WN1242 SEA → STL

Southwest Airlines · Seattle, WA to St. Louis, MO · 35 flights observed, 2025-07-01 to 2025-08-04 · 1,709 mi

This flight's reliability varies a lot by day of week — 80% on-time on Wednesdays vs. 40% on Mondays.

WN1242 covers more than one route in the data window — the stats below are for SEA → STL, the one it has flown most recently. The others are linked under “Other routes”.

On-time arrival
59%
Median delay
+10 min
90th percentile
+54 min
Cancellation rate
0%

How often is WN1242 on time?

Across 35 flights on SEA → STL from 2025-07-01 to 2025-08-04, WN1242 arrived within 15 minutes of schedule 59% of the time. The median arrival delay was +10 min, and the worst 10% of flights arrived +54 min or later. 0% of flights were cancelled.

Delay distribution

Arrival delay for completed flights (excludes cancellations and diversions).

ArrivalFlightsShare
Early / on-time2059%
16-30 min39%
31-60 min824%
61-120 min39%
2+ hrs00%

Performance by month

MonthFlightsOn-timeAvg delay
2025-073060%+18 min
2025-08450%+28 min

Performance by day of week

DayFlightsOn-time
Mon540%
Tue540%
Wed580%
Thu540%
Fri540%
Sat580%
Sun4100%

Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…