their avoid delays website it simply avoiddelays.com
For example they suggest that if you are flying out of SFO you should
select flights that depart before 0930 if you leaving SFO in the morning.
If you are flying in the afternoon they suggest you select a flight with
a departure between 1400-1700 (2 pm and 5 pm). Using Southwest’s upcoming launch of 18 departures, Southwest has 4 of 8 to San Diego
that follow the above suggestions, 3 of 7 to Las Vegas, and 2 of 3 to Midway.