Logan International in September 2025

72.9%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 11,597 domestic departures from Logan International (BOS). 72.9% left less than 15 minutes late and 74.6% reached their destination on time; 1.4% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so BOS departures were 10.2 points below the national departure figure.

A year earlier, in September 2024, the airport had 12,359 departures with 83.6% leaving on time: a change of −10.7 points, with flights down 6%.

Flights arriving at BOS that month were on time 62.7% of the time (11,596 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 56%, air carrier 24% and national aviation system 17%.

On time 74.6%
Arrived 15+ minutes late 23.9%
Cancelled 1.4%
Diverted 0.2%

Every scheduled departure from BOS 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	BOS, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	72.9%	83.6%	74.4%	83.1%
Arrived on time	74.6%	83.7%	73.3%	82.8%
Cancelled	1.4%	0.4%	2.8%	0.5%
Average departure delay (late minutes only)	20.6 min	12.0 min	18.3 min	12.2 min
Scheduled departures a day	387	412	393	18,748
Scheduled departures	11,597	12,359	143,447	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
B6 JetBlue Airways	2,872	25%	80.5%	-0.7 min	0.9%
YX Republic Airline	2,574	22%	72.1%	7.3 min	3.1%
DL Delta Air Lines	2,199	19%	74.8%	11.6 min	0.6%
AA American Airlines	1,408	12%	71.9%	11.2 min	1.2%
UA United Airlines	1,144	10%	73.9%	11.3 min	0.8%
WN Southwest Airlines	621	5%	61.2%	23.5 min	0.5%
AS Alaska Airlines	245	2%	78.0%	5.0 min	0.4%
NK Spirit Airlines	215	2%	67.9%	15.1 min	3.3%
MQ Envoy Air	176	2%	79.0%	4.4 min	1.1%
F9 Frontier Airlines	74	1%	78.4%	4.4 min	0.0%
G4 Allegiant Air	51	0%	88.2%	5.6 min	0.0%
HA Hawaiian Airlines	18	0%	88.9%	-11.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BOS–DCA	Boston to Washington	762	67.6%	13.4 min	1.8%
BOS–ORD	Boston to Chicago	660	67.4%	16.5 min	0.6%
BOS–LGA	Boston to New York	634	75.1%	5.8 min	3.2%
BOS–JFK	Boston to New York	545	77.2%	1.7 min	2.6%
BOS–PHL	Boston to Philadelphia	428	75.5%	4.9 min	1.9%
BOS–SFO	Boston to San Francisco	408	81.4%	1.4 min	0.0%
BOS–ATL	Boston to Atlanta	401	82.5%	2.4 min	0.2%
BOS–LAX	Boston to Los Angeles	364	79.1%	7.0 min	0.0%
BOS–EWR	Boston to Newark	336	68.8%	18.2 min	3.0%
BOS–DEN	Boston to Denver	333	72.1%	8.3 min	0.3%
BOS–CLT	Boston to Charlotte	318	70.4%	10.3 min	1.9%
BOS–DFW	Boston to Dallas/Fort Worth	313	68.7%	17.2 min	2.6%

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	24.3%	34.3%	49,042
Late-arriving aircraft	55.6%	37.4%	112,240
National Aviation System	16.9%	22.6%	34,150
Extreme weather	3.0%	5.6%	6,085
Security	0.1%	0.1%	239

201,756 delay minutes on 2,772 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 BOS on time in September 2025?

72.9% of 11,597 scheduled domestic departures left less than 15 minutes late, and 74.6% 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, 83.6% of 12,359 departures left on time and 0.4% were cancelled, against 72.9% and 1.4% 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 BOS · methodology · corrections.