Zero traffic, the distance and travel time from Ford Field to each of the three airports in the metro Detroit area are:
Detroit Metro - 21 miles and approx. 30 mins
Detroit Willow Run - 34 miles and approx 40 mins
Oakland Pontiac - 35 miles and approx 40 mins.
From what I've heard, Metro is pretty much booked up now, Willow Run would probably be my next choice because it's a little easier to travel to, just go west on I-94.
Oakland Pontiac is a little harder to get to, North on I-75 to West M-59.
Lots of hotels around Metro, but they are probably booked by now, Willow Run, probably have to go to Ann Arbor to find rooms (not a bad thing, IMHO) and Pontiac; few choices around airport, need to go to Pontiac or towards Flint since anything SE of the airport is probably already sold out.
Expect delays out of any airport other than Metro since all traffic shares the same inbound and outbound fixes as Metro and YIP and PTK will have to share load. Metro is very well equipped to handle a large rush of aircraft (think Northwest hub and up to 4 runways that will be in use for arrivials and departures while Pontiac only has one and Willow Run two) The biggest headache will be getting from the ramp to the runway, or vice-a-versa....at any airport you choose.