---
title: "SIN is which airport? Singapore"
description: "SIN is Singapore Changi Airport in Singapore. Why the code is SIN and not something you could guess, what WSSS means, and the codes it gets mixed up with."
url: https://atoneplace.net/airport/sin/
site: "At One Place"
---

# What airport is SIN?

**SIN is: Singapore Changi Airport**

Singapore

## Why the code is SIN

The first three letters of Singapore.

The airport authority or a contemporaneous record states this directly.

## The airport

- **IATA code:** SIN
- **ICAO code:** WSSS
- **Airport:** Singapore Changi Airport
- **City:** Singapore
- **Opened:** 1981
- **Code origin:** Documented

Changi has topped most global airport rankings for a decade and a half. Its Jewel complex holds a 40-metre indoor waterfall and is landside, so anyone can visit without a ticket — which is the point: the airport is treated as a national asset rather than infrastructure.

## The other code, WSSS

Every airport has two codes. The three-letter IATA code, SIN, is the one on your boarding pass and your luggage tag, and it is assigned for commercial use. The four-letter ICAO code, WSSS, is the one pilots and controllers use, and it is assigned geographically: the first letter or two identify the region, so every airport in the same part of the world shares a prefix. That is why WSSS looks nothing like SIN.

## Common questions

### What airport is SIN?

Singapore Changi Airport, in Singapore.

### Why is Singapore's airport called SIN?

The first three letters of Singapore.

### What is the difference between SIN and WSSS?

SIN is the IATA code, used commercially — tickets, timetables, luggage tags. WSSS is the ICAO code, used operationally by pilots and air traffic control, and assigned geographically by region.

## Related pages

- [Singapore](https://atoneplace.net/country/singapore/)
- [The flag of Singapore](https://atoneplace.net/flag/singapore/)
- [Airport codes in Singapore](https://atoneplace.net/airport/in/singapore/)

## Sources

- Official vendor product documentation — At One Place (/about/)