Are these deals for real on scoot airlines? https://www.flyscoot.com/en/promotions/real-deal-india?utm_source=in-email&utm_medium=email&utm_campaign=PR
You should check out kayak they are one of the best when it comes to cheapest airfare. They also recommend whether a round trip to your destination is cheaper or if trips to and from your destination are better. Worked well with me when I travelled south east Asia this summer :)
As mentioned by Sreshti, skyscanner is a good way to find cheap flights. Also look out for Air Asia deals - sometimes you get amazing discounts (but look out for restrictions on cancellations and baggage allowance)