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2,977 km · Domestic

Chicago Midway (MDW) – San Francisco (SFO)

In July 2026, 120 flights operated between Chicago Midway and San Francisco (both directions), and 45.8% 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
January28280.0%
February38380.0%
March57106▲ 86.0%
April60117▲ 95.0%
May62124▲ 100.0%
June60120▲ 100.0%
July60120▲ 100.0%
August62––
September60––
October62–in progress
November59––
December62––
Year to date (Jan–Jul)365653▲ 78.9%

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
January82.1%64.3%▼ 21.7%
February76.3%92.1%▲ 20.7%
March71.9%68.9%▼ 4.2%
April68.3%65.0%▼ 4.8%
May69.4%42.7%▼ 38.5%
June75.0%45.0%▼ 40.0%
July73.3%45.8%▼ 37.5%
August82.3%––
September78.3%––
October79.0%–in progress
November88.1%––
December79.0%––
Year-to-date average (Jan–Jul)73.8%60.5%▼ 17.9%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January00–
February00–
March16▲ 500.0%
April03–
May00–
June00–
July220.0%
August0––
September0––
October0–in progress
November1––
December0––
Year to date (Jan–Jul)311▲ 266.7%

By direction

MDW → SFO

Scheduled flights
757
Flights operated
750
Cancelled
7 · 0.9%
On-time departures
59.9%

SFO → MDW

Scheduled flights
757
Flights operated
749
Cancelled
8 · 1.1%
On-time departures
76.0%

MDW → SFO and SFO → MDW counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 1,514 100.0% 67.9% 15

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 delay10:00–11:0027.7min · 229 recorded · 228 measured
Recorded flights1,514MDW–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 · 143 recorded · 139 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 190 recorded · 189 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 56 recorded · 55 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 160 recorded · 160 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 78 recorded · 78 measured · Source: the US BTS 10:00 · 47.8% · 229 recorded · 228 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 98 recorded · 98 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 63 recorded · 62 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 65 recorded · 65 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 15 recorded · 15 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 31 recorded · 30 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 38 recorded · 38 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 6 recorded · 6 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 23 recorded · 23 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 22 recorded · 22 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 7 recorded · 7 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 133 recorded · 129 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 8 recorded · 8 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 149 recorded · 147 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 · 143 recorded · 139 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 190 recorded · 189 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 56 recorded · 55 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 160 recorded · 160 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 78 recorded · 78 measured · Source: the US BTS 10:00 · 27.7 min · 229 recorded · 228 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 98 recorded · 98 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 63 recorded · 62 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 65 recorded · 65 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 15 recorded · 15 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 31 recorded · 30 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 38 recorded · 38 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 6 recorded · 6 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 23 recorded · 23 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 22 recorded · 22 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 7 recorded · 7 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 133 recorded · 129 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 8 recorded · 8 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 149 recorded · 147 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 · 143 · 143 recorded · 139 measured · Source: the US BTS 06:00 · 190 · 190 recorded · 189 measured · Source: the US BTS 07:00 · 56 · 56 recorded · 55 measured · Source: the US BTS 08:00 · 160 · 160 recorded · 160 measured · Source: the US BTS 09:00 · 78 · 78 recorded · 78 measured · Source: the US BTS 10:00 · 229 · 229 recorded · 228 measured · Source: the US BTS 11:00 · 98 · 98 recorded · 98 measured · Source: the US BTS 12:00 · 63 · 63 recorded · 62 measured · Source: the US BTS 13:00 · 65 · 65 recorded · 65 measured · Source: the US BTS 14:00 · 15 · 15 recorded · 15 measured · Source: the US BTS 15:00 · 31 · 31 recorded · 30 measured · Source: the US BTS 16:00 · 38 · 38 recorded · 38 measured · Source: the US BTS 17:00 · 6 · 6 recorded · 6 measured · Source: the US BTS 18:00 · 23 · 23 recorded · 23 measured · Source: the US BTS 19:00 · 22 · 22 recorded · 22 measured · Source: the US BTS 20:00 · 7 · 7 recorded · 7 measured · Source: the US BTS 21:00 · 133 · 133 recorded · 129 measured · Source: the US BTS 22:00 · 8 · 8 recorded · 8 measured · Source: the US BTS 23:00 · 149 · 149 recorded · 147 measured · Source: the US BTS

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

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—139143
06:00Fewer than 200 measured departures—189190
07:00Fewer than 200 measured departures—5556
08:00Fewer than 200 measured departures—160160
09:00Fewer than 200 measured departures—7878
10:0047.8%27.7 min228229
11:00Fewer than 200 measured departures—9898
12:00Fewer than 200 measured departures—6263
13:00Fewer than 200 measured departures—6565
14:00Fewer than 200 measured departures—1515
15:00Fewer than 200 measured departures—3031
16:00Fewer than 200 measured departures—3838
17:00Fewer than 200 measured departures—66
18:00Fewer than 200 measured departures—2323
19:00Fewer than 200 measured departures—2222
20:00Fewer than 200 measured departures—77
21:00Fewer than 200 measured departures—129133
22:00Fewer than 200 measured departures—88
23:00Fewer than 200 measured departures—147149

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 64.4% · 224 recorded · 222 measured · Source: the US BTS Tuesday · Fewer than 200 measured departures · 198 recorded · 198 measured · Source: the US BTS Wednesday · Fewer than 200 measured departures · 194 recorded · 193 measured · Source: the US BTS Thursday · 68.2% · 222 recorded · 217 measured · Source: the US BTS Friday · 65.2% · 226 recorded · 224 measured · Source: the US BTS Saturday · 72.9% · 228 recorded · 225 measured · Source: the US BTS Sunday · 59.6% · 222 recorded · 220 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 · 19.2 min · 224 recorded · 222 measured · Source: the US BTS Tuesday · Fewer than 200 measured departures · 198 recorded · 198 measured · Source: the US BTS Wednesday · Fewer than 200 measured departures · 194 recorded · 193 measured · Source: the US BTS Thursday · 22.0 min · 222 recorded · 217 measured · Source: the US BTS Friday · 22.2 min · 226 recorded · 224 measured · Source: the US BTS Saturday · 13.0 min · 228 recorded · 225 measured · Source: the US BTS Sunday · 24.8 min · 222 recorded · 220 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 · 224 · 224 recorded · 222 measured · Source: the US BTS Tuesday · 198 · 198 recorded · 198 measured · Source: the US BTS Wednesday · 194 · 194 recorded · 193 measured · Source: the US BTS Thursday · 222 · 222 recorded · 217 measured · Source: the US BTS Friday · 226 · 226 recorded · 224 measured · Source: the US BTS Saturday · 228 · 228 recorded · 225 measured · Source: the US BTS Sunday · 222 · 222 recorded · 220 measured · Source: the US BTS

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

View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday64.4%19.2 min222224
TuesdayFewer than 200 measured departures—198198
WednesdayFewer than 200 measured departures—193194
Thursday68.2%22.0 min217222
Friday65.2%22.2 min224226
Saturday72.9%13.0 min225228
Sunday59.6%24.8 min220222

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 56 · 56 recorded · 56 measured · Source: the US BTS Feb · 76 · 76 recorded · 76 measured · Source: the US BTS Mar · 170 · 170 recorded · 163 measured · Source: the US BTS Apr · 180 · 180 recorded · 177 measured · Source: the US BTS May · 186 · 186 recorded · 186 measured · Source: the US BTS Jun · 180 · 180 recorded · 180 measured · Source: the US BTS Jul · 184 · 184 recorded · 180 measured · Source: the US BTS Aug · 62 · 62 recorded · 62 measured · Source: the US BTS Sep · 60 · 60 recorded · 60 measured · Source: the US BTS Oct · 116 · 116 recorded · 116 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.

No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.

View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—5656
FebFewer than 200 measured departures—7676
MarFewer than 200 measured departures—163170
AprFewer than 200 measured departures—177180
MayFewer than 200 measured departures—186186
JunFewer than 200 measured departures—180180
JulFewer than 200 measured departures—180184
AugFewer than 200 measured departures—6262
SepFewer than 200 measured departures—6060
OctFewer than 200 measured departures—116116
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 67.2% 1,018
  • Delayed >15 min 31.8% 481
  • Cancelled 1.0% 15
  • 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

23
23 of 23
Flight numbersBy direction DeparturesOn time
WN3831 SFO → MDW 61 91.7%
WN1841 MDW → SFO 60 68.3%
WN2276 MDW → SFO 58 79.3%
WN2301 SFO → MDW 58 77.6%
WN2318 SFO → MDW 58 96.6%
WN3649 SFO → MDW 58 28.1%
WN3917 MDW → SFO 58 41.4%
WN4216 SFO → MDW 58 39.7%
WN1786 MDW → SFO 57 36.8%
WN1546 MDW → SFO 50 12.0%
WN2893 MDW → SFO 50 38.8%
WN3780 MDW → SFO 46 76.1%
WN1779 SFO → MDW 41 87.8%
WN537 MDW → SFO 41 51.2%
WN2502 SFO → MDW 40 55.0%
WN1679 SFO → MDW 34 79.4%
WN2185 MDW → SFO 33 60.6%
WN3402 MDW → SFO 33 72.7%
WN3938 SFO → MDW 33 86.2%
WN1267 MDW → SFO 32 44.8%
WN1945 SFO → MDW 32 64.5%
WN2080 SFO → MDW 30 86.7%
WN4692 MDW → SFO 30 86.7%

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 120 +100.0% 2 45.8%
June 2026 120 +100.0% 0 45.0%
May 2026 124 +100.0% 0 42.7%
April 2026 117 +95.0% 3 65.0%
March 2026 106 +86.0% 6 68.9%
February 2026 38 +0.0% 0 92.1%
January 2026 28 +0.0% 0 64.3%
December 2025 62 +0.0% 0 79.0%
November 2025 59 −1.7% 1 88.1%
October 2025 62 +14.8% 0 79.0%
September 2025 60 0 78.3%
August 2025 62 0 82.3%
July 2025 60 2 73.3%
June 2025 60 0 75.0%
May 2025 62 0 69.4%
April 2025 60 0 68.3%
March 2025 57 1 71.9%
February 2025 38 0 76.3%
January 2025 28 0 82.1%
December 2024 62 0 79.0%
November 2024 60 0 80.0%
October 2024 54 0 79.6%

How to read this chart

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