Flights: Air Asia and Thai Airways regularly offer promotional prices for flights between Bangkok and Krabi (usually for weekdays flights). Go and visit their website (www.airasia.com) to find good deals.
Bangkok Airways has regular flights between Samui and Krabi (www.bangkokair.com)
Tiger Airways also has flights from Singapore to Krabi. There are now 4 flights per week. Visit www.tigerairways.com