Composed by Nicholas Hooper, this theme appears as the Order spirits Harry Potter away from 4 Privet Drive to its headquarters, 12 Grimmauld Place. It is later heard during the closing credits of the film.
"Flight of the Order of the Phoenix" is a lively theme that begins with a slow build on snare drums and strings, joined by faster strings and brass in a rising theme that includes a bit of the motif of "Dumbledore's Army," before coming to a triumphant conclusion.
It appears as Track 17 on the original motion picture soundtrack of Harry Potter and the Order of the Phoenix, making it very much out of sequence from where the theme appears within the main film itself.
In LEGO Harry Potter: Years 5-7, a brief snippet of this tune is played each time the player clears a level as a sort of victory theme.