Patrick Leahy Burlington International in December 2025

69.8%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 394 domestic departures from Patrick Leahy Burlington International (BTV). 69.8% left less than 15 minutes late and 57.4% reached their destination on time; 2.8% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so BTV departures were 2.2 points below the national departure figure.

A year earlier, in December 2024, the airport had 673 departures with 79.6% leaving on time: a change of −9.8 points, with flights down 41%.

Flights arriving at BTV that month were on time 59.1% of the time (396 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 39%, late-arriving aircraft 31% and national aviation system 23%.

On time 57.4%
Arrived 15+ minutes late 39.6%
Cancelled 2.8%
Diverted 0.3%

Every scheduled departure from BTV 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	BTV, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	69.8%	79.6%	76.9%	72.0%
Arrived on time	57.4%	72.5%	71.8%	71.9%
Cancelled	2.8%	0.6%	2.9%	1.5%
Average departure delay (late minutes only)	35.0 min	18.7 min	24.0 min	21.2 min
Scheduled departures a day	13	22	17	19,410
Scheduled departures	394	673	6,084	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OH PSA Airlines	174	44%	50.0%	53.9 min	4.6%
YX Republic Airline	91	23%	79.1%	0.4 min	2.2%
UA United Airlines	51	13%	58.8%	19.0 min	0.0%
OO SkyWest Airlines	47	12%	44.7%	48.0 min	0.0%
DL Delta Air Lines	31	8%	51.6%	31.8 min	3.2%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BTV–PHL	Burlington to Philadelphia	92	65.2%	19.4 min	4.3%
BTV–DCA	Burlington to Washington	89	44.9%	79.3 min	3.4%
BTV–ORD	Burlington to Chicago	76	56.6%	23.5 min	0.0%
BTV–EWR	Burlington to Newark	45	73.3%	1.0 min	2.2%
BTV–ATL	Burlington to Atlanta	31	51.6%	31.8 min	3.2%
BTV–CLT	Burlington to Charlotte	31	61.3%	11.4 min	6.5%
BTV–DTW	Burlington to Detroit	21	38.1%	62.0 min	0.0%
BTV–LGA	Burlington to New York	8	87.5%	9.1 min	0.0%
BTV–DEN	Burlington to Denver	1	0.0%	139.0 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), December 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	38.9%	33.3%	6,081
Late-arriving aircraft	31.4%	41.1%	4,899
National Aviation System	23.3%	19.1%	3,645
Extreme weather	5.9%	6.4%	929
Security	0.4%	0.2%	67

15,621 delay minutes on 156 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 December 2025?

69.8% of 394 scheduled domestic departures left less than 15 minutes late, and 57.4% 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, 79.6% of 673 departures left on time and 0.6% were cancelled, against 69.8% and 2.8% 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 BTV · methodology · corrections.