Newark (EWR), in terms of delays and congestion; LaGuardia (LGA), in terms of density and poorness; O'Hare (ORD), in terms of its layout that is confusing; Philadelphia (PHL), in terms of lengthy lines; LAX, in terms of its dense traffic; and Denver (DEN), in terms of its isolated location and frequency of delays, are some of the worst airports in the U.S. Traveling in these airports can be quite exasperating and exhausting to the passenger.