Logan International in August 2025

79.3%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 August 2025, reporting carriers scheduled 12,461 domestic departures from Logan International (BOS). 79.3% left less than 15 minutes late and 80.3% reached their destination on time; 1.0% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so BOS departures were 2.5 points above the national departure figure.

A year earlier, in August 2024, the airport had 13,215 departures with 70.5% leaving on time: a change of +8.8 points, with flights down 6%.

Flights arriving at BOS that month were on time 77.7% of the time (12,457 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 42%, air carrier 32% and national aviation system 24%.

On time 80.3%
Arrived 15+ minutes late 18.4%
Cancelled 1.0%
Diverted 0.3%

Every scheduled departure from BOS in August 2025, judged by arrival at the destination.

August 2025 against a year earlier, the airport's year and the nation

Measure	Aug 2025	Aug 2024	BOS, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	79.3%	70.5%	74.4%	76.8%
Arrived on time	80.3%	69.9%	73.3%	76.3%
Cancelled	1.0%	3.7%	2.8%	1.1%
Average departure delay (late minutes only)	14.5 min	22.7 min	18.3 min	17.6 min
Scheduled departures a day	415	441	393	20,079
Scheduled departures	12,461	13,215	143,447	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
B6 JetBlue Airways	3,281	26%	78.3%	3.7 min	0.7%
YX Republic Airline	2,639	21%	84.1%	-3.7 min	1.5%
DL Delta Air Lines	2,294	18%	83.0%	1.8 min	0.7%
AA American Airlines	1,516	12%	78.5%	5.6 min	1.6%
UA United Airlines	1,154	9%	77.1%	5.3 min	1.1%
WN Southwest Airlines	643	5%	75.7%	8.9 min	0.8%
AS Alaska Airlines	287	2%	76.0%	0.6 min	0.0%
NK Spirit Airlines	282	2%	78.4%	4.9 min	1.1%
MQ Envoy Air	182	1%	85.2%	-0.4 min	0.0%
F9 Frontier Airlines	88	1%	77.3%	3.1 min	1.1%
G4 Allegiant Air	75	1%	92.0%	-1.1 min	0.0%
HA Hawaiian Airlines	20	0%	60.0%	10.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BOS–DCA	Boston to Washington	741	80.8%	6.5 min	1.6%
BOS–ORD	Boston to Chicago	683	71.7%	10.4 min	2.2%
BOS–LGA	Boston to New York	568	84.7%	-2.0 min	1.9%
BOS–JFK	Boston to New York	500	80.6%	4.0 min	1.2%
BOS–LAX	Boston to Los Angeles	433	85.2%	-3.3 min	0.0%
BOS–SFO	Boston to San Francisco	431	84.2%	-5.2 min	0.2%
BOS–PHL	Boston to Philadelphia	409	78.7%	2.4 min	1.7%
BOS–ATL	Boston to Atlanta	403	80.6%	5.4 min	1.2%
BOS–DEN	Boston to Denver	397	77.6%	3.3 min	0.5%
BOS–CLT	Boston to Charlotte	353	86.4%	-3.3 min	0.8%
BOS–MCO	Boston to Orlando	353	74.8%	5.9 min	1.1%
BOS–DFW	Boston to Dallas/Fort Worth	345	73.6%	8.5 min	1.7%

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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	31.9%	33.1%	50,130
Late-arriving aircraft	42.2%	40.5%	66,251
National Aviation System	23.7%	19.2%	37,302
Extreme weather	2.1%	7.0%	3,260
Security	0.1%	0.1%	147

157,090 delay minutes on 2,290 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 August 2025?

79.3% of 12,461 scheduled domestic departures left less than 15 minutes late, and 80.3% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 70.5% of 13,215 departures left on time and 3.7% were cancelled, against 79.3% and 1.0% in August 2025.

Provenance

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