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2,702 km · International

Boston Logan (BOS) – Luis Munoz Marin (SJU)

In July 2026, 246 flights operated between Boston Logan and Luis Munoz Marin (both directions), and 65.4% left on time, according to the US BTS.

Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT

Flights per month

Only complete months are shown. A month appears once the source has published every day of it.

The most recent periods19 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January370335▼ 9.5%
February385358▼ 7.0%
March439428▼ 2.5%
April406401▼ 1.2%
May307285▼ 7.2%
June323262▼ 18.9%
July344246▼ 28.5%
August363––
September167––
October191–in progress
November227––
December355––
Year to date (Jan–Jul)2,5742,315▼ 10.1%

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods19 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January74.3%63.9%▼ 14.0%
February73.5%67.6%▼ 8.0%
March74.7%73.6%▼ 1.5%
April77.8%77.3%▼ 0.6%
May78.8%84.2%▲ 6.9%
June79.3%80.5%▲ 1.5%
July73.5%65.4%▼ 11.0%
August75.8%––
September80.2%––
October81.2%–in progress
November77.1%––
December63.4%––
Year-to-date average (Jan–Jul)76.0%73.2%▼ 3.6%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January742▲ 500.0%
February527▲ 440.0%
March511▲ 120.0%
April01–
May00–
June00–
July1019▲ 90.0%
August4––
September0––
October2–in progress
November3––
December4––
Year to date (Jan–Jul)27100▲ 270.4%

Airlines on this route

  1. JetBlue Airways 68.5%
  2. Delta Air Lines 20.1%
  3. Spirit Airlines 6.8%
  4. Frontier Airlines 4.6%

Oct 1, 2024 – Jul 31, 2026

By direction

BOS → SJU

Scheduled flights
3,440
Flights operated
3,375
Cancelled
65 · 1.9%
On-time departures
72.6%

SJU → BOS

Scheduled flights
3,757
Flights operated
3,679
Cancelled
78 · 2.1%
On-time departures
75.8%

BOS → SJU and SJU → BOS counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
JetBlue Airways B6 4,927 68.5% 72.8% 99
Delta Air Lines DL 1,450 20.1% 82.1% 16
Spirit Airlines NK 489 6.8% 67.4% 20
Frontier Airlines F9 331 4.6% 71.2% 8

Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.

Flight timing & delays

Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.

Times are local to the departure airport of each flight; both directions are combined.

US domestic sectors recorded by BTS

Source: the US BTS · Oct 12, 2024 → Jul 31, 2026

Lowest average delay05:00–06:000.3min · 276 recorded · 269 measured
Gap to highest-delay hour36.7min05:00 ↔ 20:00
Recorded flights7,197BOS–SJU

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · Fewer than 200 measured departures · 31 recorded · 31 measured · Source: the US BTS 01:00 · Fewer than 200 measured departures · 2 recorded · 2 measured · Source: the US BTS 02:00 · Fewer than 200 measured departures · 42 recorded · 41 measured · Source: the US BTS 03:00 · Fewer than 200 measured departures · 15 recorded · 15 measured · Source: the US BTS 04:00 · Fewer than 200 measured departures · 4 recorded · 4 measured · Source: the US BTS 05:00 · 92.2% · 276 recorded · 269 measured · Source: the US BTS 06:00 · 87.6% · 505 recorded · 493 measured · Source: the US BTS 07:00 · 86.8% · 314 recorded · 310 measured · Source: the US BTS 08:00 · 85.4% · 1,070 recorded · 1,064 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 145 recorded · 143 measured · Source: the US BTS 10:00 · 76.3% · 431 recorded · 421 measured · Source: the US BTS 11:00 · 68.9% · 278 recorded · 273 measured · Source: the US BTS 12:00 · 70.6% · 541 recorded · 534 measured · Source: the US BTS 13:00 · 75.5% · 726 recorded · 719 measured · Source: the US BTS 14:00 · 75.3% · 652 recorded · 640 measured · Source: the US BTS 15:00 · 64.3% · 477 recorded · 456 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 171 recorded · 168 measured · Source: the US BTS 17:00 · 61.5% · 283 recorded · 273 measured · Source: the US BTS 18:00 · 61.8% · 313 recorded · 304 measured · Source: the US BTS 19:00 · 61.7% · 355 recorded · 345 measured · Source: the US BTS 20:00 · 54.1% · 330 recorded · 316 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 118 recorded · 117 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 100 recorded · 98 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 18 recorded · 18 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
00:00 · Fewer than 200 measured departures · 31 recorded · 31 measured · Source: the US BTS 01:00 · Fewer than 200 measured departures · 2 recorded · 2 measured · Source: the US BTS 02:00 · Fewer than 200 measured departures · 42 recorded · 41 measured · Source: the US BTS 03:00 · Fewer than 200 measured departures · 15 recorded · 15 measured · Source: the US BTS 04:00 · Fewer than 200 measured departures · 4 recorded · 4 measured · Source: the US BTS 05:00 · 0.3 min · 276 recorded · 269 measured · Source: the US BTS 06:00 · 6.6 min · 505 recorded · 493 measured · Source: the US BTS 07:00 · 8.0 min · 314 recorded · 310 measured · Source: the US BTS 08:00 · 7.2 min · 1,070 recorded · 1,064 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 145 recorded · 143 measured · Source: the US BTS 10:00 · 23.6 min · 431 recorded · 421 measured · Source: the US BTS 11:00 · 35.4 min · 278 recorded · 273 measured · Source: the US BTS 12:00 · 22.0 min · 541 recorded · 534 measured · Source: the US BTS 13:00 · 13.3 min · 726 recorded · 719 measured · Source: the US BTS 14:00 · 17.2 min · 652 recorded · 640 measured · Source: the US BTS 15:00 · 30.7 min · 477 recorded · 456 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 171 recorded · 168 measured · Source: the US BTS 17:00 · 27.5 min · 283 recorded · 273 measured · Source: the US BTS 18:00 · 24.8 min · 313 recorded · 304 measured · Source: the US BTS 19:00 · 28.8 min · 355 recorded · 345 measured · Source: the US BTS 20:00 · 37.1 min · 330 recorded · 316 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 118 recorded · 117 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 100 recorded · 98 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 18 recorded · 18 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
00:00 · 31 · 31 recorded · 31 measured · Source: the US BTS 01:00 · 2 · 2 recorded · 2 measured · Source: the US BTS 02:00 · 42 · 42 recorded · 41 measured · Source: the US BTS 03:00 · 15 · 15 recorded · 15 measured · Source: the US BTS 04:00 · 4 · 4 recorded · 4 measured · Source: the US BTS 05:00 · 276 · 276 recorded · 269 measured · Source: the US BTS 06:00 · 505 · 505 recorded · 493 measured · Source: the US BTS 07:00 · 314 · 314 recorded · 310 measured · Source: the US BTS 08:00 · 1,070 · 1,070 recorded · 1,064 measured · Source: the US BTS 09:00 · 145 · 145 recorded · 143 measured · Source: the US BTS 10:00 · 431 · 431 recorded · 421 measured · Source: the US BTS 11:00 · 278 · 278 recorded · 273 measured · Source: the US BTS 12:00 · 541 · 541 recorded · 534 measured · Source: the US BTS 13:00 · 726 · 726 recorded · 719 measured · Source: the US BTS 14:00 · 652 · 652 recorded · 640 measured · Source: the US BTS 15:00 · 477 · 477 recorded · 456 measured · Source: the US BTS 16:00 · 171 · 171 recorded · 168 measured · Source: the US BTS 17:00 · 283 · 283 recorded · 273 measured · Source: the US BTS 18:00 · 313 · 313 recorded · 304 measured · Source: the US BTS 19:00 · 355 · 355 recorded · 345 measured · Source: the US BTS 20:00 · 330 · 330 recorded · 316 measured · Source: the US BTS 21:00 · 118 · 118 recorded · 117 measured · Source: the US BTS 22:00 · 100 · 100 recorded · 98 measured · Source: the US BTS 23:00 · 18 · 18 recorded · 18 measured · Source: the US BTS

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View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00Fewer than 200 measured departures—3131
01:00Fewer than 200 measured departures—22
02:00Fewer than 200 measured departures—4142
03:00Fewer than 200 measured departures—1515
04:00Fewer than 200 measured departures—44
05:0092.2%0.3 min269276
06:0087.6%6.6 min493505
07:0086.8%8.0 min310314
08:0085.4%7.2 min1,0641,070
09:00Fewer than 200 measured departures—143145
10:0076.3%23.6 min421431
11:0068.9%35.4 min273278
12:0070.6%22.0 min534541
13:0075.5%13.3 min719726
14:0075.3%17.2 min640652
15:0064.3%30.7 min456477
16:00Fewer than 200 measured departures—168171
17:0061.5%27.5 min273283
18:0061.8%24.8 min304313
19:0061.7%28.8 min345355
20:0054.1%37.1 min316330
21:00Fewer than 200 measured departures—117118
22:00Fewer than 200 measured departures—98100
23:00Fewer than 200 measured departures—1818

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 72.4% · 1,039 recorded · 1,005 measured · Source: the US BTS Tuesday · 79.4% · 942 recorded · 929 measured · Source: the US BTS Wednesday · 77.9% · 910 recorded · 900 measured · Source: the US BTS Thursday · 73.8% · 1,066 recorded · 1,055 measured · Source: the US BTS Friday · 76.7% · 1,036 recorded · 1,028 measured · Source: the US BTS Saturday · 71.0% · 1,136 recorded · 1,105 measured · Source: the US BTS Sunday · 69.6% · 1,068 recorded · 1,032 measured · Source: the US BTS

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Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 23.0 min · 1,039 recorded · 1,005 measured · Source: the US BTS Tuesday · 14.7 min · 942 recorded · 929 measured · Source: the US BTS Wednesday · 12.1 min · 910 recorded · 900 measured · Source: the US BTS Thursday · 16.8 min · 1,066 recorded · 1,055 measured · Source: the US BTS Friday · 16.1 min · 1,036 recorded · 1,028 measured · Source: the US BTS Saturday · 20.5 min · 1,136 recorded · 1,105 measured · Source: the US BTS Sunday · 24.8 min · 1,068 recorded · 1,032 measured · Source: the US BTS

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Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 1,039 · 1,039 recorded · 1,005 measured · Source: the US BTS Tuesday · 942 · 942 recorded · 929 measured · Source: the US BTS Wednesday · 910 · 910 recorded · 900 measured · Source: the US BTS Thursday · 1,066 · 1,066 recorded · 1,055 measured · Source: the US BTS Friday · 1,036 · 1,036 recorded · 1,028 measured · Source: the US BTS Saturday · 1,136 · 1,136 recorded · 1,105 measured · Source: the US BTS Sunday · 1,068 · 1,068 recorded · 1,032 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday72.4%23.0 min1,0051,039
Tuesday79.4%14.7 min929942
Wednesday77.9%12.1 min900910
Thursday73.8%16.8 min1,0551,066
Friday76.7%16.1 min1,0281,036
Saturday71.0%20.5 min1,1051,136
Sunday69.6%24.8 min1,0321,068

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Jan · 69.4% · 754 recorded · 705 measured · Source: the US BTS Feb · 70.7% · 775 recorded · 743 measured · Source: the US BTS Mar · 74.2% · 883 recorded · 867 measured · Source: the US BTS Apr · 77.6% · 808 recorded · 807 measured · Source: the US BTS May · 81.4% · 592 recorded · 592 measured · Source: the US BTS Jun · 79.8% · 585 recorded · 585 measured · Source: the US BTS Jul · 70.2% · 619 recorded · 590 measured · Source: the US BTS Aug · 75.8% · 367 recorded · 363 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 167 recorded · 167 measured · Source: the US BTS Oct · 78.8% · 352 recorded · 349 measured · Source: the US BTS Nov · 77.2% · 543 recorded · 539 measured · Source: the US BTS Dec · 65.7% · 752 recorded · 747 measured · Source: the US BTS

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Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · 25.9 min · 754 recorded · 705 measured · Source: the US BTS Feb · 26.9 min · 775 recorded · 743 measured · Source: the US BTS Mar · 18.6 min · 883 recorded · 867 measured · Source: the US BTS Apr · 12.2 min · 808 recorded · 807 measured · Source: the US BTS May · 12.3 min · 592 recorded · 592 measured · Source: the US BTS Jun · 11.3 min · 585 recorded · 585 measured · Source: the US BTS Jul · 21.7 min · 619 recorded · 590 measured · Source: the US BTS Aug · 17.5 min · 367 recorded · 363 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 167 recorded · 167 measured · Source: the US BTS Oct · 12.8 min · 352 recorded · 349 measured · Source: the US BTS Nov · 13.9 min · 543 recorded · 539 measured · Source: the US BTS Dec · 25.7 min · 752 recorded · 747 measured · Source: the US BTS

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Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 754 · 754 recorded · 705 measured · Source: the US BTS Feb · 775 · 775 recorded · 743 measured · Source: the US BTS Mar · 883 · 883 recorded · 867 measured · Source: the US BTS Apr · 808 · 808 recorded · 807 measured · Source: the US BTS May · 592 · 592 recorded · 592 measured · Source: the US BTS Jun · 585 · 585 recorded · 585 measured · Source: the US BTS Jul · 619 · 619 recorded · 590 measured · Source: the US BTS Aug · 367 · 367 recorded · 363 measured · Source: the US BTS Sep · 167 · 167 recorded · 167 measured · Source: the US BTS Oct · 352 · 352 recorded · 349 measured · Source: the US BTS Nov · 543 · 543 recorded · 539 measured · Source: the US BTS Dec · 752 · 752 recorded · 747 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan69.4%25.9 min705754
Feb70.7%26.9 min743775
Mar74.2%18.6 min867883
Apr77.6%12.2 min807808
May81.4%12.3 min592592
Jun79.8%11.3 min585585
Jul70.2%21.7 min590619
Aug75.8%17.5 min363367
SepFewer than 200 measured departures—167167
Oct78.8%12.8 min349352
Nov77.2%13.9 min539543
Dec65.7%25.7 min747752

Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.

Recorded outcomes

  • On time 72.8% 5,237
  • Delayed >15 min 25.2% 1,817
  • Cancelled 2.0% 143
  • Missing departure time 0.0% 0

All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.

On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.

Flight numbers on this route

34
34 of 34
Flight numbersBy direction DeparturesOn time
DL1780 BOS → SJU 658 83.0%
B66861 BOS → SJU 651 84.4%
DL1780 SJU → BOS 579 82.4%
B66561 BOS → SJU 531 60.6%
B66862 SJU → BOS 488 74.9%
B66562 SJU → BOS 383 82.0%
B661462 SJU → BOS 344 66.4%
B66162 SJU → BOS 295 89.2%
B66261 BOS → SJU 277 69.6%
B66808 SJU → BOS 266 67.6%
B66161 BOS → SJU 253 62.9%
B66462 SJU → BOS 208 57.6%
B66761 BOS → SJU 168 80.3%
B66762 SJU → BOS 166 78.3%
F993002 SJU → BOS 166 87.7%
F993001 BOS → SJU 165 54.4%
NK3012 SJU → BOS 91 83.0%
NK3013 BOS → SJU 91 51.2%
B66661 BOS → SJU 73 78.6%
B661161 BOS → SJU 71 71.8%
B66662 SJU → BOS 69 64.2%
B661226 SJU → BOS 60 65.5%
B661235 BOS → SJU 60 75.0%
B66531 BOS → SJU 53 62.3%
B66908 SJU → BOS 49 67.4%
DL1864 SJU → BOS 46 77.8%
B661561 BOS → SJU 40 77.5%
B661562 SJU → BOS 40 60.0%
B66262 SJU → BOS 38 44.4%
B66732 SJU → BOS 38 89.5%
DL1851 SJU → BOS 35 63.6%
DL1852 BOS → SJU 35 84.9%
B661162 SJU → BOS 33 66.7%
B661351 BOS → SJU 31 51.6%

Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.

Monthly figures
PeriodFlights operated Change vs last yearCancelled On-time departures
July 2026 246 −28.5% 19 65.4%
June 2026 262 −18.9% 0 80.5%
May 2026 285 −7.2% 0 84.2%
April 2026 401 −1.2% 1 77.3%
March 2026 428 −2.5% 11 73.6%
February 2026 358 −7.0% 27 67.6%
January 2026 335 −9.5% 42 63.9%
December 2025 355 −9.4% 4 63.4%
November 2025 227 −27.2% 3 77.1%
October 2025 191 +20.9% 2 81.2%
September 2025 167 0 80.2%
August 2025 363 4 75.8%
July 2025 344 10 73.5%
June 2025 323 0 79.3%
May 2025 307 0 78.8%
April 2025 406 0 77.8%
March 2025 439 5 74.7%
February 2025 385 5 73.5%
January 2025 370 7 74.3%
December 2024 392 1 67.9%
November 2024 312 1 77.2%
October 2024 158 1 75.9%

How to read this chart

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