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Flight records through . Security counts through .

Which SFO to MDW flight is punctual? Southwest 3556, 11:40 pm.

82% on time across 28 flights in the last 3 months, never cancelled.

Find your flightSFO security

  • WN 3556

    82%

    on time

    11:40 pm

    0% cancelled

  • WN 1779

    82%

    on time

    5:50 am

    0% cancelled

  • WN 3649

    36%

    on time

    11:40 pm

    2% cancelled

3 regular flights, June to August 2026.

When do the flights leave? 3 regular flights, 5:50 am to 11:40 pm.

WN 3649 was cancelled most often, 2% of the time.

Flight records,

  1. WN 1779 5:50 am, 0% cancelled 82%
  2. WN 3556 11:40 pm, 0% cancelled 82%
  3. WN 3649 11:40 pm, 2% cancelled 36%

What time should I fly? The 6 am departures.

89% landed on time; at 10 am, 53%. Tuesday was the best day, Sunday the worst.

Flight records,

DepartsLanded on time
5 am87%
6 am89%
10 am53%
11 pm53%

When is SFO security busiest? 7 am, then 9 am to noon.

Calmest around 4 pm. San Francisco security, hour by hour.

Security counts,

4a8a12p4p8p
Mon
Tue
Wed
Thu
Fri
Sat
Sun
MonTueWedThuFriSatSun
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p

Thursday, 10 am

5,960

people screened, all terminals.