Average£61FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£30Average£83FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£41Average£75FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£64Average£111FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£78Average£144FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£132Average£181FlexibilityNo cancel feeOn-time79%
Search Loganair flights

Fly with Cheapflights

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Portsmouth to Belfast flexibly with Cheapflights today.

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