"God Speed" ...where did this phrase originate?

It's an abbreviation of "god speed you on your journey", the traditional farewell from 'way back when travel was extremely difficult and dangerous and there was a very real possibility that you might never return.

It's "Godspeed" and it's a word from early English meaning "may God prosper you." The word Godspeed is used to wish a person good fortune or success, as on starting a journey, a new business, etc. It is usually found in expressions of the sort "to bid (a person) Godspeed."

A few examples: "Evangelist, after he had kissed him, gave him one smile, and bid him God-speed. So he went on with haste..." (John Bunyan, Pilgrim's Progress); "'I'm wishing you God-speed, Hattersley,' cried Arthur, 'and aiding you with my prayers'" (Anne Brontë Tenant of Wildfell Hall); "Rowland at the garden gate was giving his hostess Godspeed on her way to church" (Henry James, Roderick Hudson); "Eight years before he had seen his friend off at the North Wall and wished him God-speed" (James Joyce, Dubliners).

Godspeed is a nominalization of the phrase God speed (you), understanding which depends on two things: speed in this sense means 'to prosper; succeed', which is now archaic, but which is the original sense of the word; and the verb is subjunctive, expressing a wish, with the entire phrase meaning "may God cause you to succeed."

The word Godspeed (which can also be written God-speed) is from Middle English, first found in personal names in the thirteenth century.

The word Godspeed is used to wish a person good fortune or success, as on starting a journey, a new business, etc. It is usually found in expressions of the sort "to bid (a person) Godspeed."

A few examples: "Evangelist, after he had kissed him, gave him one smile, and bid him God-speed. So he went on with haste..." (John Bunyan, Pilgrim's Progress); "'I'm wishing you God-speed, Hattersley,' cried Arthur, 'and aiding you with my prayers'" (Anne Brontë Tenant of Wildfell Hall); "Rowland at the garden gate was giving his hostess Godspeed on her way to church" (Henry James, Roderick Hudson); "Eight years before he had seen his friend off at the North Wall and wished him God-speed" (James Joyce, Dubliners).

Godspeed is a nominalization of the phrase God speed (you), understanding which depends on two things: speed in this sense means 'to prosper; succeed', which is now archaic, but which is the original sense of the word; and the verb is subjunctive, expressing a wish, with the entire phrase meaning "may God cause you to succeed." Semantic parallels are such common expressions as God bless you or God forbid!; another nominalization is goddamn (as in "I don't give a good goddamn what you think"), shortened from God damn you.

The word Godspeed (which can also be written God-speed) is from Middle English, first found in personal names in the thirteenth century.

Actually as in the DaVinci code we have learned that the separation is in the wrong place...

This expression originally came after a rain storm, when some poor ignoramus said, "Gods Peed" and it stuck

it came from the first space ship they told them come home safe god speed

it was in spiderman the movie-but i don't know where it came from.