Williston Basin International in May 2026

89.1%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 2026, reporting carriers scheduled 201 domestic departures from Williston Basin International (XWA). 89.1% left less than 15 minutes late and 88.6% reached their destination on time; 1.5% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so XWA departures were 12.0 points above the national departure figure.

A year earlier, in May 2025, the airport had 192 departures with 83.9% leaving on time: a change of +5.2 points, with flights up 5%.

Flights arriving at XWA that month were on time 79.5% of the time (200 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 44%, late-arriving aircraft 24% and extreme weather 22%.

On time 88.6%
Arrived 15+ minutes late 10.0%
Cancelled 1.5%
Diverted 0.0%

Every scheduled departure from XWA in May 2026, judged by arrival at the destination.

May 2026 against a year earlier, the airport's year and the nation

Measure	May 2026	May 2025	XWA, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	89.1%	83.9%	79.1%	77.1%
Arrived on time	88.6%	74.5%	76.5%	77.6%
Cancelled	1.5%	0.5%	1.5%	0.9%
Average departure delay (late minutes only)	12.2 min	17.3 min	25.4 min	16.0 min
Scheduled departures a day	7	6	7	20,391
Scheduled departures	201	192	2,411	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	201	100%	88.6%	-2.6 min	1.5%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
XWA–DEN	Williston to Denver	115	85.2%	0.9 min	0.9%
XWA–MSP	Williston to Minneapolis	86	93.0%	-7.3 min	2.3%

By scheduled departure hour

100

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

Share of departures that left less than 15 minutes late, by scheduled hour (local time), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	43.8%	33.0%	1,001
Late-arriving aircraft	23.5%	40.4%	538
National Aviation System	11.1%	20.5%	253
Extreme weather	21.6%	6.0%	494
Security	0.0%	0.1%	0

2,286 delay minutes on 20 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 2026?

89.1% of 201 scheduled domestic departures left less than 15 minutes late, and 88.6% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 83.9% of 192 departures left on time and 0.5% were cancelled, against 89.1% and 1.5% in May 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2026; 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.