Idaho Falls Regional in September 2025

83.7%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 September 2025, reporting carriers scheduled 387 domestic departures from Idaho Falls Regional (IDA). 83.7% left less than 15 minutes late and 81.1% reached their destination on time; 0.3% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so IDA departures were 0.6 points above the national departure figure.

A year earlier, in September 2024, the airport had 301 departures with 90.7% leaving on time: a change of −7.0 points, with flights up 29%.

Flights arriving at IDA that month were on time 81.7% of the time (387 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 65%, late-arriving aircraft 16% and national aviation system 12%.

On time 81.1%
Arrived 15+ minutes late 17.6%
Cancelled 0.3%
Diverted 1.0%

Every scheduled departure from IDA in September 2025, judged by arrival at the destination.

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

Measure	Sep 2025	Sep 2024	IDA, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	83.7%	90.7%	82.1%	83.1%
Arrived on time	81.1%	89.7%	80.5%	82.8%
Cancelled	0.3%	0.0%	0.7%	0.5%
Average departure delay (late minutes only)	19.6 min	7.0 min	21.1 min	12.2 min
Scheduled departures a day	13	10	13	18,748
Scheduled departures	387	301	4,724	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	321	83%	81.0%	8.1 min	0.3%
G4 Allegiant Air	36	9%	66.7%	59.8 min	0.0%
DL Delta Air Lines	30	8%	100.0%	-6.8 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IDA–DEN	Idaho Falls to Denver	164	80.5%	12.5 min	0.0%
IDA–SLC	Idaho Falls to Salt Lake City	97	95.9%	-6.1 min	0.0%
IDA–DFW	Idaho Falls to Dallas/Fort Worth	60	83.3%	2.5 min	1.7%
IDA–ORD	Idaho Falls to Chicago	30	50.0%	27.4 min	0.0%
IDA–AZA	Idaho Falls to Phoenix	17	70.6%	34.1 min	0.0%
IDA–LAS	Idaho Falls to Las Vegas	9	77.8%	9.3 min	0.0%
IDA–SNA	Idaho Falls to Santa Ana	9	44.4%	166.6 min	0.0%
IDA–OAK	Idaho Falls to Oakland	1	100.0%	-8.0 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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	65.4%	34.3%	4,995
Late-arriving aircraft	16.1%	37.4%	1,227
National Aviation System	12.2%	22.6%	931
Extreme weather	6.3%	5.6%	485
Security	0.0%	0.1%	0

7,638 delay minutes on 68 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 IDA on time in September 2025?

83.7% of 387 scheduled domestic departures left less than 15 minutes late, and 81.1% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 90.7% of 301 departures left on time and 0.0% were cancelled, against 83.7% and 0.3% in September 2025.

Provenance

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