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1,381 km · Domestic

Boston Logan (BOS) – Chicago Midway (MDW)

In July 2026, 296 flights operated between Boston Logan and Chicago Midway (both directions), and 59.8% 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
January141134▼ 5.0%
February132118▼ 10.6%
March148222▲ 50.0%
April184238▲ 29.3%
May202246▲ 21.8%
June314280▼ 10.8%
July338296▼ 12.4%
August267––
September254––
October276–in progress
November168––
December180––
Year to date (Jan–Jul)1,4591,534▲ 5.1%

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
January83.0%85.1%▲ 2.5%
February81.1%72.9%▼ 10.1%
March82.4%52.3%▼ 36.5%
April84.2%66.8%▼ 20.7%
May63.4%66.3%▲ 4.6%
June67.5%57.5%▼ 14.8%
July64.8%59.8%▼ 7.7%
August75.3%––
September52.8%––
October60.5%–in progress
November75.0%––
December67.8%––
Year-to-date average (Jan–Jul)75.2%65.8%▼ 12.5%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January14▲ 300.0%
February08–
March24▲ 100.0%
April00–
May00–
June06–
July660.0%
August2––
September2––
October2–in progress
November8––
December0––
Year to date (Jan–Jul)928▲ 211.1%

By direction

BOS → MDW

Scheduled flights
2,355
Flights operated
2,322
Cancelled
33 · 1.4%
On-time departures
69.1%

MDW → BOS

Scheduled flights
2,374
Flights operated
2,352
Cancelled
22 · 0.9%
On-time departures
68.2%

BOS → MDW and MDW → BOS counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 4,729 100.0% 68.6% 55

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 delay06:00–07:000.8min · 252 recorded · 250 measured
Gap to highest-delay hour35.4min06:00 ↔ 20:00
Recorded flights4,729BOS–MDW

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 · 93.4% · 461 recorded · 455 measured · Source: the US BTS 06:00 · 93.2% · 252 recorded · 250 measured · Source: the US BTS 07:00 · 91.2% · 413 recorded · 411 measured · Source: the US BTS 08:00 · 84.7% · 237 recorded · 235 measured · Source: the US BTS 09:00 · 87.4% · 347 recorded · 342 measured · Source: the US BTS 10:00 · 88.0% · 233 recorded · 233 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 78 recorded · 77 measured · Source: the US BTS 12:00 · 64.6% · 263 recorded · 263 measured · Source: the US BTS 13:00 · 60.0% · 336 recorded · 335 measured · Source: the US BTS 14:00 · 63.7% · 307 recorded · 306 measured · Source: the US BTS 15:00 · 47.2% · 258 recorded · 254 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 168 recorded · 167 measured · Source: the US BTS 17:00 · 49.7% · 295 recorded · 290 measured · Source: the US BTS 18:00 · 49.4% · 548 recorded · 537 measured · Source: the US BTS 19:00 · 49.8% · 263 recorded · 255 measured · Source: the US BTS 20:00 · 46.3% · 206 recorded · 201 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 47 recorded · 46 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 17 recorded · 17 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 · 2.4 min · 461 recorded · 455 measured · Source: the US BTS 06:00 · 0.8 min · 252 recorded · 250 measured · Source: the US BTS 07:00 · 3.8 min · 413 recorded · 411 measured · Source: the US BTS 08:00 · 7.4 min · 237 recorded · 235 measured · Source: the US BTS 09:00 · 4.8 min · 347 recorded · 342 measured · Source: the US BTS 10:00 · 4.1 min · 233 recorded · 233 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 78 recorded · 77 measured · Source: the US BTS 12:00 · 21.9 min · 263 recorded · 263 measured · Source: the US BTS 13:00 · 27.4 min · 336 recorded · 335 measured · Source: the US BTS 14:00 · 20.2 min · 307 recorded · 306 measured · Source: the US BTS 15:00 · 36.1 min · 258 recorded · 254 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 168 recorded · 167 measured · Source: the US BTS 17:00 · 32.7 min · 295 recorded · 290 measured · Source: the US BTS 18:00 · 33.9 min · 548 recorded · 537 measured · Source: the US BTS 19:00 · 36.0 min · 263 recorded · 255 measured · Source: the US BTS 20:00 · 36.2 min · 206 recorded · 201 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 47 recorded · 46 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 17 recorded · 17 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.

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 · 461 · 461 recorded · 455 measured · Source: the US BTS 06:00 · 252 · 252 recorded · 250 measured · Source: the US BTS 07:00 · 413 · 413 recorded · 411 measured · Source: the US BTS 08:00 · 237 · 237 recorded · 235 measured · Source: the US BTS 09:00 · 347 · 347 recorded · 342 measured · Source: the US BTS 10:00 · 233 · 233 recorded · 233 measured · Source: the US BTS 11:00 · 78 · 78 recorded · 77 measured · Source: the US BTS 12:00 · 263 · 263 recorded · 263 measured · Source: the US BTS 13:00 · 336 · 336 recorded · 335 measured · Source: the US BTS 14:00 · 307 · 307 recorded · 306 measured · Source: the US BTS 15:00 · 258 · 258 recorded · 254 measured · Source: the US BTS 16:00 · 168 · 168 recorded · 167 measured · Source: the US BTS 17:00 · 295 · 295 recorded · 290 measured · Source: the US BTS 18:00 · 548 · 548 recorded · 537 measured · Source: the US BTS 19:00 · 263 · 263 recorded · 255 measured · Source: the US BTS 20:00 · 206 · 206 recorded · 201 measured · Source: the US BTS 21:00 · 47 · 47 recorded · 46 measured · Source: the US BTS 22:00 · 17 · 17 recorded · 17 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———
05:0093.4%2.4 min455461
06:0093.2%0.8 min250252
07:0091.2%3.8 min411413
08:0084.7%7.4 min235237
09:0087.4%4.8 min342347
10:0088.0%4.1 min233233
11:00Fewer than 200 measured departures—7778
12:0064.6%21.9 min263263
13:0060.0%27.4 min335336
14:0063.7%20.2 min306307
15:0047.2%36.1 min254258
16:00Fewer than 200 measured departures—167168
17:0049.7%32.7 min290295
18:0049.4%33.9 min537548
19:0049.8%36.0 min255263
20:0046.3%36.2 min201206
21:00Fewer than 200 measured departures—4647
22:00Fewer than 200 measured departures—1717
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 65.1% · 698 recorded · 685 measured · Source: the US BTS Tuesday · 72.9% · 620 recorded · 615 measured · Source: the US BTS Wednesday · 74.2% · 612 recorded · 608 measured · Source: the US BTS Thursday · 63.7% · 701 recorded · 692 measured · Source: the US BTS Friday · 68.5% · 715 recorded · 708 measured · Source: the US BTS Saturday · 74.7% · 652 recorded · 643 measured · Source: the US BTS Sunday · 63.1% · 731 recorded · 723 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 · 23.0 min · 698 recorded · 685 measured · Source: the US BTS Tuesday · 16.2 min · 620 recorded · 615 measured · Source: the US BTS Wednesday · 14.0 min · 612 recorded · 608 measured · Source: the US BTS Thursday · 24.3 min · 701 recorded · 692 measured · Source: the US BTS Friday · 21.1 min · 715 recorded · 708 measured · Source: the US BTS Saturday · 13.5 min · 652 recorded · 643 measured · Source: the US BTS Sunday · 23.2 min · 731 recorded · 723 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
Monday · 698 · 698 recorded · 685 measured · Source: the US BTS Tuesday · 620 · 620 recorded · 615 measured · Source: the US BTS Wednesday · 612 · 612 recorded · 608 measured · Source: the US BTS Thursday · 701 · 701 recorded · 692 measured · Source: the US BTS Friday · 715 · 715 recorded · 708 measured · Source: the US BTS Saturday · 652 · 652 recorded · 643 measured · Source: the US BTS Sunday · 731 · 731 recorded · 723 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday65.1%23.0 min685698
Tuesday72.9%16.2 min615620
Wednesday74.2%14.0 min608612
Thursday63.7%24.3 min692701
Friday68.5%21.1 min708715
Saturday74.7%13.5 min643652
Sunday63.1%23.2 min723731

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 · 84.0% · 280 recorded · 275 measured · Source: the US BTS Feb · 77.2% · 258 recorded · 250 measured · Source: the US BTS Mar · 64.3% · 376 recorded · 370 measured · Source: the US BTS Apr · 74.4% · 422 recorded · 422 measured · Source: the US BTS May · 65.0% · 448 recorded · 448 measured · Source: the US BTS Jun · 62.8% · 600 recorded · 594 measured · Source: the US BTS Jul · 62.5% · 646 recorded · 634 measured · Source: the US BTS Aug · 75.3% · 269 recorded · 267 measured · Source: the US BTS Sep · 52.8% · 256 recorded · 254 measured · Source: the US BTS Oct · 68.9% · 458 recorded · 456 measured · Source: the US BTS Nov · 79.2% · 354 recorded · 346 measured · Source: the US BTS Dec · 69.3% · 362 recorded · 358 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 · 5.1 min · 280 recorded · 275 measured · Source: the US BTS Feb · 11.9 min · 258 recorded · 250 measured · Source: the US BTS Mar · 19.8 min · 376 recorded · 370 measured · Source: the US BTS Apr · 12.9 min · 422 recorded · 422 measured · Source: the US BTS May · 22.0 min · 448 recorded · 448 measured · Source: the US BTS Jun · 22.9 min · 600 recorded · 594 measured · Source: the US BTS Jul · 27.8 min · 646 recorded · 634 measured · Source: the US BTS Aug · 18.3 min · 269 recorded · 267 measured · Source: the US BTS Sep · 36.4 min · 256 recorded · 254 measured · Source: the US BTS Oct · 17.7 min · 458 recorded · 456 measured · Source: the US BTS Nov · 13.7 min · 354 recorded · 346 measured · Source: the US BTS Dec · 17.6 min · 362 recorded · 358 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 · 280 · 280 recorded · 275 measured · Source: the US BTS Feb · 258 · 258 recorded · 250 measured · Source: the US BTS Mar · 376 · 376 recorded · 370 measured · Source: the US BTS Apr · 422 · 422 recorded · 422 measured · Source: the US BTS May · 448 · 448 recorded · 448 measured · Source: the US BTS Jun · 600 · 600 recorded · 594 measured · Source: the US BTS Jul · 646 · 646 recorded · 634 measured · Source: the US BTS Aug · 269 · 269 recorded · 267 measured · Source: the US BTS Sep · 256 · 256 recorded · 254 measured · Source: the US BTS Oct · 458 · 458 recorded · 456 measured · Source: the US BTS Nov · 354 · 354 recorded · 346 measured · Source: the US BTS Dec · 362 · 362 recorded · 358 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan84.0%5.1 min275280
Feb77.2%11.9 min250258
Mar64.3%19.8 min370376
Apr74.4%12.9 min422422
May65.0%22.0 min448448
Jun62.8%22.9 min594600
Jul62.5%27.8 min634646
Aug75.3%18.3 min267269
Sep52.8%36.4 min254256
Oct68.9%17.7 min456458
Nov79.2%13.7 min346354
Dec69.3%17.6 min358362

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 67.8% 3,207
  • Delayed >15 min 31.0% 1,467
  • Cancelled 1.2% 55
  • 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

70
70 of 70
Flight numbersBy direction DeparturesOn time
WN787 BOS → MDW 122 92.4%
WN2666 MDW → BOS 107 91.6%
WN1435 BOS → MDW 100 84.0%
WN1933 MDW → BOS 82 78.1%
WN3678 MDW → BOS 64 82.5%
WN1773 MDW → BOS 63 67.7%
WN1011 MDW → BOS 61 56.7%
WN1431 BOS → MDW 61 91.8%
WN3786 MDW → BOS 61 66.7%
WN3787 MDW → BOS 61 65.0%
WN1427 MDW → BOS 60 88.3%
WN1432 BOS → MDW 59 81.4%
WN3911 BOS → MDW 59 42.9%
WN1280 MDW → BOS 58 53.5%
WN2392 MDW → BOS 58 48.3%
WN3544 MDW → BOS 58 48.3%
WN3665 BOS → MDW 58 34.5%
WN4611 MDW → BOS 58 91.4%
WN4975 MDW → BOS 58 28.1%
WN576 BOS → MDW 58 89.7%
WN699 BOS → MDW 58 94.6%
WN701 BOS → MDW 58 63.0%
WN987 MDW → BOS 58 89.3%
WN1240 MDW → BOS 57 66.7%
WN2650 BOS → MDW 57 82.5%
WN745 BOS → MDW 57 98.2%
WN171 MDW → BOS 51 80.4%
WN1908 BOS → MDW 51 25.5%
WN1405 MDW → BOS 50 86.0%
WN3726 BOS → MDW 50 68.0%
WN898 BOS → MDW 50 46.0%
WN961 BOS → MDW 50 94.0%
WN3737 MDW → BOS 49 85.7%
WN776 BOS → MDW 49 93.9%
WN1549 BOS → MDW 46 65.2%
WN2012 BOS → MDW 46 73.3%
WN784 BOS → MDW 43 39.0%
WN1433 BOS → MDW 42 78.1%
WN278 MDW → BOS 42 52.4%
WN4106 BOS → MDW 42 26.8%
WN2657 MDW → BOS 41 78.1%
WN746 BOS → MDW 41 48.8%
WN937 MDW → BOS 41 27.5%
WN1497 MDW → BOS 40 85.0%
WN3653 MDW → BOS 40 80.0%
WN3680 MDW → BOS 40 53.9%
WN483 MDW → BOS 39 35.9%
WN4815 MDW → BOS 37 78.4%
WN2229 MDW → BOS 36 83.3%
WN1434 BOS → MDW 34 61.8%
WN1800 MDW → BOS 34 82.4%
WN1159 BOS → MDW 33 93.8%
WN1266 BOS → MDW 33 23.3%
WN1669 MDW → BOS 33 72.7%
WN1740 MDW → BOS 33 30.3%
WN3239 BOS → MDW 33 90.9%
WN3273 MDW → BOS 33 63.6%
WN3352 MDW → BOS 33 84.9%
WN527 BOS → MDW 33 75.8%
WN833 BOS → MDW 33 93.9%
WN1132 MDW → BOS 32 56.3%
WN2320 BOS → MDW 32 93.8%
WN404 MDW → BOS 32 93.8%
WN736 BOS → MDW 32 35.5%
WN1477 BOS → MDW 31 93.6%
WN1482 BOS → MDW 31 87.1%
WN3249 BOS → MDW 31 74.2%
WN3250 MDW → BOS 31 76.7%
WN1779 BOS → MDW 30 30.0%
WN4295 MDW → BOS 30 96.7%

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 296 −12.4% 6 59.8%
June 2026 280 −10.8% 6 57.5%
May 2026 246 +21.8% 0 66.3%
April 2026 238 +29.3% 0 66.8%
March 2026 222 +50.0% 4 52.3%
February 2026 118 −10.6% 8 72.9%
January 2026 134 −5.0% 4 85.1%
December 2025 180 +1.1% 0 67.8%
November 2025 168 −5.6% 8 75.0%
October 2025 276 +53.3% 2 60.5%
September 2025 254 2 52.8%
August 2025 267 2 75.3%
July 2025 338 6 64.8%
June 2025 314 0 67.5%
May 2025 202 0 63.4%
April 2025 184 0 84.2%
March 2025 148 2 82.4%
February 2025 132 0 81.1%
January 2025 141 1 83.0%
December 2024 178 4 70.8%
November 2024 178 0 83.1%
October 2024 180 0 81.7%

How to read this chart

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