Helena Regional in May 2026

97.6%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 May 2026, reporting carriers scheduled 124 domestic departures from Helena Regional (HLN). 97.6% left less than 15 minutes late and 96.8% reached their destination on time; 0.0% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so HLN departures were 20.5 points above the national departure figure.

A year earlier, in May 2025, the airport had 148 departures with 85.8% leaving on time: a change of +11.8 points, with flights down 16%.

Flights arriving at HLN that month were on time 92.7% of the time (124 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 97%, late-arriving aircraft 2% and national aviation system 1%.

On time 96.8%
Arrived 15+ minutes late 3.2%
Cancelled 0.0%
Diverted 0.0%

Every scheduled departure from HLN 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	HLN, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	97.6%	85.8%	89.3%	77.1%
Arrived on time	96.8%	79.7%	87.5%	77.6%
Cancelled	0.0%	0.7%	0.4%	0.9%
Average departure delay (late minutes only)	6.5 min	15.7 min	11.4 min	16.0 min
Scheduled departures a day	4	5	4	20,391
Scheduled departures	124	148	1,549	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	124	100%	96.8%	-7.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
HLN–DEN	Helena to Denver	62	93.5%	-2.1 min	0.0%
HLN–SLC	Helena to Salt Lake City	62	100.0%	-12.8 min	0.0%

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	96.5%	33.0%	777
Late-arriving aircraft	2.1%	40.4%	17
National Aviation System	1.4%	20.5%	11
Extreme weather	0.0%	6.0%	0
Security	0.0%	0.1%	0

805 delay minutes on 4 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 HLN on time in May 2026?

97.6% of 124 scheduled domestic departures left less than 15 minutes late, and 96.8% 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, 85.8% of 148 departures left on time and 0.7% were cancelled, against 97.6% and 0.0% 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 HLN · methodology · corrections.