FlightStats (Cirium)
FlightStats, now a product of Cirium (formerly part of Ascend by Cirium), is the aviation industry's most trusted source of real-time flight status, historical on-time performance data, and airport operational data. Unlike GDS or booking APIs, FlightStats does not handle fares or reservations — it provides operational flight data: whether a flight is on time, delayed, cancelled, or diverted.
Overview
FlightStats, now a product of Cirium (formerly part of Ascend by Cirium), is the aviation industry's most trusted source of real-time flight status, historical on-time performance data, and airport operational data. Unlike GDS or booking APIs, FlightStats does not handle fares or reservations — it provides operational flight data: whether a flight is on time, delayed, cancelled, or diverted.
The API is used by travel apps, travel agencies, and airport operations software to provide live flight status updates, estimated arrival times, gate information, and delay notifications. Cirium's historical database covers 10+ years of flight data, enabling accurate delay probability calculations ("Flight AI-665 is historically delayed 23 minutes on Fridays").
Pros & Cons
Pros
- Most accurate and comprehensive flight status data
- Historical data for delay probability predictions
- Real-time alerts and webhooks
- Airport operational data including gates and terminals
- Used by airlines and airports themselves
Cons
- No fare or booking data — purely operational
- Pricing can be high for high-volume apps
- Not suitable as primary inventory API
- Requires approved access for live data
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