Bangkok, Krabi, Ko Phi Phi and Phuket: what order?

The cheapest sensible order is Bangkok → Krabi → Ko Phi Phi → Phuket — €54 of transport and 0.6 days spent moving.

Bangkok → Krabi → Ko Phi Phi → Phuket

• Bangkok → Krabi Flight 1h 25m €31
• Krabi → Ko Phi Phi Ferry 1h 30m €11
• Ko Phi Phi → Phuket Ferry 1h €12

You fly into BKK and home from HKT — an open-jaw ticket, usually cheaper than doubling back.