IndiGo is celebrating its 20th anniversary by giving away 20,000 free domestic flight tickets through fare refunds. To celebrate its 20th anniversary, IndiGo has rolled out a limited-time campaign that could see thousands of passengers getting their airfare back. How the 'IndiGoFree' offer worksThe promotion is open to passengers booking domestic flights between August 4 and August 6, 2026. Only flights purchased directly from IndiGo qualify for the giveaway, making the airline's own digital channels the sole entry point for the campaign. Celebrating two decades of growthThe anniversary campaign coincides with a significant milestone for IndiGo, which completed 20 years of commercial operations this week.