From New Paltz, NY bus to 42 St - Port Authority Bus Terminal, subway to Roosevelt Av/74 St, then bus to Lga/Terminal B. 2 h 8 min $30. From New Paltz drive to New York La Guardia Airport (LGA). 1 h 36 min $10. From New Paltz towncar to New York La Guardia Airport. 1 h 36 min $85.