Idaho Falls Regional in December 2025

79.8%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 400 domestic departures from Idaho Falls Regional (IDA). 79.8% left less than 15 minutes late and 78.8% reached their destination on time; 0.3% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so IDA departures were 7.8 points above the national departure figure.

A year earlier, in December 2024, the airport had 328 departures with 83.2% leaving on time: a change of −3.4 points, with flights up 22%.

Flights arriving at IDA that month were on time 79.6% of the time (401 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 62%, late-arriving aircraft 19% and national aviation system 13%.

On time 78.8%
Arrived 15+ minutes late 20.5%
Cancelled 0.3%
Diverted 0.5%

Every scheduled departure from IDA 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	IDA, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	79.8%	83.2%	82.1%	72.0%
Arrived on time	78.8%	81.1%	80.5%	71.9%
Cancelled	0.3%	0.6%	0.7%	1.5%
Average departure delay (late minutes only)	23.4 min	38.4 min	21.1 min	21.2 min
Scheduled departures a day	13	11	13	19,410
Scheduled departures	400	328	4,724	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	298	75%	79.9%	6.4 min	0.0%
G4 Allegiant Air	57	14%	70.2%	16.1 min	0.0%
DL Delta Air Lines	31	8%	80.6%	46.6 min	3.2%
UA United Airlines	14	4%	85.7%	8.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IDA–DEN	Idaho Falls to Denver	136	77.9%	10.2 min	0.0%
IDA–SLC	Idaho Falls to Salt Lake City	90	85.6%	10.1 min	1.1%
IDA–SEA	Idaho Falls to Seattle	55	74.5%	8.9 min	0.0%
IDA–DFW	Idaho Falls to Dallas/Fort Worth	31	74.2%	14.6 min	0.0%
IDA–PHX	Idaho Falls to Phoenix	31	90.3%	7.2 min	0.0%
IDA–AZA	Idaho Falls to Phoenix	26	61.5%	28.2 min	0.0%
IDA–LAS	Idaho Falls to Las Vegas	15	80.0%	3.6 min	0.0%
IDA–PDX	Idaho Falls to Portland	8	75.0%	5.6 min	0.0%
IDA–SNA	Idaho Falls to Santa Ana	8	75.0%	10.6 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), December 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	61.8%	33.3%	5,635
Late-arriving aircraft	18.8%	41.1%	1,712
National Aviation System	13.2%	19.1%	1,202
Extreme weather	6.3%	6.4%	576
Security	0.0%	0.2%	0

9,125 delay minutes on 82 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 December 2025?

79.8% of 400 scheduled domestic departures left less than 15 minutes late, and 78.8% 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, 83.2% of 328 departures left on time and 0.6% were cancelled, against 79.8% and 0.3% 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 IDA · methodology · corrections.