Without the dimensions & weight of your crate, it´s really hard to say, if the price mentioned is okay or not.
But just for reference, I payed around 600 euros total to airlift a DL650 from Chennai to Bangkok 3 years ago. I dont have the exact figures right here, but I would think that the package was about 2,5 cubic meters, and ~300kg. That was a direct flight time of around 3,5 hours (but it went with Malaysia Airlines, so changed plane in Kuala Lumpur).
Btw, you sure that you wont´t need an agent to do the paperwork & clear the customs? That side of things did seem a bit complicated, and I probably couldn´t have done it all by myself (or would´ve spent a couple weeks more in Chennai, I think!!)
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