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1,680 km · Domestic

Boston Logan (BOS) – St. Louis Lambert (STL)

In July 2026, 289 flights operated between Boston Logan and St. Louis Lambert (both directions), and 59.9% 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
January184192▲ 4.3%
February174182▲ 4.6%
March234233▼ 0.4%
April278267▼ 4.0%
May296284▼ 4.1%
June289286▼ 1.0%
July293289▼ 1.4%
August290––
September281––
October298–in progress
November279––
December290––
Year to date (Jan–Jul)1,7481,733▼ 0.9%

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
January84.2%79.7%▼ 5.3%
February82.2%80.8%▼ 1.7%
March85.5%67.4%▼ 21.2%
April84.9%77.2%▼ 9.1%
May78.4%68.3%▼ 12.9%
June70.2%67.8%▼ 3.4%
July69.6%59.9%▼ 13.9%
August79.7%––
September70.1%––
October56.0%–in progress
November78.5%––
December74.1%––
Year-to-date average (Jan–Jul)79.3%71.6%▼ 9.7%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January2012▼ 40.0%
February414▲ 250.0%
March03–
April00–
May20▼ 100.0%
June32▼ 33.3%
July511▲ 120.0%
August0––
September3––
October2–in progress
November3––
December2––
Year to date (Jan–Jul)3442▲ 23.5%

Airlines on this route

  1. Southwest Airlines 58.0%
  2. Envoy Air 25.6%
  3. Republic Airways 16.4%

Oct 1, 2024 – Jul 31, 2026

By direction

BOS → STL

Scheduled flights
2,859
Flights operated
2,813
Cancelled
46 · 1.6%
On-time departures
78.6%

STL → BOS

Scheduled flights
2,860
Flights operated
2,816
Cancelled
44 · 1.5%
On-time departures
71.2%

BOS → STL and STL → BOS counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 3,317 58.0% 70.3% 34
Envoy Air MQ 1,466 25.6% 79.4% 21
Republic Airways YX 936 16.4% 84.4% 35

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 delay06:00–07:00-1.9min · 498 recorded · 483 measured
Gap to highest-delay hour39.0min06:00 ↔ 19:00
Recorded flights5,719BOS–STL

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 · 176 recorded · 176 measured · Source: the US BTS 06:00 · 95.5% · 498 recorded · 483 measured · Source: the US BTS 07:00 · 93.9% · 656 recorded · 650 measured · Source: the US BTS 08:00 · 90.7% · 238 recorded · 237 measured · Source: the US BTS 09:00 · 89.5% · 450 recorded · 439 measured · Source: the US BTS 10:00 · 86.3% · 323 recorded · 321 measured · Source: the US BTS 11:00 · 84.9% · 390 recorded · 383 measured · Source: the US BTS 12:00 · 77.5% · 222 recorded · 218 measured · Source: the US BTS 13:00 · 70.3% · 313 recorded · 313 measured · Source: the US BTS 14:00 · 61.6% · 547 recorded · 539 measured · Source: the US BTS 15:00 · 63.5% · 267 recorded · 263 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 165 recorded · 162 measured · Source: the US BTS 17:00 · 61.3% · 309 recorded · 300 measured · Source: the US BTS 18:00 · 54.3% · 474 recorded · 464 measured · Source: the US BTS 19:00 · 45.1% · 497 recorded · 490 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 185 recorded · 183 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 9 recorded · 8 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 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 · 176 recorded · 176 measured · Source: the US BTS 06:00 · -1.9 min · 498 recorded · 483 measured · Source: the US BTS 07:00 · 2.2 min · 656 recorded · 650 measured · Source: the US BTS 08:00 · 1.9 min · 238 recorded · 237 measured · Source: the US BTS 09:00 · 2.9 min · 450 recorded · 439 measured · Source: the US BTS 10:00 · 7.7 min · 323 recorded · 321 measured · Source: the US BTS 11:00 · 7.4 min · 390 recorded · 383 measured · Source: the US BTS 12:00 · 11.3 min · 222 recorded · 218 measured · Source: the US BTS 13:00 · 16.0 min · 313 recorded · 313 measured · Source: the US BTS 14:00 · 22.4 min · 547 recorded · 539 measured · Source: the US BTS 15:00 · 25.2 min · 267 recorded · 263 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 165 recorded · 162 measured · Source: the US BTS 17:00 · 26.8 min · 309 recorded · 300 measured · Source: the US BTS 18:00 · 30.7 min · 474 recorded · 464 measured · Source: the US BTS 19:00 · 37.1 min · 497 recorded · 490 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 185 recorded · 183 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 9 recorded · 8 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

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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 · 176 · 176 recorded · 176 measured · Source: the US BTS 06:00 · 498 · 498 recorded · 483 measured · Source: the US BTS 07:00 · 656 · 656 recorded · 650 measured · Source: the US BTS 08:00 · 238 · 238 recorded · 237 measured · Source: the US BTS 09:00 · 450 · 450 recorded · 439 measured · Source: the US BTS 10:00 · 323 · 323 recorded · 321 measured · Source: the US BTS 11:00 · 390 · 390 recorded · 383 measured · Source: the US BTS 12:00 · 222 · 222 recorded · 218 measured · Source: the US BTS 13:00 · 313 · 313 recorded · 313 measured · Source: the US BTS 14:00 · 547 · 547 recorded · 539 measured · Source: the US BTS 15:00 · 267 · 267 recorded · 263 measured · Source: the US BTS 16:00 · 165 · 165 recorded · 162 measured · Source: the US BTS 17:00 · 309 · 309 recorded · 300 measured · Source: the US BTS 18:00 · 474 · 474 recorded · 464 measured · Source: the US BTS 19:00 · 497 · 497 recorded · 490 measured · Source: the US BTS 20:00 · 185 · 185 recorded · 183 measured · Source: the US BTS 21:00 · 9 · 9 recorded · 8 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 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—176176
06:0095.5%-1.9 min483498
07:0093.9%2.2 min650656
08:0090.7%1.9 min237238
09:0089.5%2.9 min439450
10:0086.3%7.7 min321323
11:0084.9%7.4 min383390
12:0077.5%11.3 min218222
13:0070.3%16.0 min313313
14:0061.6%22.4 min539547
15:0063.5%25.2 min263267
16:00Fewer than 200 measured departures—162165
17:0061.3%26.8 min300309
18:0054.3%30.7 min464474
19:0045.1%37.1 min490497
20:00Fewer than 200 measured departures—183185
21:00Fewer than 200 measured departures—89
22:00No observations———
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 73.4% · 865 recorded · 839 measured · Source: the US BTS Tuesday · 80.0% · 817 recorded · 806 measured · Source: the US BTS Wednesday · 77.1% · 815 recorded · 811 measured · Source: the US BTS Thursday · 69.9% · 850 recorded · 841 measured · Source: the US BTS Friday · 74.7% · 857 recorded · 853 measured · Source: the US BTS Saturday · 79.9% · 643 recorded · 638 measured · Source: the US BTS Sunday · 70.6% · 872 recorded · 841 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 · 18.3 min · 865 recorded · 839 measured · Source: the US BTS Tuesday · 11.3 min · 817 recorded · 806 measured · Source: the US BTS Wednesday · 11.3 min · 815 recorded · 811 measured · Source: the US BTS Thursday · 17.4 min · 850 recorded · 841 measured · Source: the US BTS Friday · 13.5 min · 857 recorded · 853 measured · Source: the US BTS Saturday · 9.4 min · 643 recorded · 638 measured · Source: the US BTS Sunday · 20.0 min · 872 recorded · 841 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 · 865 · 865 recorded · 839 measured · Source: the US BTS Tuesday · 817 · 817 recorded · 806 measured · Source: the US BTS Wednesday · 815 · 815 recorded · 811 measured · Source: the US BTS Thursday · 850 · 850 recorded · 841 measured · Source: the US BTS Friday · 857 · 857 recorded · 853 measured · Source: the US BTS Saturday · 643 · 643 recorded · 638 measured · Source: the US BTS Sunday · 872 · 872 recorded · 841 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday73.4%18.3 min839865
Tuesday80.0%11.3 min806817
Wednesday77.1%11.3 min811815
Thursday69.9%17.4 min841850
Friday74.7%13.5 min853857
Saturday79.9%9.4 min638643
Sunday70.6%20.0 min841872

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 · 81.9% · 408 recorded · 376 measured · Source: the US BTS Feb · 81.5% · 374 recorded · 356 measured · Source: the US BTS Mar · 76.5% · 470 recorded · 467 measured · Source: the US BTS Apr · 81.1% · 545 recorded · 545 measured · Source: the US BTS May · 73.5% · 582 recorded · 580 measured · Source: the US BTS Jun · 69.0% · 580 recorded · 575 measured · Source: the US BTS Jul · 64.8% · 598 recorded · 582 measured · Source: the US BTS Aug · 79.7% · 290 recorded · 290 measured · Source: the US BTS Sep · 70.1% · 284 recorded · 281 measured · Source: the US BTS Oct · 65.4% · 490 recorded · 488 measured · Source: the US BTS Nov · 81.7% · 544 recorded · 541 measured · Source: the US BTS Dec · 78.3% · 554 recorded · 548 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 · 4.7 min · 408 recorded · 376 measured · Source: the US BTS Feb · 10.1 min · 374 recorded · 356 measured · Source: the US BTS Mar · 12.1 min · 470 recorded · 467 measured · Source: the US BTS Apr · 9.1 min · 545 recorded · 545 measured · Source: the US BTS May · 16.1 min · 582 recorded · 580 measured · Source: the US BTS Jun · 21.9 min · 580 recorded · 575 measured · Source: the US BTS Jul · 25.0 min · 598 recorded · 582 measured · Source: the US BTS Aug · 11.8 min · 290 recorded · 290 measured · Source: the US BTS Sep · 18.7 min · 284 recorded · 281 measured · Source: the US BTS Oct · 21.1 min · 490 recorded · 488 measured · Source: the US BTS Nov · 9.7 min · 544 recorded · 541 measured · Source: the US BTS Dec · 10.7 min · 554 recorded · 548 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
Jan · 408 · 408 recorded · 376 measured · Source: the US BTS Feb · 374 · 374 recorded · 356 measured · Source: the US BTS Mar · 470 · 470 recorded · 467 measured · Source: the US BTS Apr · 545 · 545 recorded · 545 measured · Source: the US BTS May · 582 · 582 recorded · 580 measured · Source: the US BTS Jun · 580 · 580 recorded · 575 measured · Source: the US BTS Jul · 598 · 598 recorded · 582 measured · Source: the US BTS Aug · 290 · 290 recorded · 290 measured · Source: the US BTS Sep · 284 · 284 recorded · 281 measured · Source: the US BTS Oct · 490 · 490 recorded · 488 measured · Source: the US BTS Nov · 544 · 544 recorded · 541 measured · Source: the US BTS Dec · 554 · 554 recorded · 548 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan81.9%4.7 min376408
Feb81.5%10.1 min356374
Mar76.5%12.1 min467470
Apr81.1%9.1 min545545
May73.5%16.1 min580582
Jun69.0%21.9 min575580
Jul64.8%25.0 min582598
Aug79.7%11.8 min290290
Sep70.1%18.7 min281284
Oct65.4%21.1 min488490
Nov81.7%9.7 min541544
Dec78.3%10.7 min548554

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 73.7% 4,215
  • Delayed >15 min 24.7% 1,414
  • Cancelled 1.6% 90
  • 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

77
77 of 77
Flight numbersBy direction DeparturesOn time
MQ3416 STL → BOS 230 72.0%
MQ3563 STL → BOS 145 89.0%
WN1441 BOS → STL 139 76.3%
MQ3416 BOS → STL 134 86.3%
YX4493 STL → BOS 128 85.4%
WN936 BOS → STL 123 96.7%
MQ3562 STL → BOS 122 57.5%
MQ3562 BOS → STL 122 61.7%
MQ3381 BOS → STL 118 95.8%
MQ3520 BOS → STL 116 81.3%
YX4500 BOS → STL 115 92.6%
WN3126 STL → BOS 109 72.5%
YX4386 BOS → STL 104 99.0%
WN2357 STL → BOS 82 86.1%
YX4459 STL → BOS 78 92.0%
WN4217 BOS → STL 72 71.4%
YX4678 BOS → STL 72 63.2%
YX4678 STL → BOS 71 51.5%
MQ3718 BOS → STL 67 97.0%
MQ3822 STL → BOS 67 79.1%
WN1438 BOS → STL 64 92.2%
WN3001 STL → BOS 64 84.1%
WN2746 STL → BOS 61 56.7%
WN4607 STL → BOS 61 53.3%
WN2114 STL → BOS 60 58.3%
WN3341 STL → BOS 60 71.7%
WN1747 BOS → STL 58 93.1%
WN3812 STL → BOS 58 77.6%
WN3855 STL → BOS 58 63.8%
WN4439 STL → BOS 58 44.8%
WN702 BOS → STL 58 92.7%
WN752 BOS → STL 58 100.0%
WN882 BOS → STL 58 36.8%
WN908 BOS → STL 58 53.5%
WN993 STL → BOS 58 93.1%
WN3168 STL → BOS 57 59.7%
WN3892 STL → BOS 57 31.6%
WN4054 BOS → STL 57 50.0%
WN4917 BOS → STL 57 66.7%
WN900 BOS → STL 57 100.0%
WN4998 STL → BOS 53 60.0%
MQ3814 STL → BOS 52 90.0%
MQ3814 BOS → STL 52 90.4%
MQ3563 BOS → STL 51 96.1%
WN1163 STL → BOS 51 78.4%
WN3891 STL → BOS 50 80.0%
WN754 BOS → STL 50 16.3%
WN3948 STL → BOS 49 79.6%
MQ4224 BOS → STL 43 79.1%
MQ4224 STL → BOS 43 74.4%
WN1440 BOS → STL 43 90.5%
YX4518 BOS → STL 43 88.4%
YX4624 STL → BOS 43 74.4%
WN1399 BOS → STL 42 57.1%
WN4438 STL → BOS 39 46.2%
WN901 BOS → STL 39 89.7%
WN2457 BOS → STL 36 79.4%
WN4422 STL → BOS 36 74.3%
WN2307 BOS → STL 35 52.9%
WN2717 BOS → STL 34 35.3%
WN3670 BOS → STL 34 91.2%
WN1031 BOS → STL 33 30.3%
WN1268 BOS → STL 33 100.0%
WN1358 BOS → STL 33 93.9%
WN2067 BOS → STL 33 97.0%
WN3731 STL → BOS 33 36.4%
WN3738 STL → BOS 33 69.7%
WN4162 BOS → STL 33 72.7%
WN4724 STL → BOS 33 48.5%
WN569 STL → BOS 33 84.9%
WN3733 STL → BOS 32 71.0%
WN1489 BOS → STL 31 90.3%
WN2507 STL → BOS 31 32.3%
WN3775 BOS → STL 31 40.0%
WN4420 STL → BOS 31 77.4%
WN4409 STL → BOS 30 37.9%
WN458 STL → BOS 30 96.4%

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 289 −1.4% 11 59.9%
June 2026 286 −1.0% 2 67.8%
May 2026 284 −4.1% 0 68.3%
April 2026 267 −4.0% 0 77.2%
March 2026 233 −0.4% 3 67.4%
February 2026 182 +4.6% 14 80.8%
January 2026 192 +4.3% 12 79.7%
December 2025 290 +12.4% 2 74.1%
November 2025 279 +6.5% 3 78.5%
October 2025 298 +56.8% 2 56.0%
September 2025 281 3 70.1%
August 2025 290 0 79.7%
July 2025 293 5 69.6%
June 2025 289 3 70.2%
May 2025 296 2 78.4%
April 2025 278 0 84.9%
March 2025 234 0 85.5%
February 2025 174 4 82.2%
January 2025 184 20 84.2%
December 2024 258 4 82.9%
November 2024 262 0 85.1%
October 2024 190 0 80.0%

How to read this chart

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