http://tinypic.com/r/10dgncw/6
http://tinypic.com/r/2h4c4fk/6
This is one of the more quantifiable high-end speed feats in comics. You know about how great the distance is (just over 1 light year) and the equivalent of a starting gun courtesy of warlock.
Using deliberately low-ball estimates of Thanos' punching speed (trying only to put him around peak-human) and a generous assumption that his punch was already 25% completed before he was interrupted, I figured that Surfer was averaging over 40 billion x the speed of light--traveling over one light year in under a thousandth of a second.
Not bad from a standing start.