No delays reported for WN 3988 (STL→VPS, VPS→HOU, DAL→OKC) as of 6:47 PM ET. It arrived on time 52.3% of the time in June-August 2026. When it was late, the average delay was 51 minutes. 0.8% of flights were cancelled. Right now there are no reported delays at STL, VPS, HOU, DAL, OKC.
May not fly today
Leg 1 of 3 (STL → VPS): Should be in the air from STL, scheduled to land at VPS at 7:15 PM local time. This flight number flew about 3 days a week in June-August 2026, so it may not operate today.
Cancellation risk: Medium 0.8% of its flights were cancelled in June-August 2026; rough weather at OKC.
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 |
|---|---|---|
| STL → VPS St. Louis, MO to Valparaiso, FL | 5:25 PM → 7:15 PM | 43% |
| VPS → HOU Valparaiso, FL to Houston, TX | 8:00 PM → 9:50 PM | 65% |
| DAL → OKC Dallas, TX to Oklahoma City, OK | 9:00 PM → 10:00 PM | 33% |
Local times. Schedules change; check your booking.
How reliable is WN 3988?
| Arrived on time (within 15 min) | 52.3% |
| Average delay when late | 51 min |
| Cancelled | 0.8% |
| Diverted | 0% |
| Flights tracked | 129 |
Best and worst days to fly WN 3988
WN 3988 was most reliable on Tuesdays (69% on time) and least reliable on Saturdays (36%).
| Monday | |
| Tuesday | |
| Wednesday | |
| Thursday | |
| Friday | |
| Saturday | |
| Sunday | Too few flights |
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.
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 3988 delayed today?
Right now there are no reported delays at STL, VPS, HOU, DAL, OKC. Checked 6:47 PM ET. For this flight's gate and exact status, check the Southwest app.
Is WN 3988 usually on time?
WN 3988 arrived within 15 minutes of schedule 52.3% of the time in June-August 2026, with an average delay of 51 minutes when late.
How often is WN 3988 cancelled?
0.8% of WN 3988 flights were cancelled in June-August 2026.