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Flight records through . Security counts through .

Which SEA to SFO flight is punctual? United 5676, 5:15 am.

87% on time across 47 flights in the last 3 months, never cancelled.

Find your flightSEA security
DepartsFlightOn time
5:15 amUA 567687%
11:42 amAS 65562%
7:11 amUA 49962%
3:30 pmUA 247862%
4:36 pmAS 138558%
9:45 pmDL 263554%
2:30 pmDL 370753%
1:16 pmUA 228152%
8 of 27 regular flights, ranked by arrivals on time, June to August 2026.

Which airline is most reliable? Delta and United, neck and neck.

Delta landed on time 62% of the time, United 61%.

Flight records,

  • Delta

    62%

    on time

    1.4% cancelled

  • United

    61%

    on time

    0.9% cancelled

  • Alaska

    55%

    on time

    1.1% cancelled

When do the flights leave? 27 regular flights, 5:15 am to 9:45 pm.

AS 725 was cancelled most often, 3% of the time.

Flight records,

  1. DL 2870 7:20 am, 1% cancelled 31%
  2. DL 1412 9:45 am, 1% cancelled 41%
  3. DL 3707 2:30 pm, 0% cancelled 53%
  4. DL 3991 5:51 pm, 0% cancelled 39%
  5. DL 2635 9:45 pm, 1% cancelled 54%
  1. UA 5676 5:15 am, 0% cancelled 87%
  2. UA 1578 7:00 am, 2% cancelled 18%
  3. UA 499 7:11 am, 0% cancelled 62%
  4. UA 2831 8:45 am, 1% cancelled 29%
  5. UA 1482 10:29 am, 0% cancelled 28%
  6. UA 2281 1:16 pm, 0% cancelled 52%
  7. UA 737 1:30 pm, 0% cancelled 32%
  8. UA 2478 3:30 pm, 0% cancelled 62%
  9. UA 2866 3:33 pm, 0% cancelled 47%
  10. UA 2164 5:20 pm, 0% cancelled 45%
  11. UA 2241 7:05 pm, 2% cancelled 21%
  12. UA 2837 7:05 pm, 0% cancelled 25%
  1. AS 725 7:03 am, 3% cancelled 27%
  2. AS 528 8:53 am, 1% cancelled 34%
  3. AS 688 10:40 am, 0% cancelled 27%
  4. AS 655 11:42 am, 0% cancelled 62%
  5. AS 680 1:20 pm, 3% cancelled 52%
  6. AS 1385 4:36 pm, 0% cancelled 58%
  7. AS 791 5:36 pm, 1% cancelled 30%
  8. AS 619 6:36 pm, 0% cancelled 33%
  9. AS 628 7:42 pm, 0% cancelled 22%
  10. AS 590 8:42 pm, 0% cancelled 25%

What time should I fly? The 5 am departures.

91% landed on time; at 6 pm, 38%. Tuesday was the best day, Monday the worst.

Flight records,

DepartsLanded on time
5 am91%
6 am81%
7 am50%
8 am47%
9 am57%
10 am46%
11 am68%
12 pm78%
1 pm64%
2 pm66%
3 pm68%
4 pm70%
5 pm60%
6 pm38%
7 pm46%
8 pm57%
9 pm67%

When is SEA security busiest? 6 to 10 every morning.

Calmest around 5 pm. Seattle 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

Friday, 7 am

4,660

people screened, all terminals.