Delhi
You leave from Indira Gandhi International (DEL), India’s busiest airport and the northern anchor of this sector. Because DEL–BLR runs across the whole day rather than in two bunched banks, missing a morning departure rarely costs you the day — which is the single most useful thing to know when you are booking in a hurry. IGI operates three passenger terminals, so confirm which one your flight actually leaves from before you set out; the inter-terminal move is not quick. Fares move fastest around the Monday-morning and Friday-evening business banks, festival windows, and Delhi’s winter fog mornings, when knock-on delays reshuffle availability across the day.