No delays reported for WN 3936 (BUF→TPA, TPA→HOU, STL→LAS) as of 6:47 PM ET. It arrived on time 71% of the time in June-August 2026. When it was late, the average delay was 59 minutes. None were cancelled. Right now there are no reported delays at BUF, TPA, HOU, STL, LAS.
May not fly today
Leg 3 of 3 (STL → LAS): Next leg STL → LAS, scheduled 9:55 PM local time. No delays at STL right now. This flight number flew about 4 days a week in June-August 2026, so it may not operate today.
Cancellation risk: Low 0% of its flights were cancelled in June-August 2026.
Estimate from the schedule, live position and airport conditions, if this flight operates today. Check Southwest for official times.
What to do now
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Route and schedule
| Leg | Scheduled | On time |
|---|---|---|
| BUF → TPA Buffalo, NY to Tampa, FL | 6:30 AM → 9:10 AM | 100% |
| TPA → HOU Tampa, FL to Houston, TX | 9:45 AM → 11:05 AM | 88% |
| STL → LAS St. Louis, MO to Las Vegas, NV | 9:55 PM → 11:20 PM | 58% |
Local times. Schedules change; check your booking.
How reliable is WN 3936?
| Arrived on time (within 15 min) | 71% |
| Average delay when late | 59 min |
| Cancelled | 0% |
| Diverted | 1.1% |
| Flights tracked | 94 |
Best and worst days to fly WN 3936
WN 3936 was most reliable on Saturdays (100% on time) and least reliable on Fridays (59%).
| Monday | |
| Tuesday | |
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Why it runs late
| Late-arriving plane | |
| Airline (crew, maintenance) | |
| Air traffic system | |
| Extreme weather |
Share of delay minutes by cause, as reported by Southwest to the Department of Transportation.
Other flights STL → LAS
All flights on this route, ranked
Live status at its airports
We show airport-wide airport status, not this flight's gate or live position. For that, check the Southwest app.
Southwest delays and what you're owed · Airline phone numbers
About this data
On-time history: U.S. Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, June-August 2026. Live conditions: live airport status. "On time" means arriving within 15 minutes of schedule.
Common questions
Is WN 3936 delayed today?
Right now there are no reported delays at BUF, TPA, HOU, STL, LAS. Checked 6:47 PM ET. For this flight's gate and exact status, check the Southwest app.
Is WN 3936 usually on time?
WN 3936 arrived within 15 minutes of schedule 71% of the time in June-August 2026, with an average delay of 59 minutes when late.
How often is WN 3936 cancelled?
0% of WN 3936 flights were cancelled in June-August 2026.