Cab 3 hours and Rs 10,000-11,000 from the taxi desks. Bus-train 5-6 hours as these cannot use the E-way. Reliability soso but in the end they'll get you there. Hybrid compromise could be cab 1 hour to Kadawatha bus stand, Rs 2500, then EX01 bus to Galle (1.45 hours) and then tuktuk or cab to U'tuna.
<Erik> & [Sandya]
We used an app called PickMe which works like Uber. Our driver picked us up from the airport and took us straight to our accommodation in Hikkaduwa. (It took about 2 hours and cost us £28) It wasn’t as ‘authentic’ as the bus or train but great if you arrive at 4am :)
Trains and busses are reliable but it really depends what time you land... and if you are up for negotiating public transport after a long flight. As the poster below states pick me (and kangaroo cabs) are both good transfer options to get to your hotel quickly. They both have apps you can download from abroad.