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2,782 km · Domestic

Chicago Midway (MDW) – Seattle–Tacoma (SEA)

In July 2026, 174 flights operated between Chicago Midway and Seattle–Tacoma (both directions), and 52.9% 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
January62620.0%
February56560.0%
March62113▲ 82.3%
April60120▲ 100.0%
May62124▲ 100.0%
June156165▲ 5.8%
July1741740.0%
August176––
September172––
October66–in progress
November59––
December62––
Year to date (Jan–Jul)632814▲ 28.8%

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
January80.6%93.5%▲ 16.0%
February82.1%91.1%▲ 11.0%
March79.0%69.9%▼ 11.5%
April91.7%74.2%▼ 19.1%
May79.0%79.8%▲ 1.0%
June66.7%54.5%▼ 18.3%
July61.5%52.9%▼ 14.0%
August65.9%––
September74.4%––
October84.8%–in progress
November79.7%––
December80.6%––
Year-to-date average (Jan–Jul)77.2%73.7%▼ 4.6%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January00–
February00–
March03–
April00–
May00–
June01–
July220.0%
August0––
September0––
October0–in progress
November1––
December0––
Year to date (Jan–Jul)26▲ 200.0%

By direction

MDW → SEA

Scheduled flights
1,076
Flights operated
1,071
Cancelled
5 · 0.5%
On-time departures
65.9%

SEA → MDW

Scheduled flights
1,076
Flights operated
1,072
Cancelled
4 · 0.4%
On-time departures
78.5%

MDW → SEA and SEA → MDW counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 2,152 100.0% 72.2% 9

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 delay06:00–07:002.6min · 233 recorded · 232 measured
Gap to highest-delay hour13.4min06:00 ↔ 23:00
Recorded flights2,152MDW–SEA

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 · 180 recorded · 178 measured · Source: the US BTS 06:00 · 92.7% · 233 recorded · 232 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 64 recorded · 64 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 100 recorded · 100 measured · Source: the US BTS 09:00 · 85.0% · 207 recorded · 207 measured · Source: the US BTS 10:00 · 78.6% · 296 recorded · 294 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 114 recorded · 114 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 45 recorded · 45 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 128 recorded · 128 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 50 recorded · 50 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 21 recorded · 21 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 59 recorded · 59 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 109 recorded · 109 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 16 recorded · 16 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 11 recorded · 10 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 182 recorded · 182 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 128 recorded · 125 measured · Source: the US BTS 23:00 · 66.4% · 208 recorded · 208 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 · 180 recorded · 178 measured · Source: the US BTS 06:00 · 2.6 min · 233 recorded · 232 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 64 recorded · 64 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 100 recorded · 100 measured · Source: the US BTS 09:00 · 6.0 min · 207 recorded · 207 measured · Source: the US BTS 10:00 · 11.3 min · 296 recorded · 294 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 114 recorded · 114 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 45 recorded · 45 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 128 recorded · 128 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 50 recorded · 50 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 21 recorded · 21 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 59 recorded · 59 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 109 recorded · 109 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 16 recorded · 16 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 11 recorded · 10 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 182 recorded · 182 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 128 recorded · 125 measured · Source: the US BTS 23:00 · 16.0 min · 208 recorded · 208 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 · 180 · 180 recorded · 178 measured · Source: the US BTS 06:00 · 233 · 233 recorded · 232 measured · Source: the US BTS 07:00 · 64 · 64 recorded · 64 measured · Source: the US BTS 08:00 · 100 · 100 recorded · 100 measured · Source: the US BTS 09:00 · 207 · 207 recorded · 207 measured · Source: the US BTS 10:00 · 296 · 296 recorded · 294 measured · Source: the US BTS 11:00 · 114 · 114 recorded · 114 measured · Source: the US BTS 12:00 · 45 · 45 recorded · 45 measured · Source: the US BTS 13:00 · 128 · 128 recorded · 128 measured · Source: the US BTS 14:00 · 50 · 50 recorded · 50 measured · Source: the US BTS 15:00 · 21 · 21 recorded · 21 measured · Source: the US BTS 16:00 · 59 · 59 recorded · 59 measured · Source: the US BTS 17:00 · 109 · 109 recorded · 109 measured · Source: the US BTS 18:00 · 16 · 16 recorded · 16 measured · Source: the US BTS 19:00 · 11 · 11 recorded · 10 measured · Source: the US BTS 20:00 · 1 · 1 recorded · 1 measured · Source: the US BTS 21:00 · 182 · 182 recorded · 182 measured · Source: the US BTS 22:00 · 128 · 128 recorded · 125 measured · Source: the US BTS 23:00 · 208 · 208 recorded · 208 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—178180
06:0092.7%2.6 min232233
07:00Fewer than 200 measured departures—6464
08:00Fewer than 200 measured departures—100100
09:0085.0%6.0 min207207
10:0078.6%11.3 min294296
11:00Fewer than 200 measured departures—114114
12:00Fewer than 200 measured departures—4545
13:00Fewer than 200 measured departures—128128
14:00Fewer than 200 measured departures—5050
15:00Fewer than 200 measured departures—2121
16:00Fewer than 200 measured departures—5959
17:00Fewer than 200 measured departures—109109
18:00Fewer than 200 measured departures—1616
19:00Fewer than 200 measured departures—1011
20:00Fewer than 200 measured departures—11
21:00Fewer than 200 measured departures—182182
22:00Fewer than 200 measured departures—125128
23:0066.4%16.0 min208208

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 68.9% · 314 recorded · 312 measured · Source: the US BTS Tuesday · 75.5% · 314 recorded · 314 measured · Source: the US BTS Wednesday · 76.4% · 314 recorded · 313 measured · Source: the US BTS Thursday · 69.6% · 318 recorded · 316 measured · Source: the US BTS Friday · 67.5% · 316 recorded · 314 measured · Source: the US BTS Saturday · 77.2% · 296 recorded · 294 measured · Source: the US BTS Sunday · 70.7% · 280 recorded · 280 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 · 15.9 min · 314 recorded · 312 measured · Source: the US BTS Tuesday · 11.2 min · 314 recorded · 314 measured · Source: the US BTS Wednesday · 10.2 min · 314 recorded · 313 measured · Source: the US BTS Thursday · 18.3 min · 318 recorded · 316 measured · Source: the US BTS Friday · 18.5 min · 316 recorded · 314 measured · Source: the US BTS Saturday · 11.3 min · 296 recorded · 294 measured · Source: the US BTS Sunday · 13.5 min · 280 recorded · 280 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 · 314 · 314 recorded · 312 measured · Source: the US BTS Tuesday · 314 · 314 recorded · 314 measured · Source: the US BTS Wednesday · 314 · 314 recorded · 313 measured · Source: the US BTS Thursday · 318 · 318 recorded · 316 measured · Source: the US BTS Friday · 316 · 316 recorded · 314 measured · Source: the US BTS Saturday · 296 · 296 recorded · 294 measured · Source: the US BTS Sunday · 280 · 280 recorded · 280 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday68.9%15.9 min312314
Tuesday75.5%11.2 min314314
Wednesday76.4%10.2 min313314
Thursday69.6%18.3 min316318
Friday67.5%18.5 min314316
Saturday77.2%11.3 min294296
Sunday70.7%13.5 min280280

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 · 124 recorded · 124 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 112 recorded · 112 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 178 recorded · 175 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 180 recorded · 180 measured · Source: the US BTS May · Fewer than 200 measured departures · 186 recorded · 186 measured · Source: the US BTS Jun · 60.4% · 322 recorded · 321 measured · Source: the US BTS Jul · 57.2% · 352 recorded · 348 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 176 recorded · 176 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 172 recorded · 172 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 106 recorded · 106 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 120 recorded · 119 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 124 recorded · 124 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 · Fewer than 200 measured departures · 124 recorded · 124 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 112 recorded · 112 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 178 recorded · 175 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 180 recorded · 180 measured · Source: the US BTS May · Fewer than 200 measured departures · 186 recorded · 186 measured · Source: the US BTS Jun · 22.4 min · 322 recorded · 321 measured · Source: the US BTS Jul · 23.7 min · 352 recorded · 348 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 176 recorded · 176 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 172 recorded · 172 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 106 recorded · 106 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 120 recorded · 119 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 124 recorded · 124 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 · 124 · 124 recorded · 124 measured · Source: the US BTS Feb · 112 · 112 recorded · 112 measured · Source: the US BTS Mar · 178 · 178 recorded · 175 measured · Source: the US BTS Apr · 180 · 180 recorded · 180 measured · Source: the US BTS May · 186 · 186 recorded · 186 measured · Source: the US BTS Jun · 322 · 322 recorded · 321 measured · Source: the US BTS Jul · 352 · 352 recorded · 348 measured · Source: the US BTS Aug · 176 · 176 recorded · 176 measured · Source: the US BTS Sep · 172 · 172 recorded · 172 measured · Source: the US BTS Oct · 106 · 106 recorded · 106 measured · Source: the US BTS Nov · 120 · 120 recorded · 119 measured · Source: the US BTS Dec · 124 · 124 recorded · 124 measured · Source: the US BTS

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

View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—124124
FebFewer than 200 measured departures—112112
MarFewer than 200 measured departures—175178
AprFewer than 200 measured departures—180180
MayFewer than 200 measured departures—186186
Jun60.4%22.4 min321322
Jul57.2%23.7 min348352
AugFewer than 200 measured departures—176176
SepFewer than 200 measured departures—172172
OctFewer than 200 measured departures—106106
NovFewer than 200 measured departures—119120
DecFewer than 200 measured departures—124124

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 71.9% 1,548
  • Delayed >15 min 27.6% 595
  • Cancelled 0.4% 9
  • 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

28
28 of 28
Flight numbersBy direction DeparturesOn time
WN2299 SEA → MDW 83 88.0%
WN3893 SEA → MDW 61 76.7%
WN4463 SEA → MDW 60 65.0%
WN1807 SEA → MDW 58 91.4%
WN2181 SEA → MDW 58 96.6%
WN2304 SEA → MDW 58 55.2%
WN3378 MDW → SEA 58 58.6%
WN3521 MDW → SEA 58 84.5%
WN1141 MDW → SEA 57 87.7%
WN1666 SEA → MDW 57 61.4%
WN1401 MDW → SEA 50 70.0%
WN3081 SEA → MDW 49 27.1%
WN4144 MDW → SEA 49 42.6%
WN2169 MDW → SEA 47 93.6%
WN1100 SEA → MDW 46 95.7%
WN2144 MDW → SEA 45 66.7%
WN223 MDW → SEA 43 42.9%
WN2447 SEA → MDW 42 69.1%
WN4198 SEA → MDW 39 74.4%
WN4350 MDW → SEA 37 81.1%
WN1437 MDW → SEA 35 40.0%
WN1987 SEA → MDW 34 94.1%
WN2152 SEA → MDW 34 88.2%
WN3353 MDW → SEA 34 44.1%
WN2123 SEA → MDW 33 87.1%
WN2810 SEA → MDW 33 100.0%
WN3640 MDW → SEA 32 37.5%
WN4419 SEA → MDW 32 81.3%

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 174 +0.0% 2 52.9%
June 2026 165 +5.8% 1 54.5%
May 2026 124 +100.0% 0 79.8%
April 2026 120 +100.0% 0 74.2%
March 2026 113 +82.3% 3 69.9%
February 2026 56 +0.0% 0 91.1%
January 2026 62 +0.0% 0 93.5%
December 2025 62 +0.0% 0 80.6%
November 2025 59 −1.7% 1 79.7%
October 2025 66 +65.0% 0 84.8%
September 2025 172 0 74.4%
August 2025 176 0 65.9%
July 2025 174 2 61.5%
June 2025 156 0 66.7%
May 2025 62 0 79.0%
April 2025 60 0 91.7%
March 2025 62 0 79.0%
February 2025 56 0 82.1%
January 2025 62 0 80.6%
December 2024 62 0 77.4%
November 2024 60 0 90.0%
October 2024 40 0 77.5%

How to read this chart

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