Swansea and Hull fined after fracas
Both clubs had admitted a charge of failing to ensure players conducted themselves in an orderly fashion.
The incident occurred in the 80th minute of the match at the Liberty Stadium on December 9.
The game ended in a 1-1 draw after Danny Graham's opener against his former club was cancelled out by Flores in the 60th minute.
Sagbo and Williams were both booked after the incident, while Swansea midfielder Jonjo Shelvey was also shown a yellow card in the aftermath.
It was the first Premier League match between the two sides.