Best Travel related booking App/website

hmm well there is Make My Trip which offers MyCash credit so you can use it for 0% interest for some days for hotel booking and travel, if are frequent traveler check that

If you are an HDFC credit/debit card holder then HDFC SmartBuy is always a good option. An awful lot of people have HDFC Regalia and reward points that they don't know what to do with. You get the most value if you do a hotel or flight booking using those reward points.