Spirit Airlines (NK) airline code, fares and API for travel agents
- IATA NK
- ICAO NKS
- Low-cost
Search Spirit Airlines (NK) fares
Spirit Airlines airline codes
- IATA code
- NK
- ICAO code
- NKS
- Main hub
- Fort Lauderdale (FLL)
- Alliance
- Not in a global alliance
- Airline type
- Low-cost
- Country
- United States
About Spirit Airlines
Spirit Airlines was a US ultra-low-cost carrier based in South Florida, with Fort Lauderdale as its largest base. It stopped flying in May 2026, when the company cancelled all flights and began winding down the business. Before that, Spirit flew within the United States and to the Caribbean, Mexico, Central America and northern South America, selling an unbundled ticket with seats, bags and other extras added separately. It was never a member of a global airline alliance. This page is kept as a reference for agents and developers who still see the NK code in old bookings, reports or data feeds.
Because the airline no longer operates, you should not expect Spirit Airlines fares in IATA.co search results. When you search live fares in the booking portal or through the flights API, you see whichever airlines our flight suppliers offer for your route and dates, and bookings are paid from your prepaid balance. On routes Spirit used to serve, other US carriers such as Frontier, JetBlue, Southwest and the larger network airlines may appear instead.
Spirit Airlines airline codes explained
Spirit Airlines uses the two-letter IATA airline code NK and the three-letter ICAO code NKS. The IATA code NK is the one shown on tickets, fare displays and booking screens, while the ICAO code NKS is used in air traffic control and flight planning.
Spirit Airlines is a low-cost carrier, based in United States, operating mainly from Fort Lauderdale (FLL). It is not part of a global airline alliance.
Booking Spirit Airlines fares as a travel agent
Travel agents book Spirit Airlines fares on IATA.co without their own IATA accreditation. Activate an agency account, top up a prepaid balance, then search live NK fares in the booking portal: the price, baggage and fare rules are shown with each offer before you confirm, and the amount is deducted from your balance. Spirit Airlines results appear whenever our flight suppliers return them for your route and dates, so what you can book follows live supplier content rather than a direct airline deal.
Search Spirit Airlines (NK) through the flights API
Developers and agencies can run the same Spirit Airlines search from their own site, app or back office through the IATA.co flights API. Filter a search by the carrier code NK and read the fares back as JSON, then book from the same prepaid balance. See the flights API and the API docs for the full reference.
GET /api/v1/flights/search?origin=FLL&destination=DXB&date=2026-12-14&carrier=NK
Host: iata.co
Authorization: Bearer YOUR_API_KEY
HTTP/1.1 200 OK
{
"carrier": "NK",
"flights": [
{ "airline": "NK", "from": "FLL", "to": "DXB", "price": 148.20 }
]
}Example request and response. Carrier codes filter the search; the full reference is unlocked with your API key.
Spirit Airlines at a glance
- Ceased flight operations in May 2026
- Was a US ultra-low-cost carrier based at Fort Lauderdale
- Flew within the US and to the Caribbean and Latin America
- Was not a member of any global alliance
Spirit Airlines (NK) questions
Spirit Airlines' two-letter IATA airline code is NK, and its three-letter ICAO code is NKS. The IATA code is the one you see on tickets, timetables and booking screens.
Spirit Airlines' ICAO code is NKS. ICAO codes are three letters and are used in air traffic control and flight planning, while the two-letter IATA code NK is used in ticketing and reservations.
Yes. On IATA.co you book Spirit Airlines fares through the platform from a prepaid balance, so you do not need your own IATA accreditation. Spirit Airlines fares appear in your results whenever our flight suppliers offer them for your route and dates.
It depends on what our flight suppliers return. Whenever Spirit Airlines content — including NDC fares — is offered by a connected supplier for your route and dates, it appears in your NK search results and can be booked from your balance or through the flights API.
No. Spirit Airlines cancelled all flights and began winding down its business in May 2026.
No, because the airline has stopped operating. A search on IATA.co shows fares from other airlines that our flight suppliers offer for your route and dates.
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