Williston Basin International in May 2025

83.9%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In May 2025, reporting carriers scheduled 192 domestic departures from Williston Basin International (XWA). 83.9% left less than 15 minutes late and 74.5% reached their destination on time; 0.5% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so XWA departures were 7.2 points above the national departure figure.

A year earlier, in May 2024, the airport had 178 departures with 89.9% leaving on time: a change of −6.0 points, with flights up 8%.

Flights arriving at XWA that month were on time 80.8% of the time (193 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 35%, national aviation system 33% and extreme weather 14%.

On time 74.5%
Arrived 15+ minutes late 22.9%
Cancelled 0.5%
Diverted 2.1%

Every scheduled departure from XWA in May 2025, judged by arrival at the destination.

May 2025 against a year earlier, the airport's year and the nation

Measure	May 2025	May 2024	XWA, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	83.9%	89.9%	79.1%	76.7%
Arrived on time	74.5%	88.2%	76.5%	75.4%
Cancelled	0.5%	0.6%	1.5%	1.0%
Average departure delay (late minutes only)	17.3 min	13.7 min	25.4 min	17.5 min
Scheduled departures a day	6	6	7	20,188
Scheduled departures	192	178	2,411	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	192	100%	74.5%	13.5 min	0.5%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
XWA–DEN	Williston to Denver	130	69.2%	17.8 min	0.8%
XWA–MSP	Williston to Minneapolis	62	85.5%	4.5 min	0.0%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), May 2025.

Delay causes

BTS cause category	Share of delay minutes	National, May 2025	Minutes
Air carrier	35.3%	29.3%	1,510
Late-arriving aircraft	11.0%	37.8%	470
National Aviation System	32.6%	25.9%	1,395
Extreme weather	13.5%	6.9%	579
Security	7.6%	0.1%	327

4,281 delay minutes on 44 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left XWA on time in May 2025?

83.9% of 192 scheduled domestic departures left less than 15 minutes late, and 74.5% reached their destination on time. The national figures that month were 76.7% and 75.4%.

How does that compare with a year earlier?

In May 2024, 89.9% of 178 departures left on time and 0.6% were cancelled, against 83.9% and 0.5% in May 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for XWA · methodology · corrections.