Williston Basin International in April 2025

77.3%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 April 2025, reporting carriers scheduled 176 domestic departures from Williston Basin International (XWA). 77.3% left less than 15 minutes late and 72.2% reached their destination on time; 1.1% were cancelled.

Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so XWA departures were 3.3 points below the national departure figure.

A year earlier, in April 2024, the airport had 146 departures with 91.1% leaving on time: a change of −13.8 points, with flights up 21%.

Flights arriving at XWA that month were on time 76.7% of the time (176 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 59%, national aviation system 32% and late-arriving aircraft 8%.

On time 72.2%
Arrived 15+ minutes late 25.0%
Cancelled 1.1%
Diverted 1.7%

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

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

Measure	Apr 2025	Apr 2024	XWA, 12 months to Jul 2026	All reported flights, Apr 2025
Departed on time	77.3%	91.1%	79.1%	80.6%
Arrived on time	72.2%	91.1%	76.5%	79.5%
Cancelled	1.1%	0.0%	1.5%	0.8%
Average departure delay (late minutes only)	27.3 min	8.2 min	25.4 min	14.1 min
Scheduled departures a day	6	5	7	19,465
Scheduled departures	176	146	2,411	583,950

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	176	100%	72.2%	20.7 min	1.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
XWA–DEN	Williston to Denver	116	67.2%	31.2 min	0.9%
XWA–MSP	Williston to Minneapolis	60	81.7%	0.9 min	1.7%

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), April 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2025	Minutes
Air carrier	58.8%	32.7%	3,015
Late-arriving aircraft	8.0%	39.4%	411
National Aviation System	32.2%	22.2%	1,653
Extreme weather	1.0%	5.5%	52
Security	0.0%	0.2%	0

5,131 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 April 2025?

77.3% of 176 scheduled domestic departures left less than 15 minutes late, and 72.2% reached their destination on time. The national figures that month were 80.6% and 79.5%.

How does that compare with a year earlier?

In April 2024, 91.1% of 146 departures left on time and 0.0% were cancelled, against 77.3% and 1.1% in April 2025.

Provenance

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