OO4021: Salt Lake City to Boise

Questions and answers

Is OO4021 usually on time?

85% of SkyWest Airlines flight OO4021's 312 flights from August 2025 to July 2026 arrived within 15 minutes of schedule, 7.1 points above the US average of 77.6%. It arrived about 5 minutes late on average.

How often is OO4021 cancelled or badly delayed?

1% of OO4021's scheduled flights were cancelled from August 2025 to July 2026 (3 of 312), and 10% of the flights that operated arrived more than 30 minutes late.

What route does OO4021 fly?

OO4021 most often flies from Salt Lake City (SLC) to Boise (BOI), 466 km (128 flights in the period). The same flight number also flew Atlanta (ATL) to Charleston (CRW), Detroit (DTW) to Buffalo Niagara (BUF), Buffalo Niagara (BUF) to Detroit (DTW).

Where do these OO4021 figures come from?

From the US Bureau of Transportation Statistics (BTS) on-time records, which cover every domestic flight by the larger US airlines. The figures cover August 2025 to July 2026 and are updated each month when new BTS data is published, about two months after the month ends. See how TripStow measures punctuality.