The Flash #117 DC Comics (1987)

The Flash must once again risk contact with the Speed Force in order to return to his home time and save Keystone City from another ice age.

Flash's "Race Against Time" concludes! Can Wally make it back from the future through the Speed Force in time to save Linda and all of Keystone City from another ice age? And what, at last, has John Fox been up to all this time