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How Flight Prices Actually Change — The Algorithm Exposed

Updated June 25, 2026 | 6 min read

You checked a flight at ₹4,000 yesterday. Today it's ₹5,500. Tomorrow it might drop to ₹3,800. What's going on? Here's how airline pricing really works.

The Fare Bucket System

Airlines don't have ONE price. They have 10-26 fare "buckets" per flight, from cheapest to most expensive. As seats sell, the system moves you up to the next bucket.

BucketSeatsPriceWhen Available
S (Super Saver)5-10₹2,500First to sell out — 6-8 weeks early
L (Low)15-20₹3,5003-5 weeks before
Q (Regular)30-40₹4,5002-3 weeks before
Y (Full Fare)Unlimited₹7,000+Last minute / peak demand

What Triggers Price Changes

  1. 📊 Seats sold: More seats sold = higher bucket = higher price
  2. 📅 Days to departure: Prices generally rise as date approaches
  3. 📈 Search demand: High search volume on a route signals the algorithm to raise prices
  4. 🎪 Events/holidays: Festival, cricket match, long weekend = price spike
  5. 🏢 Competitor pricing: Airlines monitor rivals and adjust within minutes

How to Beat the System

  • 🎯 Sweet spot: Book 15-21 days before domestic departure
  • 📅 Day matters: Tuesday flights are 12% cheaper
  • 🕐 Time matters: 6 AM and 10 PM flights are cheapest
  • 🔔 Set alerts: Use TheBookFlight to compare — don't trust one source
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