Patrick Leahy Burlington International in September 2025

81.9%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 565 domestic departures from Patrick Leahy Burlington International (BTV). 81.9% left less than 15 minutes late and 79.1% reached their destination on time; 0.4% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so BTV departures were 1.2 points below the national departure figure.

A year earlier, in September 2024, the airport had 873 departures with 90.0% leaving on time: a change of −8.1 points, with flights down 35%.

Flights arriving at BTV that month were on time 83.2% of the time (565 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 41%, late-arriving aircraft 31% and national aviation system 27%.

On time 79.1%
Arrived 15+ minutes late 20.4%
Cancelled 0.4%
Diverted 0.2%

Every scheduled departure from BTV 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	BTV, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	81.9%	90.0%	76.9%	83.1%
Arrived on time	79.1%	86.4%	71.8%	82.8%
Cancelled	0.4%	0.2%	2.9%	0.5%
Average departure delay (late minutes only)	17.7 min	8.5 min	24.0 min	12.2 min
Scheduled departures a day	19	29	17	18,748
Scheduled departures	565	873	6,084	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OH PSA Airlines	148	26%	87.2%	-5.7 min	0.0%
YX Republic Airline	134	24%	86.6%	0.4 min	0.7%
AA American Airlines	100	18%	61.0%	31.6 min	1.0%
UA United Airlines	90	16%	76.7%	15.0 min	0.0%
MQ Envoy Air	52	9%	65.4%	17.7 min	0.0%
DL Delta Air Lines	31	5%	96.8%	-5.4 min	0.0%
OO SkyWest Airlines	10	2%	80.0%	67.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BTV–ORD	Burlington to Chicago	122	75.4%	11.9 min	0.0%
BTV–DCA	Burlington to Washington	116	69.8%	22.9 min	0.9%
BTV–EWR	Burlington to Newark	89	82.0%	4.9 min	1.1%
BTV–PHL	Burlington to Philadelphia	76	77.6%	4.1 min	0.0%
BTV–CLT	Burlington to Charlotte	60	90.0%	-12.2 min	0.0%
BTV–IAD	Burlington to Washington	33	93.9%	-4.0 min	0.0%
BTV–ATL	Burlington to Atlanta	31	96.8%	-5.4 min	0.0%
BTV–DEN	Burlington to Denver	30	63.3%	49.8 min	0.0%
BTV–LGA	Burlington to New York	8	100.0%	-20.7 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	41.1%	34.3%	4,176
Late-arriving aircraft	31.1%	37.4%	3,162
National Aviation System	27.1%	22.6%	2,752
Extreme weather	0.8%	5.6%	82
Security	0.0%	0.1%	0

10,172 delay minutes on 115 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 BTV on time in September 2025?

81.9% of 565 scheduled domestic departures left less than 15 minutes late, and 79.1% 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, 90.0% of 873 departures left on time and 0.2% were cancelled, against 81.9% and 0.4% 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 BTV · methodology · corrections.