IATA Flight Number

GET/v0/iata/flight

Validates an IATA flight number in the standard format: a 2-character airline designator (letters or digits) followed by 1–4 digits and an optional single-letter operational suffix (e.g. LO123, AA100A, 6E2045). When the airline designator is recognised, the response includes the airline name, country, ICAO code, and radio callsign.

Guides: Node.js · Python

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Query Parameters

Parameter	Type	Required	Description
value	string	Yes	IATA flight number (e.g. `LO123`, `BA436`, `6E2045`). Input is case-insensitive and whitespace is ignored.

Example Request

curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://api.isvalid.dev/v0/iata/flight?value=LO123"

Response Fields

Field	Type	Description
valid	boolean	Whether the value matches the IATA flight number format
airlineCode	string	2-character IATA airline designator
flightNumber	number	Numeric flight number (1–9999)
suffix	string \| null	Single-letter operational suffix if present, otherwise `null`
airlineName	string \| null	Airline name if the designator is in the directory, otherwise `null`
countryCode	string \| null	ISO 3166-1 alpha-2 country of the airline
countryName	string \| null	Full English name of the airline's country
callsign	string \| null	ICAO radio telephony callsign of the airline
icao	string \| null	3-letter ICAO airline designator

Example Response — known airline

{
  "valid": true,
  "airlineCode": "LO",
  "flightNumber": 123,
  "suffix": null,
  "airlineName": "LOT Polish Airlines",
  "countryCode": "PL",
  "countryName": "Poland",
  "callsign": "POLLOT",
  "icao": "LOT"
}

Example Response — with suffix, unknown airline

{
  "valid": true,
  "airlineCode": "ZZ",
  "flightNumber": 42,
  "suffix": "A",
  "airlineName": null,
  "countryCode": null,
  "countryName": null,
  "callsign": null,
  "icao": null
}

Example Response — invalid format

{ "valid": false }