Logan International in July 2025

69.2%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 July 2025, reporting carriers scheduled 12,912 domestic departures from Logan International (BOS). 69.2% left less than 15 minutes late and 67.7% reached their destination on time; 4.1% were cancelled.

Nationally that month, 69.7% of flights departed on time and 69.0% arrived on time, so BOS departures were 0.5 points below the national departure figure.

A year earlier, in July 2024, the airport had 12,953 departures with 71.3% leaving on time: a change of −2.1 points, with flights down 0%.

Flights arriving at BOS that month were on time 64.8% of the time (12,917 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 40%, national aviation system 31% and air carrier 25%.

On time 67.7%
Arrived 15+ minutes late 27.8%
Cancelled 4.1%
Diverted 0.5%

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

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

Measure	Jul 2025	Jul 2024	BOS, 12 months to Jul 2026	All reported flights, Jul 2025
Departed on time	69.2%	71.3%	74.4%	69.7%
Arrived on time	67.7%	70.2%	73.3%	69.0%
Cancelled	4.1%	2.9%	2.8%	2.5%
Average departure delay (late minutes only)	24.4 min	22.2 min	18.3 min	24.3 min
Scheduled departures a day	430	432	393	21,048
Scheduled departures	12,912	12,953	143,447	631,428

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
B6 JetBlue Airways	3,420	26%	64.4%	20.5 min	4.0%
YX Republic Airline	2,818	22%	66.0%	13.4 min	7.9%
DL Delta Air Lines	2,348	18%	71.3%	10.8 min	1.9%
AA American Airlines	1,448	11%	69.4%	14.5 min	4.1%
UA United Airlines	1,160	9%	69.8%	19.1 min	2.2%
WN Southwest Airlines	717	6%	66.1%	21.5 min	2.5%
AS Alaska Airlines	307	2%	63.2%	14.6 min	1.0%
NK Spirit Airlines	306	2%	70.3%	12.4 min	2.3%
MQ Envoy Air	183	1%	74.3%	6.9 min	2.7%
G4 Allegiant Air	100	1%	85.0%	0.1 min	0.0%
F9 Frontier Airlines	82	1%	80.5%	6.2 min	2.4%
HA Hawaiian Airlines	23	0%	47.8%	15.1 min	4.3%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BOS–DCA	Boston to Washington	750	64.9%	16.6 min	10.7%
BOS–ORD	Boston to Chicago	673	66.3%	20.3 min	3.3%
BOS–LGA	Boston to New York	592	65.9%	14.2 min	11.8%
BOS–JFK	Boston to New York	493	60.4%	26.4 min	10.1%
BOS–SFO	Boston to San Francisco	450	73.6%	4.1 min	0.2%
BOS–LAX	Boston to Los Angeles	439	72.4%	14.8 min	0.2%
BOS–DEN	Boston to Denver	427	67.2%	13.0 min	1.2%
BOS–ATL	Boston to Atlanta	425	72.2%	9.6 min	1.4%
BOS–PHL	Boston to Philadelphia	421	63.4%	23.8 min	6.7%
BOS–DFW	Boston to Dallas/Fort Worth	369	68.8%	11.7 min	3.0%
BOS–BWI	Boston to Baltimore	364	66.8%	25.3 min	6.0%
BOS–CLT	Boston to Charlotte	359	69.1%	10.9 min	5.3%

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), July 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2025	Minutes
Air carrier	25.4%	31.1%	74,743
Late-arriving aircraft	40.3%	40.8%	118,710
National Aviation System	31.4%	20.7%	92,313
Extreme weather	2.8%	7.3%	8,344
Security	0.1%	0.1%	228

294,338 delay minutes on 3,588 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 July 2025?

69.2% of 12,912 scheduled domestic departures left less than 15 minutes late, and 67.7% reached their destination on time. The national figures that month were 69.7% and 69.0%.

How does that compare with a year earlier?

In July 2024, 71.3% of 12,953 departures left on time and 2.9% were cancelled, against 69.2% and 4.1% in July 2025.

Provenance

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