One issue, as nsx states, is the POSTED delay is usually not correct. Very often I have seen the incoming flight as being On Time when the flight still has not left the other airport and it is 45 min. late already.
If you see 20 min delay, 90% of the time expect 45 min or more!
I think you have a good chance if there is space and you have a short connection at the airport you are flying to.
One of my biggest complaints with WN: They do not give out accurate info as to delays, departures from other airports, etc.