No. 1 Salt Lake City International Airport (SLC)
Flights Delayed: 9.22%
The champ from 2008 and 2009 has come back to reclaim its crown of punctuality: the airport improved its performance by six percentage points from last year and continues to seemingly laugh in the face of snowstorms. Just watch out for that 6 p.m. rush hour.
Best Time Window: Before 10 a.m.
Worst Time Window: 6–7 p.m.