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752 km · Domestic

Buffalo Niagara (BUF) – Chicago Midway (MDW)

In July 2026, 180 flights operated between Buffalo Niagara and Chicago Midway (both directions), and 58.9% 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
January6759▼ 11.9%
February5659▲ 5.4%
March63148▲ 134.9%
April100164▲ 64.0%
May114164▲ 43.9%
June177176▼ 0.6%
July192180▼ 6.3%
August167––
September164––
October118–in progress
November108––
December118––
Year to date (Jan–Jul)769950▲ 23.5%

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
January85.1%89.8%▲ 5.5%
February82.1%74.6%▼ 9.1%
March73.0%58.1%▼ 20.4%
April79.0%81.1%▲ 2.7%
May76.3%70.7%▼ 7.3%
June74.0%60.2%▼ 18.6%
July69.3%58.9%▼ 15.0%
August77.8%––
September85.4%––
October83.1%–in progress
November80.6%––
December69.5%––
Year-to-date average (Jan–Jul)77.0%70.5%▼ 8.4%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January110.0%
February01–
March16▲ 500.0%
April00–
May00–
June330.0%
July24▲ 100.0%
August1––
September0––
October0–in progress
November5––
December2––
Year to date (Jan–Jul)715▲ 114.3%

By direction

BUF → MDW

Scheduled flights
1,365
Flights operated
1,350
Cancelled
15 · 1.1%
On-time departures
77.9%

MDW → BUF

Scheduled flights
1,365
Flights operated
1,348
Cancelled
17 · 1.2%
On-time departures
72.0%

BUF → MDW and MDW → BUF counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 2,730 100.0% 75.0% 32

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 delay07:00–08:001.1min · 251 recorded · 249 measured
Gap to highest-delay hour23.9min07:00 ↔ 19:00
Recorded flights2,730BUF–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 · Fewer than 200 measured departures · 38 recorded · 38 measured · Source: the US BTS 06:00 · 93.3% · 389 recorded · 385 measured · Source: the US BTS 07:00 · 93.2% · 251 recorded · 249 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 114 recorded · 113 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 116 recorded · 114 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 52 recorded · 51 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 80 recorded · 80 measured · Source: the US BTS 12:00 · 79.5% · 242 recorded · 239 measured · Source: the US BTS 13:00 · 78.1% · 211 recorded · 210 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 56 recorded · 55 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 59 recorded · 59 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 103 recorded · 102 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 58 recorded · 58 measured · Source: the US BTS 18:00 · 67.0% · 324 recorded · 321 measured · Source: the US BTS 19:00 · 56.0% · 273 recorded · 266 measured · Source: the US BTS 20:00 · 58.9% · 240 recorded · 236 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 81 recorded · 80 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 43 recorded · 42 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 · 38 recorded · 38 measured · Source: the US BTS 06:00 · 4.1 min · 389 recorded · 385 measured · Source: the US BTS 07:00 · 1.1 min · 251 recorded · 249 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 114 recorded · 113 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 116 recorded · 114 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 52 recorded · 51 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 80 recorded · 80 measured · Source: the US BTS 12:00 · 9.6 min · 242 recorded · 239 measured · Source: the US BTS 13:00 · 13.4 min · 211 recorded · 210 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 56 recorded · 55 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 59 recorded · 59 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 103 recorded · 102 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 58 recorded · 58 measured · Source: the US BTS 18:00 · 16.7 min · 324 recorded · 321 measured · Source: the US BTS 19:00 · 24.9 min · 273 recorded · 266 measured · Source: the US BTS 20:00 · 24.1 min · 240 recorded · 236 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 81 recorded · 80 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 43 recorded · 42 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 · 38 · 38 recorded · 38 measured · Source: the US BTS 06:00 · 389 · 389 recorded · 385 measured · Source: the US BTS 07:00 · 251 · 251 recorded · 249 measured · Source: the US BTS 08:00 · 114 · 114 recorded · 113 measured · Source: the US BTS 09:00 · 116 · 116 recorded · 114 measured · Source: the US BTS 10:00 · 52 · 52 recorded · 51 measured · Source: the US BTS 11:00 · 80 · 80 recorded · 80 measured · Source: the US BTS 12:00 · 242 · 242 recorded · 239 measured · Source: the US BTS 13:00 · 211 · 211 recorded · 210 measured · Source: the US BTS 14:00 · 56 · 56 recorded · 55 measured · Source: the US BTS 15:00 · 59 · 59 recorded · 59 measured · Source: the US BTS 16:00 · 103 · 103 recorded · 102 measured · Source: the US BTS 17:00 · 58 · 58 recorded · 58 measured · Source: the US BTS 18:00 · 324 · 324 recorded · 321 measured · Source: the US BTS 19:00 · 273 · 273 recorded · 266 measured · Source: the US BTS 20:00 · 240 · 240 recorded · 236 measured · Source: the US BTS 21:00 · 81 · 81 recorded · 80 measured · Source: the US BTS 22:00 · 43 · 43 recorded · 42 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—3838
06:0093.3%4.1 min385389
07:0093.2%1.1 min249251
08:00Fewer than 200 measured departures—113114
09:00Fewer than 200 measured departures—114116
10:00Fewer than 200 measured departures—5152
11:00Fewer than 200 measured departures—8080
12:0079.5%9.6 min239242
13:0078.1%13.4 min210211
14:00Fewer than 200 measured departures—5556
15:00Fewer than 200 measured departures—5959
16:00Fewer than 200 measured departures—102103
17:00Fewer than 200 measured departures—5858
18:0067.0%16.7 min321324
19:0056.0%24.9 min266273
20:0058.9%24.1 min236240
21:00Fewer than 200 measured departures—8081
22:00Fewer than 200 measured departures—4243
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 74.9% · 428 recorded · 418 measured · Source: the US BTS Tuesday · 80.2% · 407 recorded · 404 measured · Source: the US BTS Wednesday · 80.5% · 408 recorded · 404 measured · Source: the US BTS Thursday · 71.7% · 425 recorded · 421 measured · Source: the US BTS Friday · 73.1% · 428 recorded · 427 measured · Source: the US BTS Saturday · 71.0% · 258 recorded · 255 measured · Source: the US BTS Sunday · 72.1% · 376 recorded · 369 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 · 15.0 min · 428 recorded · 418 measured · Source: the US BTS Tuesday · 9.4 min · 407 recorded · 404 measured · Source: the US BTS Wednesday · 9.3 min · 408 recorded · 404 measured · Source: the US BTS Thursday · 13.7 min · 425 recorded · 421 measured · Source: the US BTS Friday · 15.2 min · 428 recorded · 427 measured · Source: the US BTS Saturday · 14.5 min · 258 recorded · 255 measured · Source: the US BTS Sunday · 16.6 min · 376 recorded · 369 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 · 428 · 428 recorded · 418 measured · Source: the US BTS Tuesday · 407 · 407 recorded · 404 measured · Source: the US BTS Wednesday · 408 · 408 recorded · 404 measured · Source: the US BTS Thursday · 425 · 425 recorded · 421 measured · Source: the US BTS Friday · 428 · 428 recorded · 427 measured · Source: the US BTS Saturday · 258 · 258 recorded · 255 measured · Source: the US BTS Sunday · 376 · 376 recorded · 369 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday74.9%15.0 min418428
Tuesday80.2%9.4 min404407
Wednesday80.5%9.3 min404408
Thursday71.7%13.7 min421425
Friday73.1%15.2 min427428
Saturday71.0%14.5 min255258
Sunday72.1%16.6 min369376

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 · Fewer than 200 measured departures · 128 recorded · 126 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 116 recorded · 115 measured · Source: the US BTS Mar · 62.6% · 218 recorded · 211 measured · Source: the US BTS Apr · 80.3% · 264 recorded · 264 measured · Source: the US BTS May · 73.0% · 278 recorded · 278 measured · Source: the US BTS Jun · 67.1% · 359 recorded · 353 measured · Source: the US BTS Jul · 64.3% · 378 recorded · 372 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 168 recorded · 167 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 164 recorded · 164 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 192 recorded · 192 measured · Source: the US BTS Nov · 86.8% · 225 recorded · 220 measured · Source: the US BTS Dec · 76.3% · 240 recorded · 236 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 · Fewer than 200 measured departures · 128 recorded · 126 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 116 recorded · 115 measured · Source: the US BTS Mar · 18.8 min · 218 recorded · 211 measured · Source: the US BTS Apr · 7.2 min · 264 recorded · 264 measured · Source: the US BTS May · 15.5 min · 278 recorded · 278 measured · Source: the US BTS Jun · 19.0 min · 359 recorded · 353 measured · Source: the US BTS Jul · 21.3 min · 378 recorded · 372 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 168 recorded · 167 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 164 recorded · 164 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 192 recorded · 192 measured · Source: the US BTS Nov · 7.6 min · 225 recorded · 220 measured · Source: the US BTS Dec · 12.4 min · 240 recorded · 236 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 · 128 · 128 recorded · 126 measured · Source: the US BTS Feb · 116 · 116 recorded · 115 measured · Source: the US BTS Mar · 218 · 218 recorded · 211 measured · Source: the US BTS Apr · 264 · 264 recorded · 264 measured · Source: the US BTS May · 278 · 278 recorded · 278 measured · Source: the US BTS Jun · 359 · 359 recorded · 353 measured · Source: the US BTS Jul · 378 · 378 recorded · 372 measured · Source: the US BTS Aug · 168 · 168 recorded · 167 measured · Source: the US BTS Sep · 164 · 164 recorded · 164 measured · Source: the US BTS Oct · 192 · 192 recorded · 192 measured · Source: the US BTS Nov · 225 · 225 recorded · 220 measured · Source: the US BTS Dec · 240 · 240 recorded · 236 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—126128
FebFewer than 200 measured departures—115116
Mar62.6%18.8 min211218
Apr80.3%7.2 min264264
May73.0%15.5 min278278
Jun67.1%19.0 min353359
Jul64.3%21.3 min372378
AugFewer than 200 measured departures—167168
SepFewer than 200 measured departures—164164
OctFewer than 200 measured departures—192192
Nov86.8%7.6 min220225
Dec76.3%12.4 min236240

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 74.1% 2,023
  • Delayed >15 min 24.7% 675
  • Cancelled 1.2% 32
  • 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

35
35 of 35
Flight numbersBy direction DeparturesOn time
WN1360 BUF → MDW 117 94.0%
WN2058 MDW → BUF 101 72.3%
WN2240 MDW → BUF 62 67.2%
WN3041 BUF → MDW 61 81.7%
WN255 MDW → BUF 60 47.5%
WN1468 BUF → MDW 58 93.1%
WN4498 MDW → BUF 58 78.6%
WN3583 MDW → BUF 57 80.7%
WN724 BUF → MDW 53 94.3%
WN2754 BUF → MDW 50 80.0%
WN3195 MDW → BUF 50 79.6%
WN3872 BUF → MDW 50 95.9%
WN768 BUF → MDW 50 41.7%
WN2164 MDW → BUF 49 69.4%
WN758 MDW → BUF 49 87.8%
WN2789 BUF → MDW 45 44.4%
WN2269 MDW → BUF 44 88.6%
WN2663 MDW → BUF 43 72.1%
WN4738 MDW → BUF 43 71.4%
WN2345 BUF → MDW 42 92.9%
WN267 BUF → MDW 42 76.2%
WN3537 MDW → BUF 42 85.7%
WN3816 MDW → BUF 42 69.1%
WN4504 BUF → MDW 42 78.6%
WN694 MDW → BUF 42 73.8%
WN766 BUF → MDW 42 43.9%
WN801 BUF → MDW 42 82.9%
WN1700 BUF → MDW 41 94.9%
WN1655 MDW → BUF 34 47.1%
WN2073 MDW → BUF 34 93.9%
WN4110 MDW → BUF 34 16.1%
WN2834 MDW → BUF 33 56.3%
WN1093 MDW → BUF 31 93.6%
WN3314 BUF → MDW 31 90.3%
WN3638 MDW → BUF 31 74.2%

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 180 −6.3% 4 58.9%
June 2026 176 −0.6% 3 60.2%
May 2026 164 +43.9% 0 70.7%
April 2026 164 +64.0% 0 81.1%
March 2026 148 +134.9% 6 58.1%
February 2026 59 +5.4% 1 74.6%
January 2026 59 −11.9% 1 89.8%
December 2025 118 +0.0% 2 69.5%
November 2025 108 −3.6% 5 80.6%
October 2025 118 +59.5% 0 83.1%
September 2025 164 0 85.4%
August 2025 167 1 77.8%
July 2025 192 2 69.3%
June 2025 177 3 74.0%
May 2025 114 0 76.3%
April 2025 100 0 79.0%
March 2025 63 1 73.0%
February 2025 56 0 82.1%
January 2025 67 1 85.1%
December 2024 118 2 83.1%
November 2024 112 0 92.9%
October 2024 74 0 82.4%

How to read this chart

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