Indianapolis International in September 2025

85.4%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 3,742 domestic departures from Indianapolis International (IND). 85.4% left less than 15 minutes late and 84.4% reached their destination on time; 0.6% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so IND departures were 2.3 points above the national departure figure.

A year earlier, in September 2024, the airport had 3,818 departures with 87.7% leaving on time: a change of −2.3 points, with flights down 2%.

Flights arriving at IND that month were on time 82.5% of the time (3,740 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, national aviation system 37%, late-arriving aircraft 36% and air carrier 27%.

On time 84.4%
Arrived 15+ minutes late 14.8%
Cancelled 0.6%
Diverted 0.2%

Every scheduled departure from IND 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	IND, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	85.4%	87.7%	79.4%	83.1%
Arrived on time	84.4%	87.3%	78.9%	82.8%
Cancelled	0.6%	0.5%	1.9%	0.5%
Average departure delay (late minutes only)	10.3 min	8.1 min	14.9 min	12.2 min
Scheduled departures a day	125	127	133	18,748
Scheduled departures	3,742	3,818	48,559	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	1,074	29%	84.2%	1.2 min	0.7%
WN Southwest Airlines	834	22%	83.2%	2.4 min	0.0%
AA American Airlines	521	14%	80.4%	6.9 min	1.5%
DL Delta Air Lines	403	11%	92.8%	-11.2 min	0.2%
UA United Airlines	272	7%	83.8%	5.0 min	0.0%
NK Spirit Airlines	196	5%	89.8%	2.8 min	0.5%
OO SkyWest Airlines	145	4%	91.0%	-7.5 min	0.7%
MQ Envoy Air	103	3%	74.8%	13.9 min	1.9%
F9 Frontier Airlines	71	2%	74.6%	3.4 min	0.0%
G4 Allegiant Air	64	2%	92.2%	-3.8 min	0.0%
AS Alaska Airlines	51	1%	74.5%	1.5 min	0.0%
OH PSA Airlines	8	0%	75.0%	-0.9 min	12.5%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IND–ORD	Indianapolis to Chicago	391	81.6%	4.0 min	0.5%
IND–ATL	Indianapolis to Atlanta	278	94.6%	-13.3 min	0.0%
IND–LGA	Indianapolis to New York	218	87.6%	-3.3 min	0.0%
IND–DEN	Indianapolis to Denver	213	82.2%	3.8 min	0.0%
IND–DFW	Indianapolis to Dallas/Fort Worth	200	79.5%	9.3 min	2.5%
IND–EWR	Indianapolis to Newark	199	88.4%	-2.8 min	1.5%
IND–DCA	Indianapolis to Washington	172	79.1%	7.8 min	1.2%
IND–BOS	Indianapolis to Boston	160	59.4%	17.7 min	2.5%
IND–MCO	Indianapolis to Orlando	151	84.1%	0.6 min	0.0%
IND–CLT	Indianapolis to Charlotte	148	86.5%	-1.3 min	0.0%
IND–MSP	Indianapolis to Minneapolis	107	81.3%	-0.6 min	0.9%
IND–PHL	Indianapolis to Philadelphia	102	82.4%	1.3 min	2.0%

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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	27.2%	34.3%	10,189
Late-arriving aircraft	35.9%	37.4%	13,459
National Aviation System	36.6%	22.6%	13,704
Extreme weather	0.3%	5.6%	114
Security	0.0%	0.1%	7

37,473 delay minutes on 555 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 IND on time in September 2025?

85.4% of 3,742 scheduled domestic departures left less than 15 minutes late, and 84.4% 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, 87.7% of 3,818 departures left on time and 0.5% were cancelled, against 85.4% and 0.6% 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 IND · methodology · corrections.