SpiceJet is the first off the block with a sale to celebrate Republic Day. They are offering some great value tickets right now for travelling around the country through December 2018. Check out below the details you would need for the SpiceJet Sale.
SpiceJet Sale through January 25, 2018
You can have all-inclusive domestic tickets for INR 769 if you are planning to travel around India. And INR 2469 onwards if you are planning to go abroad. Not just that, if you use an SBI Card to book your tickets, you get a further 10% off on the tickets and free priority check-in using the SpiceMax counter.
Those tickets are genuinely available and are marked as for Sale on the SpiceJet website. 
However, I’d expect other airlines such as IndiGo to come up with their sales very quickly now. To find the best deal, it is always a good idea in this case to use a portal such as MakeMyTrip.
Bottomline
The next few days, you’ll see an onslaught of sales. Keep your wallet ready and start booking those trips for the rest of the year!
India to Dubai sector not opened yet for November.. except Kochi