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Cheap flights from Southampton to Belfast Intl Airport from £71

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 15/12. Fares are subject to change and may not be available on all flights or dates of travel.
SOU — BFS
18 Dec — 25 Dec1
1 adult
1 adult, Economy, 0 bags

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

Cheap flight deals from Southampton to Belfast Intl

Discover tips and strategies to find the most affordable flight options for your journey from Southampton (SOU) to Belfast Intl (BFS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 18 November 2025.

Round-trip from

£87

One-way from

£71

Popular in

July

Cheapest in

January

Average price

£130

Good round-trip deal

£73 or less

Good one-way deal

£54 or less
easyJet
  • easyJet
  • 1/1-8/1
  • 2 total stops
  • 29h 25m total
  • Southampton to Belfast
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easyJet
  • easyJet
  • 15/12
  • 1 total stop
  • 19h 50m total
  • Southampton to Belfast
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (£16 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£3 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Southampton Eastleigh to Belfast Intl.
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Price to beat on a one-way flight from Southampton Eastleigh to Belfast Intl.
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Find flight deals from Southampton to Belfast Intl

Enter your travel dates to find the best prices.

Cheapest flights from Southampton to Belfast Intl
Explore the most affordable flight options available from Southampton to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 November 2025.

Mon 15/1208:30SOU - BFS
2 stops24h 35mMultiple Airlines
Mon 22/1207:50BFS - SOU
1 stop11h 30mMultiple Airlines
Deal found 17/11£175
Wed 31/1216:05SOU - BFS
2 stops16h 20mMultiple Airlines
Wed 7/119:15BFS - SOU
2 stops22h 05mMultiple Airlines
Deal found 16/11£182
Thu 18/1217:55SOU - BFS
1 stop17h 20measyJet
Mon 22/1208:15BFS - SOU
1 stop3h 10measyJet
Deal found 16/11£190
Sat 13/1213:55SOU - BFS
2 stops18h 30mMultiple Airlines
Sun 14/1222:45BFS - SOU
2 stops15h 15mMultiple Airlines
Deal found 17/11£192
Thu 18/1220:10SOU - BFS
2 stops15h 10mMultiple Airlines
Mon 22/1207:50BFS - SOU
1 stop11h 30mMultiple Airlines
Deal found 16/11£201
Mon 15/1212:05SOU - BFS
1 stop8h 15measyJet
Tue 30/1208:35BFS - SOU
1 stop24h 15measyJet
Deal found 17/11£204
Sun 14/1218:20SOU - BFS
2 stops15h 25mMultiple Airlines
Sun 21/1207:10BFS - SOU
2 stops25h 35mMultiple Airlines
Deal found 16/11£209

Cheapflights Fare Finder

 
Customise your flight search to find flights from Southampton to Belfast Intl 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 18 November 2025.
Use the filters below to find and compare flights from Southampton to Belfast Intl Airport that are best for you.

Fly from

Southampton

Fly to

Belfast Intl

Route

Depart

Return

Price

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 1/1

17:55-19:35

1 stop25h 40m

Belfast Intl

Thu 8/1

13:35-17:20

1 stop3h 45m

£87

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Mon 12/1

12:05-20:20

1 stop8h 15m

Belfast Intl

Sun 18/1

21:45-11:25

1 stop13h 40m

£90

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 3/4

12:20-13:35

Nonstop1h 15m

Belfast Intl

Sun 5/4

10:50-12:05

Nonstop1h 15m

£91

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

£93

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 30/4

15:05-16:25

Nonstop1h 20m

Belfast Intl

Sun 3/5

08:35-17:50

1 stop9h 15m

£95

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 2/1

17:45-07:25

1 stop13h 40m

Belfast Intl

Sun 4/1

22:05-19:40

2 stops21h 35m

£150

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 2/1

17:45-07:25

1 stop13h 40m

Belfast Intl

Sun 4/1

21:45-11:25

1 stop13h 40m

£152

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 16/1

08:10-08:00

2 stops23h 50m

Belfast Intl

Sun 18/1

21:45-11:25

1 stop13h 40m

£153

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 1/1

17:55-08:15

2 stops14h 20m

Belfast Intl

Thu 8/1

18:35-13:45

2 stops19h 10m

£169

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Mon 15/12

12:05-07:55

1 stop19h 50m

£71

Flights are sorted by cheapest return flights first.

Deals found on 17/11

Showing 1-10 of 12 results
1
2

Best time to book a flight from Southampton to Belfast Intl

Have a flexible travel schedule? Discover the best time to fly to Belfast Intl from Southampton 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 Southampton to Belfast Intl Airport

How far ahead should I book a flight from Southampton to Belfast Intl Airport?

Use this chart to determine the optimal time to book a return flight from Southampton to Belfast Intl. Price data was last updated on 14 November 2025.

Booking 83 days in advance of your planned departure date is, on average, the best time to get cheap flights from Southampton to Belfast Intl Airport. 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 Southampton to Belfast Intl Airport?

Currently, January is the cheapest month in which you can book a flight from Southampton to Belfast Intl Airport (average of £14). Flying from Southampton to Belfast Intl Airport 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 SOU to BFS?

Find hourly flight availability from Southampton to Belfast Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 November 2025.

One of the essential ways to save on airfare from Southampton to Belfast Intl Airport is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at midday could potentially save you up to 23% on airfare.

Reviews of airlines servicing Belfast Intl

Get insights into the airlines that provide service to Belfast Intl. 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 Intl. Reviews last updated 18 November 2025.
Read through reviews of airlines operating flights from Southampton to Belfast Intl Airport, such as Aer Lingus and easyJet. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,371 reviews
Check prices

Entertainment

6.9

Boarding

7.4

Comfort

7.1

Food

6.6

Crew

8.0

Overall

7.2

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
1,371 reviews
Aer Lingus
7.2
Good
1,371 reviews
Check prices

Entertainment

6.9

Boarding

7.4

Comfort

7.1

Food

6.6

Crew

8.0

Overall

7.2

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.
easyJet
6.9
Okay
1,844 reviews
Aer Lingus
7.2
Good
1,371 reviews
Check prices

Entertainment

6.9

Boarding

7.4

Comfort

7.1

Food

6.6

Crew

8.0

Overall

7.2

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 Southampton to Belfast Intl. 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 Southampton to Belfast Intl?

    If you book a flight to Belfast Intl from Southampton, you will be flying from Eastleigh, which is the city’s only airport. Southampton Eastleigh (SOU) is located 3.5 mi from the center of Southampton. There are 0 flights from Eastleigh to Belfast Intl per day from 2 different airlines.

  • How long is the flight from Southampton to Belfast Intl Airport?

    There are many flights that can get you from Southampton to Belfast Intl Airport in 25h 40m. Fly via easyJet to get the fastest option. The distance between Southampton and Belfast Intl Airport is about 326 mi.

  • What are the cheapest airlines flying from Southampton to Belfast Intl Airport round-trip?

    Cheapflights users have booked flights from Southampton to Belfast Intl Airport round-trip from £36. Another airline that can offer you cheap pricing is Aer Lingus. easyJet is priced at 63% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest flights from Southampton to Belfast Intl Airport?

    The cheapest flight price from Southampton to Belfast Intl Airport is £25. On average you can expect to pay £102. The most popular route, (Southampton Eastleigh - Belfast Intl), can usually be booked for £91.

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

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

  • How can I find direct flights from Southampton to Belfast Intl?

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

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

    Yes. Cheapflights offers flight deals from Southampton to Belfast Intl 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 Southampton to Belfast Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from Southampton to Belfast Intl Airport (average of £14). Flying from Southampton to Belfast Intl Airport 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

Travelling to a place near Belfast Intl Airport?

Book flights to Belfast Intl Airport if you plan to visit one of these locations
Armagh
Newry
Ballymena
Cookstown
Dungannon

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Alternative routes for Southampton to Belfast Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Southampton to Belfast Intl

Discover the top 2 airlines that operate flights from Southampton to Belfast Intl. 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 18 November 2025.
AirlineCheapestAverageFlexibilityOn-time
easyJetCheapest£36Average£77FlexibilityNo cancel feeOn-time86%
Search easyJet flights
Aer LingusCheapest£64Average£105FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

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How does Cheapflights help users find flights from Southampton to Belfast Intl?

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

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

Need flexible booking options for your flight to Belfast Intl from Southampton? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Southampton to Belfast Intl become cheaper?

Of course! You can now track prices for flights from Southampton to Belfast Intl and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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