Williston Basin International in December 2025

60.6%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 December 2025, reporting carriers scheduled 203 domestic departures from Williston Basin International (XWA). 60.6% left less than 15 minutes late and 59.1% reached their destination on time; 0.5% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so XWA departures were 11.4 points below the national departure figure.

A year earlier, in December 2024, the airport had 178 departures with 74.7% leaving on time: a change of −14.1 points, with flights up 14%.

Flights arriving at XWA that month were on time 56.9% of the time (202 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 43%, extreme weather 22% and national aviation system 18%.

On time 59.1%
Arrived 15+ minutes late 39.9%
Cancelled 0.5%
Diverted 0.5%

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

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

Measure	Dec 2025	Dec 2024	XWA, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	60.6%	74.7%	79.1%	72.0%
Arrived on time	59.1%	69.7%	76.5%	71.9%
Cancelled	0.5%	0.6%	1.5%	1.5%
Average departure delay (late minutes only)	48.4 min	47.0 min	25.4 min	21.2 min
Scheduled departures a day	7	6	7	19,410
Scheduled departures	203	178	2,411	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	203	100%	59.1%	39.9 min	0.5%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
XWA–DEN	Williston to Denver	116	59.5%	38.8 min	0.9%
XWA–MSP	Williston to Minneapolis	87	58.6%	41.2 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), December 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	43.2%	33.3%	4,186
Late-arriving aircraft	16.6%	41.1%	1,605
National Aviation System	17.9%	19.1%	1,729
Extreme weather	22.2%	6.4%	2,152
Security	0.1%	0.2%	9

9,681 delay minutes on 81 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 December 2025?

60.6% of 203 scheduled domestic departures left less than 15 minutes late, and 59.1% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 74.7% of 178 departures left on time and 0.6% were cancelled, against 60.6% and 0.5% in December 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 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.