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Cheap flights from Portsmouth to Belfast from £42
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 25/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BHD
16 Nov — 23 Nov1
Cheapflights Tip: The best prices from Portsmouth to Belfast are usually found in January or February, booked 87 days in advance, depart on a Tuesday or Saturday and return on a Wednesday
Find flight deals from Portsmouth to Belfast
Cheapest flights from Portsmouth to BelfastExplore 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 17 October 2025.
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 17 October 2025.
Mon 20/1018:35SOU - BFS
Nonstop1h 20measyJet
Thu 23/1013:05BFS - SOU
Nonstop1h 15measyJet
Deal found 15/10£82
Mon 20/1018:35SOU - BFS
Nonstop1h 20measyJet
Tue 21/1023:10BFS - SOU
1 stop9h 20measyJet
Deal found 15/10£89
Sat 8/1115:45SOU - BHD
Nonstop1h 35mAer Lingus
Mon 10/1110:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 15/10£92
Sat 18/1015:20SOU - BFS
Nonstop1h 20measyJet
Mon 20/1016:50BFS - SOU
Nonstop1h 15measyJet
Deal found 15/10£92
Wed 26/1119:00SOU - BHD
Nonstop1h 35mAer Lingus
Wed 3/1206:40BHD - SOU
Nonstop1h 45mAer Lingus
Deal found 15/10£95
Tue 28/1019:00SOU - BHD
Nonstop1h 35mAer Lingus
Mon 10/1116:55BHD - SOU
Nonstop1h 35mAer Lingus
Deal found 16/10£111
Sun 19/1012:00SOU - BFS
Nonstop1h 20measyJet
Mon 20/1016:50BFS - SOU
Nonstop1h 15measyJet
Deal found 16/10£116
Mon 20/1018:35SOU - BFS
Nonstop1h 20measyJet
Mon 20/1022:00BFS - SOU
1 stop13h 45measyJet
Deal found 15/10£118
Sun 19/1012:00SOU - BFS
Nonstop1h 20measyJet
Tue 21/1023:10BFS - SOU
1 stop9h 20measyJet
Deal found 15/10£122
Fri 12/1219:00SOU - BHD
Nonstop1h 35mAer Lingus
Sun 14/1210:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 15/10£128
Fri 28/1119:00SOU - BHD
Nonstop1h 35mAer Lingus
Sun 30/1110:10BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 16/10£133
Mon 20/1015:45SOU - BHD
Nonstop1h 35mAer Lingus
Tue 21/1006:40BHD - SOU
Nonstop1h 45mAer Lingus
Deal found 15/10£138
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 17 October 2025.
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 17 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 - BHD
SOUBHD
Southampton Eastleigh
Sat 8/11
15:45-17:20
Nonstop1h 35m
Belfast City
Mon 10/11
10:10-11:50
Nonstop1h 40m
£92
SouthamptonBelfast
SOU - BHD
SOUBHD
Southampton Eastleigh
Tue 28/10
19:00-20:35
Nonstop1h 35m
Belfast City
Mon 10/11
16:55-18:30
Nonstop1h 35m
£111
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
£128
SouthamptonBelfast
SOU - BFS
SOUBFS
Southampton Eastleigh
Thu 1/1
17:55-19:35
1 stop25h 40m
Belfast Intl
Sun 4/1
21:45-11:25
1 stop13h 40m
£133
SouthamptonBelfast
SOU - BHD
SOUBHD
Southampton Eastleigh
Sat 8/11
08:55-10:35
Nonstop1h 40m
Belfast City
Mon 10/11
08:00-19:20
2 stops11h 20m
£142
SouthamptonBelfast
SOU - BHD
SOUBHD
Southampton Eastleigh
Sat 10/1
15:45-17:20
Nonstop1h 35m
Belfast City
Wed 14/1
16:50-08:45
2 stops15h 55m
£144
SouthamptonBelfast
SOU - BHD
SOUBHD
Southampton Eastleigh
Thu 30/10
08:55-10:35
Nonstop1h 40m
Belfast City
Mon 3/11
13:15-15:35
2 stops26h 20m
£177
SouthamptonBelfast
SOU - BFS
SOUBFS
Southampton Eastleigh
Fri 28/11
19:50-22:00
2 stops26h 10m
Belfast Intl
Sun 30/11
22:45-14:00
2 stops15h 15m
£179
SouthamptonBelfast
SOU - BFS
SOUBFS
Southampton Eastleigh
Fri 21/11
19:50-22:00
2 stops26h 10m
Belfast Intl
Sun 23/11
22:45-19:20
2 stops20h 35m
£179
SouthamptonBelfast
SOU - BFS
SOUBFS
Southampton Eastleigh
Sat 10/1
17:15-06:45
1 stop13h 30m
Belfast Intl
Wed 14/1
07:55-17:20
1 stop9h 25m
£179
Showing 1-10 of 29 results
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 10 October 2025.
To ensure you get the cheapest price possible for a flight from Portsmouth to Belfast, you should look to book at least 87 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 £39). 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 17 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 evening could potentially save you up to 28% 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 17 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.
Comfort
7.1
Crew
8.0
Entertainment
6.9
Boarding
7.4
Food
6.5
Overall
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
LHR - DUB
Comfort
7.1
Crew
8.0
Entertainment
6.9
Boarding
7.4
Food
6.5
Overall
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
LHR - DUB
Comfort
7.1
Crew
8.0
Entertainment
6.9
Boarding
7.4
Food
6.5
Overall
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
LHR - DUB
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.
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Alternative routes for Portsmouth to Belfast
See prices for flight routes from nearby airports that may be better suited for you.
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 17 October 2025.
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Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Belfast?
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