Spirit Airlines Sale ends 6-7-13. You can get a a flight for as low as $29.90 one way. Laguardia to Myrtle Beach is $83.89 one way.Travel Dates: Mondays, Tuesdays, Wednesdays, Thursdays, Fridays and Saturdays from August 19, 2013 thru November 21, 2013 AND December 4, 2013 thru December 18, 2013. You can view Spirit’s baggage fee rules here.