One month ahead vs one day before: How flight fares compare

On the morning of 28 October 2026, advertised fares into Chennai showed that booking 30 days ahead cost 23.9 per cent less than booking the day before, measured across seven routes. That gap is 10.2 percentage points better than the national network figure of 13.7 per cent. The cheapest point across those seven routes was 60 days before departure, and every one of the seven routes was cheaper at 30 days than the day before.