Cheap flights from Southampton to Northern Ireland from £38

In general, September is the cheapest month to fly from Southampton to Northern Ireland. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £88. If you’re not able to fly to Northern Ireland in September, then May is your next best option. Flight prices from Southampton to Northern Ireland during May average around £110.

The cheapest day to depart from Southampton to Northern Ireland is on a Thursday. Travellers who choose to depart for Northern Ireland on a Thursday will often find tickets for as low as £71. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around £120. These prices are subject to change though, so be sure to set up a Price Alert for flights to Northern Ireland.

Flying to Northern Ireland from Southampton in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as £121 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are £138 on average. Flights to Northern Ireland from Southampton in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Southampton Eastleigh to Belfast Intl for the best Southampton Eastleigh - Northern Ireland flight prices

You are more likely to see cheaper flights to Northern Ireland from Southampton when booking weeks ahead of your departure date. In general, you can expect to find flights to Northern Ireland for around £120 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Northern Ireland from Southampton for as low as £75 on momondo.

There is only 1 cabin class available to choose from on Southampton to Northern Ireland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Aer Lingus, easyJet, and KLM are the most popular carriers operating from Southampton Eastleigh to Northern Ireland

easyJet, British Airways and Aer Lingus are the top three most popular airlines that fly to Northern Ireland from Southampton according to our data. easyJet is the first choice among our users, with 52% of people opting to fly with this airline when travelling to Northern Ireland. Keep in mind that there are 5 different airlines that fly to Northern Ireland on a routine basis, so you have a few additional options to choose from.

5 flights are operational daily from Southampton to Northern Ireland as of October 2026. The most popular departure time for this route is 12:00, with 38% of flights per day taking off in the afternoon.

The number of flights available between Southampton and Northern Ireland is 40 per week as of October 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.