Cirium API
Cirium offers extensive REST APIs split across three developer portals: Developer Studio, the legacy FlightStats center, and Laminar Data Hub. The Flex surface covers flight status, schedules, alerts, and weather. Auth is a static appId plus appKey pair, and there is no official SDK.
Frequently asked questions
Cirium scores D on the API Report Card. Cirium offers extensive REST APIs split across three developer portals: Developer Studio, the legacy FlightStats center, and Laminar Data Hub. The Flex surface covers flight status, schedules, alerts, and weather. Auth is a static appId plus appKey pair, and there is no official SDK.
Without a usable official API, teams fall back on manual exports, file drops, or one-off vendor integrations. The other option is an unofficial API layer like Supergood that automates the authenticated web app directly.
Cirium is the aviation analytics arm of RELX (FTSE 100), formed in 2018 when Reed Business Information rebranded its FlightGlobal data and analytics assets.
Primary vertical: Fleet / Trucking / Logistics, specifically commercial aviation operations and the travel/cargo logistics stack built on top of flight data. An OTA or travel app calls the FlightStats / Cirium Sky Flight Status API to show current ETD/ETA, gate, terminal, and baggage carousel for a passenger's itinerary; subscribes to the Alerts API for push notifications when a flight changes; and uses Schedules and Connections APIs at search time.
Very high inside aviation, moderate-to-high in the broader travel stack.
Cirium feeds operationally critical workflows: live flight status driving passenger notifications and rebooking, FIDS data on airport display boards, schedule data feeding OTA and corporate travel search, aircraft positional data informing airline operations and air cargo ETA, emissions data feeding regulated sustainability reporting (CSRD, SEC climate), and aircraft valuations underpinning multi-million-dollar lease and finance decisions through Ascend.
Cirium as a brand is from 2018, but its DNA goes back decades: FlightStats was founded in 1999 (acquired by Cirium / RELX via the Conducive Technology / FlightGlobal lineage), and Ascend / Airclaims aircraft valuation work goes back to the 1970s.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.