Pardon me if this was a common knowledge.

I found that Air Austral (Airline of French territories of Indian Ocean) flies to Chennai (from Reunion, and extends to BKK).

They are doing twice weekly runs on RUN-MAA-BKK and return.

Now MAA has 3 direct connections to BKK (TG, FD and UU).. Fantastic! Return fares between MAA-BKK are in the range of Rs.17K in Y on Air Austral, which operates a B737-800.

Sadly BLR has only TG, and SG pulled their service as fast as they introduced it.