Like all other Sussex clubs they didn't play any games during the First World War, and part of their pitch was dug up to grow food.

[1] After the Second World War, they were among the founding members of the Sussex County League Division Two in 1952.

The club left the County League in 1978 but rejoined as of the founder members of the new Division Three in 1983.

[3] Seaford were promoted to Division Two in 2000–01 where they have been ever since, with 6th being their best finish achieved in 2004–05 and 2006–07 (adopting the "Town" suffix once more in 2005).

The club have only competed in the FA Vase on two occasions – a Preliminary Round defeat at the hands of Cowes Sports in 1975–76, but after the erection of the floodlights, became eligible for the national competition from the 2008–09 season and were subsequently knocked out by Chichester City United in the preliminary round that season.