Cheap flights from Southampton to Belfast from £26

The cheapest month to fly to Belfast from Southampton is in September. Flight prices, which tend to average around £83, are often lower during this time because this is during the off-season. If you aren’t able to travel to Belfast during the month of September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of £88.

The cheapest day to depart on your flight to Belfast is on a Tuesday when prices can be found for as low as £62. This is often the case because there is less demand to fly during this day of the week. Flights from Southampton to Belfast on a Friday will generally be more expensive and average around £81. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

The cheapest time of day to fly to Belfast is in the morning when flights can be purchased for as low as £92. Flights to Belfast are more costly at midday, with an average ticket price of £122. Departure times at midday fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Belfast from Southampton when booking weeks ahead of your departure date. In general, you can expect to find flights to Belfast for around £117 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Belfast from Southampton for as low as £78 on momondo.

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

easyJet and Aer Lingus are the most popular carriers operating from Southampton Eastleigh to Belfast

easyJet, British Airways and Aer Lingus are the top three most popular airlines that fly to Belfast 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 Belfast. Keep in mind that there are 6 different airlines that fly to Belfast on a routine basis, so you have a few additional options to choose from.

As of April 2026, 5 flights take off from Southampton and land in Belfast each day. The most common flight departure time for this route is 12:00, with 39% of daily flights taking off in the afternoon.

As of April 2026, there are 41 flights per week flying from Southampton to Belfast. The most common day of the week flights depart is Fri, with 17% of flights taking off on this day.