I will be traveling within Thailand for a month in March, is it ...

If it was high season (December/January) then perhaps booking early would be better off. For Pattaya you can take a taxi or cheap bus from Bangkok. For Chiang Mai you could even take an overnight sleeper train to get there and save the price of a hotel room. There are some discount airlines that you can get but some of them have some weight allowances to consider or pay penalties. Do you mean Krabi â€" Railay Beach? My preference is Thai Air when possible, just an opinion. ...