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Cheap flights from Portsmouth to Belfast from £37

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BHD
1 Sep — 8 Sep1
1 adult

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

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 27 August 2025.

Round-trip from

£54

One-way from

£37

Popular in

July

Cheapest in

January

Average price

£117
easyJet
  • easyJet
  • 9/10-11/10
  • Nonstop
  • 2h 35m total
  • Portsmouth to Belfast
Search Deals
Aer Lingus
  • Aer Lingus
  • 9/9
  • Nonstop
  • 1h 35m total
  • Portsmouth to Belfast
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£17 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Portsmouth to Belfast

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 27 August 2025.

Thu 9/1015:05SOU - BFS
Nonstop1h 20measyJet
Sat 11/1013:35BFS - SOU
Nonstop1h 15measyJet
Deal found 26/8£54
Sun 7/908:50SOU - BFS
Nonstop1h 20measyJet
Mon 8/910:05BFS - SOU
Nonstop1h 15measyJet
Deal found 26/8£62
Thu 25/915:05SOU - BFS
Nonstop1h 20measyJet
Thu 2/1013:05BFS - SOU
Nonstop1h 15measyJet
Deal found 26/8£63
Thu 9/1015:05SOU - BFS
Nonstop1h 20measyJet
Mon 13/1010:05BFS - SOU
Nonstop1h 15measyJet
Deal found 26/8£79
Fri 3/1012:15SOU - BFS
Nonstop1h 20measyJet
Sun 5/1010:10BFS - SOU
Nonstop1h 15measyJet
Deal found 25/8£82
Wed 5/1108:55SOU - BHD
Nonstop1h 40mAer Lingus
Thu 6/1116:55BHD - SOU
Nonstop1h 35mAer Lingus
Deal found 26/8£87
Mon 22/913:10SOU - BHD
Nonstop1h 35mAer Lingus
Wed 24/906:40BHD - SOU
Nonstop1h 45mAer Lingus
Deal found 25/8£91
Fri 12/912:15SOU - BFS
Nonstop1h 20measyJet
Mon 15/910:05BFS - SOU
Nonstop1h 15measyJet
Deal found 27/8£91
Mon 8/915:45SOU - BHD
Nonstop1h 35mAer Lingus
Tue 9/906:40BHD - SOU
Nonstop1h 45mAer Lingus
Deal found 26/8£91
Fri 3/1012:15SOU - BFS
Nonstop1h 20measyJet
Thu 9/1013:05BFS - SOU
Nonstop1h 15measyJet
Deal found 25/8£94
Sun 7/908:55SOU - BHD
Nonstop1h 35mAer Lingus
Mon 8/911:00BHD - SOU
Nonstop1h 40mAer Lingus
Deal found 26/8£96
Fri 3/1012:15SOU - BFS
Nonstop1h 20measyJet
Fri 10/1010:30BFS - SOU
Nonstop1h 15measyJet
Deal found 25/8£101

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 27 August 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

Thu 9/10

15:05-16:25

Nonstop1h 20m

Belfast Intl

Sat 11/10

13:35-14:50

Nonstop1h 15m

£54

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Sun 7/9

08:50-10:10

Nonstop1h 20m

Belfast Intl

Mon 8/9

10:05-11:20

Nonstop1h 15m

£62

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 25/9

15:05-16:25

Nonstop1h 20m

Belfast Intl

Thu 2/10

13:05-14:20

Nonstop1h 15m

£63

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 9/10

15:05-16:25

Nonstop1h 20m

Belfast Intl

Mon 13/10

10:05-11:20

Nonstop1h 15m

£79

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 3/10

12:15-13:35

Nonstop1h 20m

Belfast Intl

Sun 5/10

10:10-11:25

Nonstop1h 15m

£82

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Wed 5/11

08:55-10:35

Nonstop1h 40m

Belfast City

Thu 6/11

16:55-18:30

Nonstop1h 35m

£87

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 25/9

08:55-10:30

Nonstop1h 35m

Belfast City

Thu 2/10

06:40-08:25

Nonstop1h 45m

£91

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Mon 22/9

13:10-14:45

Nonstop1h 35m

Belfast City

Wed 24/9

06:40-08:25

Nonstop1h 45m

£91

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sat 15/11

15:45-17:20

Nonstop1h 35m

Belfast City

Mon 17/11

06:40-08:25

Nonstop1h 45m

£91

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 25/9

08:55-10:30

Nonstop1h 35m

Belfast City

Thu 25/9

13:40-15:15

Nonstop1h 35m

£91

Flights are sorted by cheapest return flights first.

Deals found on 26/8

Showing 1-10 of 40 results
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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 22 August 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 £67). Flying from Portsmouth to Belfast in July is currently the most expensive (average of £90). 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 27 August 2025.

When flying from Portsmouth to Belfast, 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 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 Sunday afternoons when fares are most often at their lowest. Tuesday evenings 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 27 August 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
1,238 reviews
Check prices

Comfort

7.1

Crew

8.0

Entertainment

6.9

Boarding

7.3

Overall

7.2

Food

6.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

LHR - DUB

The lack of headphones impacted our ability to enjoy the entertainment system provided. The fact that my last connection was associated with an "affiliated airline" that did not allow me to retrieve a check in or a boarding pass via the app almost posed a significant issue as the last leg of the flight was overbooked and we were stressed about getting a seat as a result.
Aer Lingus
7.2
Good
1,238 reviews
Aer Lingus
7.2
Good
1,238 reviews
Check prices

Comfort

7.1

Crew

8.0

Entertainment

6.9

Boarding

7.3

Overall

7.2

Food

6.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

LHR - DUB

The lack of headphones impacted our ability to enjoy the entertainment system provided. The fact that my last connection was associated with an "affiliated airline" that did not allow me to retrieve a check in or a boarding pass via the app almost posed a significant issue as the last leg of the flight was overbooked and we were stressed about getting a seat as a result.
easyJet
6.9
Okay
1,817 reviews
Aer Lingus
7.2
Good
1,238 reviews
Check prices

Comfort

7.1

Crew

8.0

Entertainment

6.9

Boarding

7.3

Overall

7.2

Food

6.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

LHR - DUB

The lack of headphones impacted our ability to enjoy the entertainment system provided. The fact that my last connection was associated with an "affiliated airline" that did not allow me to retrieve a check in or a boarding pass via the app almost posed a significant issue as the last leg of the flight was overbooked and we were stressed about getting a seat as a result.

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 20m. Your travel time will be generally consistent. There are 326 mi between Portsmouth and Belfast. All flights are typically direct.

  • 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 £67). Flying from Portsmouth to Belfast in July is currently the most expensive (average of £90). 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 Portsmouth to Belfast

See prices for flight routes from nearby airports that may be better suited for you.
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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 27 August 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£29Average£58FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£29Average£76FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£43Average£74FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£61Average£105FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£78Average£172FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£129Average£180FlexibilityNo cancel feeOn-time79%
Search Loganair flights

Fly with Cheapflights

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

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

Cheapflights helps you find that perfect flight to Belfast from Portsmouth by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

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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