Airport month record

BOSAPR

Boston Logan International in April 2026

Departures: 12,626
Month: April 2026
National, same month: 79.8%
Carriers: 11

Historical statistics for April 2026, not live status or a forecast for this year’s April. For today’s conditions at BOS, see live FAA status.

BOS in April lands a B+, level with the national rate of 79.8%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 12,626 flights, of which United Airlines flew 1,063 at 86.5% on time.

United Airlines is the most reliable of the six carriers covered here at 86.5% on time across 1,063 flights.

On time

79.3%

Arrivals under 15 minutes late, of 12,558 completed departures

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

0.31%

Nationally in April: 0.90%

Whole year

75.6%

BOS across all twelve months

These figures cover 12,626 departures from Boston Logan International in April 2026. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.

Against the year

April next to BOS's other months

Against BOS's own year, April ran 4 points better than the twelve-month rate of 75.6%, which makes it number three of twelve months, best first. Cancellations were unusually low for BOS in April, at 0.31% against 2.64% across the year. Either side of it, March ran 74.1% on time and May 79.4%, so a trip moved by a few weeks would have landed in a worse stretch.

BOS month by month
Month	Flights	On time	Avg delay	Cancelled	Grade
July 2025	12,912	70.9%	82 min	4.07%	C−
August 2025	12,461	81.4%	69 min	1.00%	B
September 2025	11,597	75.7%	73 min	1.35%	B
October 2025	12,647	73.9%	75 min	1.51%	C
November 2025	11,385	78.0%	75 min	2.76%	B
December 2025	11,248	68.7%	71 min	1.69%	C
January 2026	10,298	73.6%	78 min	7.50%	C−
February 2026	10,232	74.8%	73 min	8.15%	C−
March 2026	12,299	74.1%	69 min	2.69%	C
April 2026 (this page)	12,626	79.3%	62 min	0.31%	B+
May 2026	12,694	79.4%	60 min	0.61%	B+
June 2026	12,683	76.6%	72 min	1.77%	B

Departure window

The best time of day to leave BOS in April

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 27 points, against 11 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am2,416 flights90.3%
8am–11am2,539 flights87.5%
11am–2pm1,846 flights83.4%
2pm–5pm2,422 flights75.5%
5pm–8pm2,219 flights67.3%
8pm–5am1,184 flights63.4%

Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.

The 8pm–5am window is where this operation falls apart: 63.4% on time, against 90.3% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8am–11am window is the busiest, with 2,539 flights scheduled in it.

Across the week, Saturday is the strongest day at 86.0% on time and Sunday the weakest at 69.6%. 16 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at BOS in April

The choice of carrier is not cosmetic here. United Airlines arrives on time 86.5% of the time; Southwest Airlines manages 75.1%. Sample sizes sit next to every figure, because a two-point gap across 608 flights means less than a ten-point one.

Carriers at BOS in April 2026
Airline	Flights	On time	Avg delay	Cancelled	Grade
JetBlue Airways	3,310	75.8%	56 min	0.00%	B+
Republic Airways	3,083	80.7%	59 min	0.26%	B+
Delta Air Lines	2,299	81.3%	61 min	0.52%	B+
American Airlines	1,481	83.0%	90 min	0.61%	B+
United Airlines	1,063	86.5%	65 min	0.19%	A+
Southwest Airlines	608	75.1%	56 min	0.00%	B+
Spirit Airlinesthin sample	307	57.3%	75 min	1.63%	D
Alaska Airlinesthin sample	161	78.3%	49 min	0.00%	B+
Envoy Airthin sample	147	82.6%	76 min	1.36%	B
Frontier Airlinesthin sample	107	66.3%	46 min	0.93%	C+
Allegiant Airthin sample	60	88.3%	38 min	0.00%	A+

United leads Southwest by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

Route by route

Busiest routes out of BOS in April

Routes from BOS in April 2026
Route	Flights	On time	Avg delay	Cancelled	Grade
BOS to DCA · Washington	783	78.3%	68 min	0.26%	B+
BOS to LGA · New York	642	78.8%	70 min	0.47%	B+
BOS to ORD · Chicago	641	77.1%	76 min	2.18%	B
BOS to MCO · Orlando	520	73.5%	68 min	0.38%	C+
BOS to ATL · Atlanta	445	80.5%	54 min	0.67%	B+
BOS to JFK · New York	440	78.4%	62 min	0.00%	B+
BOS to PHL · Philadelphia	419	76.1%	101 min	0.00%	B+
BOS to SFO · San Francisco	381	69.9%	55 min	0.26%	C+
BOS to FLL · Fort Lauderdale	367	68.3%	57 min	0.27%	C+
BOS to LAX · Los Angelesthin sample	362	78.7%	60 min	0.28%	B+
BOS to EWR · Newarkthin sample	348	84.8%	44 min	0.00%	B+
BOS to CLT · Charlottethin sample	339	90.6%	52 min	0.00%	A+
BOS to MIA · Miamithin sample	334	76.0%	71 min	0.00%	B+
BOS to BWI · Baltimorethin sample	322	80.1%	66 min	0.00%	B+
BOS to TPA · Tampathin sample	303	81.5%	55 min	0.33%	B+
BOS to DFW · Dallas-Fort Worththin sample	302	81.4%	66 min	0.99%	B+
BOS to RSW · Fort Myersthin sample	298	73.6%	50 min	0.34%	C+
BOS to DEN · Denverthin sample	284	84.5%	52 min	0.00%	B+
BOS to RDU · Raleighthin sample	245	83.1%	59 min	0.41%	B+
BOS to BNA · Nashvillethin sample	239	72.0%	54 min	0.00%	C+
BOS to PBI · West Palm Beachthin sample	236	71.5%	49 min	0.00%	C+
BOS to PHX · Phoenixthin sample	211	80.6%	38 min	0.00%	B+
BOS to DTW · Detroitthin sample	203	80.7%	70 min	0.49%	B+
BOS to SJU · San Juanthin sample	187	72.0%	74 min	0.53%	C+
BOS to CVG · Cincinnatithin sample	175	83.3%	54 min	0.57%	B+

Delay causes

What held BOS up in April

One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 161,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
43%
Carrier
29%
National Airspace System
27%
Extreme weather
1%
Security
0%

43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 161,000 reported delay minutes here, that single category outweighs weather by 32 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 161,112 reported delay minutes.

Cancellations are rare at 0.31%, below the national 0.90% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

6.7% of arrivals land an hour or more late, close to the national 6.4%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

What to do with this

Flying from BOS in April

For a April trip through BOS: this is one of the better months to be flying from here, 79.3% on time with 0.31% cancelled. That is a base rate for the month as a whole; a single storm can still spoil a particular day.

Boston Logan International (BOS), the whole year
BOS in July70.9%
BOS in August81.4%
BOS in September75.7%
BOS in October73.9%
BOS in November78.0%
BOS in December68.7%
BOS in January73.6%
BOS in February74.8%
BOS in March74.1%
BOS in May79.4%
BOS in June76.6%

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures