Patrick Leahy Burlington International in May 2026

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 May 2026, reporting carriers scheduled 549 domestic departures from Patrick Leahy Burlington International (BTV). 85.4% left less than 15 minutes late and 80.5% reached their destination on time; 1.1% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so BTV departures were 8.3 points above the national departure figure.

A year earlier, in May 2025, the airport had 609 departures with 78.8% leaving on time: a change of +6.6 points, with flights down 10%.

Flights arriving at BTV that month were on time 81.0% of the time (547 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 40%, air carrier 29% and national aviation system 21%.

On time 80.5%
Arrived 15+ minutes late 18.0%
Cancelled 1.1%
Diverted 0.4%

Every scheduled departure from BTV in May 2026, judged by arrival at the destination.

May 2026 against a year earlier, the airport's year and the nation

Measure	May 2026	May 2025	BTV, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	85.4%	78.8%	76.9%	77.1%
Arrived on time	80.5%	74.5%	71.8%	77.6%
Cancelled	1.1%	2.6%	2.9%	0.9%
Average departure delay (late minutes only)	12.8 min	21.5 min	24.0 min	16.0 min
Scheduled departures a day	18	20	17	20,391
Scheduled departures	549	609	6,084	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OH PSA Airlines	213	39%	77.9%	2.6 min	1.4%
UA United Airlines	113	21%	79.6%	0.9 min	0.0%
OO SkyWest Airlines	98	18%	73.5%	19.7 min	2.0%
YX Republic Airline	66	12%	90.9%	-14.5 min	1.5%
DL Delta Air Lines	34	6%	97.1%	-13.0 min	0.0%
AA American Airlines	25	5%	84.0%	-1.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BTV–ORD	Burlington to Chicago	144	75.0%	15.7 min	1.4%
BTV–PHL	Burlington to Philadelphia	100	85.0%	-5.6 min	3.0%
BTV–DCA	Burlington to Washington	87	72.4%	7.2 min	1.1%
BTV–CLT	Burlington to Charlotte	71	78.9%	4.0 min	0.0%
BTV–EWR	Burlington to Newark	37	91.9%	-19.6 min	0.0%
BTV–ATL	Burlington to Atlanta	34	97.1%	-13.0 min	0.0%
BTV–DEN	Burlington to Denver	31	67.7%	2.3 min	0.0%
BTV–IAD	Burlington to Washington	29	96.6%	-11.4 min	0.0%
BTV–DTW	Burlington to Detroit	16	87.5%	-3.7 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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	29.3%	33.0%	2,120
Late-arriving aircraft	39.6%	40.4%	2,866
National Aviation System	20.7%	20.5%	1,500
Extreme weather	10.4%	6.0%	755
Security	0.0%	0.1%	2

7,243 delay minutes on 99 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 May 2026?

85.4% of 549 scheduled domestic departures left less than 15 minutes late, and 80.5% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 78.8% of 609 departures left on time and 2.6% were cancelled, against 85.4% and 1.1% in May 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2026; 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.