I need to send and receive EMS parcels within Thailand. I know the price is based on weight, but is it also based on distance as well? e.g. would a 100g parcel cost the same using EMS if I sent BKK->BKK vs BKK->Chiang Mai?

Distance is not part of the calculation, only weight. Here is the rate calculator - http://www.thailandpost.com/rate.php

//edit - Appears my error as I was basing on envelops but parcels have an in area and out area charge. http://www.thailandpost.com/rate-result.php

Thanks - it would be (padded) envelopes rather than parcels anyway, so I don't think the in area and out area would apply.

Superspeed is only available from certain loactions. Main offices, etc.

Edited April 6, 201511 yr by wimpy

It's been a while since I posted anything, but from memory I think there's also the option for standard mail but with a registered post addition for 35 baht on top of normal post prices. That might save a little if price is a consideration.

I also found that the website price and the in post office price don't always agree. They usually have a card or faxed price list which is up to date, and they will say to ignore the website price. Sometimes I get the feeling that their scales could do with calibrating as well. The map is not always the territory when it comes to post office adventures.