The Florida flag has a saltire, which by coincidence is similar to the Saint Andrew's cross; there is no direct connection with the saint.
The Saltire was part of the design of the flag of the Spanish Empire which controlled Florida when it was first "discovered" by European explorers.
st Andrews cross
The Flag of Scotland is a white saltire, a crux decussate (X-shaped cross) representing the cross of the Christian martyr Saint Andrew, the patron saint of Scotland, on a blue field.
The St Georges Cross, which is a red addition cross on a white background, If you mean the Union Flag of the United Kingdom, it is a combination of the St Georges Cross of England, the St Andrews Cross of Scotland and the flag of Northern Ireland.
St Andrews Cross (Scottish flag), St George's Cross (English flag) and St Patrick's Cross ((Northern) Irish flag)
Scotland has two flags and one of them has two names. The best known is the flag with a blue background and a white multiplication cross. This flag is known as both the St Andrews Cross and the Saltire. The other flag depicts a lion standing on its hind legs and is known as the Lion Rampant.
The Saltire and the St. Andrew's Cross are two names for the flag of Scotland. It features a white diagonal cross on a blue field.
The Union Flag is composed of the flags of England (St Georges Cross), Scotland (St Andrews Cross) and Northern Ireland (St Patricks Cross).
The flag of the UK comprises the flags of: Scotland (white St. Andrew's cross on blue), England (red St. George's cross on white), Ireland (St. Patrick's cross).
The Union Flag is an amalgamation of a St. Georges Cross representing England, a St. Andrews Cross representing Scotland and a St. Patricks Cross representing Ireland. Wales isn't represented on the Union Flag.
The cross of St. George.
Scotland has two flags. The most common is the St Andrews Cross (a blue multiplication cross on a white background), sometimes known as the Saltire. The other flag is the Lion Rampant.
The St Andrews Cross (otherwise known as the Saltire), like any other national flag can be flown at any time but specially on official occasions.