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4,341 km · Domestic

Boston Logan (BOS) – San Francisco (SFO)

In July 2026, 986 flights operated between Boston Logan and San Francisco (both directions), and 66.1% 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
January610595▼ 2.5%
February529522▼ 1.3%
March654645▼ 1.4%
April737760▲ 3.1%
May864878▲ 1.6%
June876995▲ 13.6%
July898986▲ 9.8%
August860––
September816––
October851–in progress
November702––
December708––
Year to date (Jan–Jul)5,1685,381▲ 4.1%

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
January87.5%76.8%▼ 12.2%
February77.9%81.6%▲ 4.7%
March83.6%80.9%▼ 3.2%
April88.9%76.2%▼ 14.3%
May81.1%76.2%▼ 6.0%
June81.3%67.8%▼ 16.6%
July76.4%66.1%▼ 13.5%
August83.6%––
September75.0%––
October70.7%–in progress
November79.9%––
December73.6%––
Year-to-date average (Jan–Jul)82.4%75.1%▼ 8.9%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January231▲ 1,450.0%
February643▲ 616.7%
March01–
April02–
May10▼ 100.0%
June09–
July232▲ 1,500.0%
August2––
September0––
October6–in progress
November19––
December5––
Year to date (Jan–Jul)11118▲ 972.7%

Airlines on this route

  1. United Airlines 39.7%
  2. JetBlue Airways 35.8%
  3. Delta Air Lines 18.9%
  4. Alaska Airlines 5.6%
  5. Southwest Airlines 0.0%

Oct 1, 2024 – Jul 31, 2026

By direction

BOS → SFO

Scheduled flights
8,332
Flights operated
8,253
Cancelled
79 · 0.9%
On-time departures
77.1%

SFO → BOS

Scheduled flights
8,330
Flights operated
8,244
Cancelled
86 · 1.0%
On-time departures
79.3%

BOS → SFO and SFO → BOS counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
United Airlines UA 6,615 39.7% 79.9% 53
JetBlue Airways B6 5,967 35.8% 77.0% 80
Delta Air Lines DL 3,147 18.9% 77.3% 30
Alaska Airlines AS 931 5.6% 77.0% 2
Southwest Airlines WN 2 0.0% 50.0% 0

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 delay06:00–07:000.2min · 1,171 recorded · 1,163 measured
Gap to highest-delay hour34.7min06:00 ↔ 19:00
Recorded flights16,662BOS–SFO

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · Fewer than 200 measured departures · 95 recorded · 95 measured · Source: the US BTS 06:00 · 92.8% · 1,171 recorded · 1,163 measured · Source: the US BTS 07:00 · 89.1% · 2,470 recorded · 2,442 measured · Source: the US BTS 08:00 · 87.3% · 1,549 recorded · 1,536 measured · Source: the US BTS 09:00 · 74.8% · 337 recorded · 337 measured · Source: the US BTS 10:00 · 75.6% · 1,052 recorded · 1,047 measured · Source: the US BTS 11:00 · 74.3% · 1,105 recorded · 1,097 measured · Source: the US BTS 12:00 · 71.4% · 585 recorded · 573 measured · Source: the US BTS 13:00 · 76.2% · 1,343 recorded · 1,331 measured · Source: the US BTS 14:00 · 81.4% · 388 recorded · 387 measured · Source: the US BTS 15:00 · 75.0% · 935 recorded · 918 measured · Source: the US BTS 16:00 · 69.2% · 606 recorded · 600 measured · Source: the US BTS 17:00 · 72.8% · 854 recorded · 843 measured · Source: the US BTS 18:00 · 65.9% · 724 recorded · 718 measured · Source: the US BTS 19:00 · 58.3% · 300 recorded · 297 measured · Source: the US BTS 20:00 · 67.1% · 1,200 recorded · 1,182 measured · Source: the US BTS 21:00 · 74.9% · 855 recorded · 848 measured · Source: the US BTS 22:00 · 72.9% · 268 recorded · 266 measured · Source: the US BTS 23:00 · 78.1% · 825 recorded · 817 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 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · Fewer than 200 measured departures · 95 recorded · 95 measured · Source: the US BTS 06:00 · 0.2 min · 1,171 recorded · 1,163 measured · Source: the US BTS 07:00 · 5.2 min · 2,470 recorded · 2,442 measured · Source: the US BTS 08:00 · 6.9 min · 1,549 recorded · 1,536 measured · Source: the US BTS 09:00 · 13.1 min · 337 recorded · 337 measured · Source: the US BTS 10:00 · 15.0 min · 1,052 recorded · 1,047 measured · Source: the US BTS 11:00 · 19.0 min · 1,105 recorded · 1,097 measured · Source: the US BTS 12:00 · 19.9 min · 585 recorded · 573 measured · Source: the US BTS 13:00 · 17.1 min · 1,343 recorded · 1,331 measured · Source: the US BTS 14:00 · 10.0 min · 388 recorded · 387 measured · Source: the US BTS 15:00 · 15.2 min · 935 recorded · 918 measured · Source: the US BTS 16:00 · 21.4 min · 606 recorded · 600 measured · Source: the US BTS 17:00 · 19.9 min · 854 recorded · 843 measured · Source: the US BTS 18:00 · 25.5 min · 724 recorded · 718 measured · Source: the US BTS 19:00 · 34.8 min · 300 recorded · 297 measured · Source: the US BTS 20:00 · 23.1 min · 1,200 recorded · 1,182 measured · Source: the US BTS 21:00 · 15.4 min · 855 recorded · 848 measured · Source: the US BTS 22:00 · 14.6 min · 268 recorded · 266 measured · Source: the US BTS 23:00 · 13.4 min · 825 recorded · 817 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 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 95 · 95 recorded · 95 measured · Source: the US BTS 06:00 · 1,171 · 1,171 recorded · 1,163 measured · Source: the US BTS 07:00 · 2,470 · 2,470 recorded · 2,442 measured · Source: the US BTS 08:00 · 1,549 · 1,549 recorded · 1,536 measured · Source: the US BTS 09:00 · 337 · 337 recorded · 337 measured · Source: the US BTS 10:00 · 1,052 · 1,052 recorded · 1,047 measured · Source: the US BTS 11:00 · 1,105 · 1,105 recorded · 1,097 measured · Source: the US BTS 12:00 · 585 · 585 recorded · 573 measured · Source: the US BTS 13:00 · 1,343 · 1,343 recorded · 1,331 measured · Source: the US BTS 14:00 · 388 · 388 recorded · 387 measured · Source: the US BTS 15:00 · 935 · 935 recorded · 918 measured · Source: the US BTS 16:00 · 606 · 606 recorded · 600 measured · Source: the US BTS 17:00 · 854 · 854 recorded · 843 measured · Source: the US BTS 18:00 · 724 · 724 recorded · 718 measured · Source: the US BTS 19:00 · 300 · 300 recorded · 297 measured · Source: the US BTS 20:00 · 1,200 · 1,200 recorded · 1,182 measured · Source: the US BTS 21:00 · 855 · 855 recorded · 848 measured · Source: the US BTS 22:00 · 268 · 268 recorded · 266 measured · Source: the US BTS 23:00 · 825 · 825 recorded · 817 measured · Source: the US BTS

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View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00No observations———
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:00Fewer than 200 measured departures—9595
06:0092.8%0.2 min1,1631,171
07:0089.1%5.2 min2,4422,470
08:0087.3%6.9 min1,5361,549
09:0074.8%13.1 min337337
10:0075.6%15.0 min1,0471,052
11:0074.3%19.0 min1,0971,105
12:0071.4%19.9 min573585
13:0076.2%17.1 min1,3311,343
14:0081.4%10.0 min387388
15:0075.0%15.2 min918935
16:0069.2%21.4 min600606
17:0072.8%19.9 min843854
18:0065.9%25.5 min718724
19:0058.3%34.8 min297300
20:0067.1%23.1 min1,1821,200
21:0074.9%15.4 min848855
22:0072.9%14.6 min266268
23:0078.1%13.4 min817825

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 75.4% · 2,521 recorded · 2,471 measured · Source: the US BTS Tuesday · 82.6% · 2,316 recorded · 2,292 measured · Source: the US BTS Wednesday · 81.7% · 2,335 recorded · 2,325 measured · Source: the US BTS Thursday · 73.5% · 2,500 recorded · 2,489 measured · Source: the US BTS Friday · 76.8% · 2,527 recorded · 2,515 measured · Source: the US BTS Saturday · 81.5% · 1,981 recorded · 1,970 measured · Source: the US BTS Sunday · 77.3% · 2,482 recorded · 2,435 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
Monday · 16.1 min · 2,521 recorded · 2,471 measured · Source: the US BTS Tuesday · 11.8 min · 2,316 recorded · 2,292 measured · Source: the US BTS Wednesday · 11.0 min · 2,335 recorded · 2,325 measured · Source: the US BTS Thursday · 18.0 min · 2,500 recorded · 2,489 measured · Source: the US BTS Friday · 13.6 min · 2,527 recorded · 2,515 measured · Source: the US BTS Saturday · 11.4 min · 1,981 recorded · 1,970 measured · Source: the US BTS Sunday · 14.8 min · 2,482 recorded · 2,435 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 · 2,521 · 2,521 recorded · 2,471 measured · Source: the US BTS Tuesday · 2,316 · 2,316 recorded · 2,292 measured · Source: the US BTS Wednesday · 2,335 · 2,335 recorded · 2,325 measured · Source: the US BTS Thursday · 2,500 · 2,500 recorded · 2,489 measured · Source: the US BTS Friday · 2,527 · 2,527 recorded · 2,515 measured · Source: the US BTS Saturday · 1,981 · 1,981 recorded · 1,970 measured · Source: the US BTS Sunday · 2,482 · 2,482 recorded · 2,435 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday75.4%16.1 min2,4712,521
Tuesday82.6%11.8 min2,2922,316
Wednesday81.7%11.0 min2,3252,335
Thursday73.5%18.0 min2,4892,500
Friday76.8%13.6 min2,5152,527
Saturday81.5%11.4 min1,9701,981
Sunday77.3%14.8 min2,4352,482

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 · 82.2% · 1,238 recorded · 1,205 measured · Source: the US BTS Feb · 79.7% · 1,100 recorded · 1,051 measured · Source: the US BTS Mar · 82.3% · 1,300 recorded · 1,299 measured · Source: the US BTS Apr · 82.4% · 1,499 recorded · 1,497 measured · Source: the US BTS May · 78.7% · 1,743 recorded · 1,742 measured · Source: the US BTS Jun · 74.1% · 1,880 recorded · 1,871 measured · Source: the US BTS Jul · 71.0% · 1,918 recorded · 1,884 measured · Source: the US BTS Aug · 83.6% · 862 recorded · 860 measured · Source: the US BTS Sep · 75.0% · 816 recorded · 816 measured · Source: the US BTS Oct · 78.6% · 1,396 recorded · 1,390 measured · Source: the US BTS Nov · 80.9% · 1,445 recorded · 1,426 measured · Source: the US BTS Dec · 75.6% · 1,465 recorded · 1,456 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
Jan · 9.8 min · 1,238 recorded · 1,205 measured · Source: the US BTS Feb · 15.3 min · 1,100 recorded · 1,051 measured · Source: the US BTS Mar · 13.2 min · 1,300 recorded · 1,299 measured · Source: the US BTS Apr · 7.9 min · 1,499 recorded · 1,497 measured · Source: the US BTS May · 11.0 min · 1,743 recorded · 1,742 measured · Source: the US BTS Jun · 16.1 min · 1,880 recorded · 1,871 measured · Source: the US BTS Jul · 20.7 min · 1,918 recorded · 1,884 measured · Source: the US BTS Aug · 9.2 min · 862 recorded · 860 measured · Source: the US BTS Sep · 18.0 min · 816 recorded · 816 measured · Source: the US BTS Oct · 15.9 min · 1,396 recorded · 1,390 measured · Source: the US BTS Nov · 11.1 min · 1,445 recorded · 1,426 measured · Source: the US BTS Dec · 16.6 min · 1,465 recorded · 1,456 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 · 1,238 · 1,238 recorded · 1,205 measured · Source: the US BTS Feb · 1,100 · 1,100 recorded · 1,051 measured · Source: the US BTS Mar · 1,300 · 1,300 recorded · 1,299 measured · Source: the US BTS Apr · 1,499 · 1,499 recorded · 1,497 measured · Source: the US BTS May · 1,743 · 1,743 recorded · 1,742 measured · Source: the US BTS Jun · 1,880 · 1,880 recorded · 1,871 measured · Source: the US BTS Jul · 1,918 · 1,918 recorded · 1,884 measured · Source: the US BTS Aug · 862 · 862 recorded · 860 measured · Source: the US BTS Sep · 816 · 816 recorded · 816 measured · Source: the US BTS Oct · 1,396 · 1,396 recorded · 1,390 measured · Source: the US BTS Nov · 1,445 · 1,445 recorded · 1,426 measured · Source: the US BTS Dec · 1,465 · 1,465 recorded · 1,456 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan82.2%9.8 min1,2051,238
Feb79.7%15.3 min1,0511,100
Mar82.3%13.2 min1,2991,300
Apr82.4%7.9 min1,4971,499
May78.7%11.0 min1,7421,743
Jun74.1%16.1 min1,8711,880
Jul71.0%20.7 min1,8841,918
Aug83.6%9.2 min860862
Sep75.0%18.0 min816816
Oct78.6%15.9 min1,3901,396
Nov80.9%11.1 min1,4261,445
Dec75.6%16.6 min1,4561,465

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 77.4% 12,904
  • Delayed >15 min 21.6% 3,593
  • Cancelled 1.0% 165
  • 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

81
81 of 81
Flight numbersBy direction DeparturesOn time
DL400 SFO → BOS 657 94.6%
B661734 SFO → BOS 627 77.0%
B66434 SFO → BOS 609 90.8%
B66734 SFO → BOS 605 78.0%
UA2647 SFO → BOS 595 85.0%
B66733 BOS → SFO 588 69.1%
B66333 BOS → SFO 584 67.0%
UA1665 SFO → BOS 578 82.7%
UA2400 BOS → SFO 565 64.3%
UA1008 BOS → SFO 506 88.0%
UA2441 BOS → SFO 503 94.0%
DL1655 BOS → SFO 445 73.6%
UA1372 SFO → BOS 428 75.5%
DL977 BOS → SFO 424 84.5%
DL977 SFO → BOS 410 70.4%
B66133 BOS → SFO 376 89.9%
UA2356 SFO → BOS 364 62.6%
DL475 BOS → SFO 360 66.8%
B661833 BOS → SFO 334 85.6%
UA1074 BOS → SFO 329 76.5%
B66233 BOS → SFO 298 74.2%
B661333 BOS → SFO 279 89.2%
AS356 SFO → BOS 255 94.1%
B662233 BOS → SFO 255 82.1%
B66334 SFO → BOS 246 79.3%
B66134 SFO → BOS 241 67.8%
UA796 SFO → BOS 239 81.9%
DL1655 SFO → BOS 231 66.2%
B66834 SFO → BOS 216 67.6%
AS357 BOS → SFO 200 71.0%
UA1187 BOS → SFO 197 81.2%
DL362 BOS → SFO 195 83.0%
DL362 SFO → BOS 192 70.2%
UA2259 SFO → BOS 154 72.7%
UA2279 BOS → SFO 144 84.3%
UA1413 BOS → SFO 126 89.7%
UA1482 BOS → SFO 110 93.6%
UA2001 SFO → BOS 94 81.9%
UA354 SFO → BOS 92 80.4%
B661034 SFO → BOS 91 52.8%
B661634 SFO → BOS 88 68.6%
B661633 BOS → SFO 84 44.4%
UA2107 BOS → SFO 84 58.5%
UA1367 BOS → SFO 82 84.0%
UA1015 SFO → BOS 81 96.3%
UA2002 BOS → SFO 72 61.1%
AS308 BOS → SFO 69 71.0%
AS249 SFO → BOS 68 83.6%
AS307 SFO → BOS 68 72.1%
AS355 BOS → SFO 68 48.5%
DL2919 BOS → SFO 67 71.2%
B66534 SFO → BOS 66 89.4%
UA1702 SFO → BOS 60 83.3%
UA2851 SFO → BOS 58 89.7%
UA366 BOS → SFO 58 84.5%
UA1434 BOS → SFO 56 85.7%
UA2623 BOS → SFO 56 85.7%
UA2136 SFO → BOS 55 90.9%
B661534 SFO → BOS 54 64.2%
DL860 BOS → SFO 54 48.2%
B66833 BOS → SFO 48 87.5%
UA2488 SFO → BOS 47 93.6%
AS249 BOS → SFO 45 66.7%
AS425 SFO → BOS 45 88.9%
UA289 BOS → SFO 45 86.7%
DL860 SFO → BOS 42 47.6%
B66933 BOS → SFO 41 73.2%
B66934 SFO → BOS 40 85.0%
UA2256 SFO → BOS 37 83.3%
UA2495 SFO → BOS 37 78.4%
UA323 BOS → SFO 37 89.2%
UA390 BOS → SFO 37 83.8%
UA512 BOS → SFO 37 69.4%
UA2124 SFO → BOS 36 83.3%
B66413 BOS → SFO 35 32.3%
UA1116 SFO → BOS 35 71.4%
UA431 SFO → BOS 35 74.3%
UA440 BOS → SFO 35 51.4%
UA2011 BOS → SFO 32 84.4%
UA1176 SFO → BOS 30 90.0%
UA2697 SFO → BOS 30 83.3%

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 986 +9.8% 32 66.1%
June 2026 995 +13.6% 9 67.8%
May 2026 878 +1.6% 0 76.2%
April 2026 760 +3.1% 2 76.2%
March 2026 645 −1.4% 1 80.9%
February 2026 522 −1.3% 43 81.6%
January 2026 595 −2.5% 31 76.8%
December 2025 708 −5.3% 5 73.6%
November 2025 702 −3.0% 19 79.9%
October 2025 851 +57.9% 6 70.7%
September 2025 816 0 75.0%
August 2025 860 2 83.6%
July 2025 898 2 76.4%
June 2025 876 0 81.3%
May 2025 864 1 81.1%
April 2025 737 0 88.9%
March 2025 654 0 83.6%
February 2025 529 6 77.9%
January 2025 610 2 87.5%
December 2024 748 4 77.5%
November 2024 724 0 81.8%
October 2024 539 0 90.9%

How to read this chart

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