The absolute cheapest flight route in India is difficult to pinpoint definitively due to constant price fluctuations. However, several routes consistently offer budget-friendly options:

Top contenders:

• North Lakhimpur to Lilabari (Assam): As low as ₹147 (one-way)
• Shillong to Lilabari (Assam): Around ₹200-₹300 (one-way)
• Short hops within the Northeast: Guwahati to Pasighat, Imphal to Aizawl, Tezpur to North Lakhimpur (often under ₹1,000)