About

seamlessfly (无忧航班) publishes flight-number-level on-time statistics for US carriers, focused on US–China routes, key Asia hubs (ICN, NRT, HND), and the US trunk routes Chinese travelers fly most.

Data

US domestic routes: US Bureau of Transportation Statistics (BTS) Airline On-Time Performance dataset, rolling 12 months. International routes: FlightAware flight history, rolling 3 months. On-time = arrival within 15 minutes of schedule. Both sources cover US carriers only — Chinese carriers (Air China, China Eastern, China Southern) are not included.

Method

Cancelled and diverted flights are excluded from on-time rates but shown separately. Weekday and month breakdowns need a minimum sample size before we draw conclusions — every page shows its sample size.