Likely delayed: there are delays at WN 343's airports as of 6:47 PM ET. It arrived on time 69.7% of the time in June-August 2026. When it was late, the average delay was 57 minutes. 0.9% of flights were cancelled. AUS has major delays (runway construction, max 3 hours and 3 minutes), so this flight is likely to be delayed.
Likely delayed
Leg 3 of 3 (AUS → LAS): Likely delayed: AUS has major delays (runway construction, max 3 hours and 3 minutes). Scheduled to leave at 6:55 PM local time. This flight number flew about 2 days a week in June-August 2026, so it may not operate today.
Cancellation risk: High 0.9% of its flights were cancelled in June-August 2026; AUS has major delays; rough weather at AUS.
Estimate from the schedule, live position and airport conditions, if this flight operates today. Check Southwest for official times.
Book a backup seat TPA → LASThis flight is cancelled often; a refundable backup costs little
What to do now
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Route and schedule
| Leg | Scheduled | On time |
|---|---|---|
| TPA → SJU Tampa, FL to San Juan, PR | 6:35 AM → 9:30 AM | 89% |
| PWM → BWI Portland, ME to Baltimore, MD | 1:05 PM → 2:45 PM | 80% |
| AUS → LAS Austin, TX to Las Vegas, NV | 6:55 PM → 7:50 PM | 38% |
Local times. Schedules change; check your booking.
How reliable is WN 343?
| Arrived on time (within 15 min) | 69.7% |
| Average delay when late | 57 min |
| Cancelled | 0.9% |
| Diverted | 0.9% |
| Flights tracked | 111 |
Best and worst days to fly WN 343
WN 343 was most reliable on Sundays (92% on time) and least reliable on Mondays (58%).
| Monday | |
| Tuesday | |
| Wednesday | |
| Thursday | |
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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 TPA → SJU
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 343 delayed today?
AUS has major delays (runway construction, max 3 hours and 3 minutes), so this flight is likely to be delayed. Checked 6:47 PM ET. For this flight's gate and exact status, check the Southwest app.
Is WN 343 usually on time?
WN 343 arrived within 15 minutes of schedule 69.7% of the time in June-August 2026, with an average delay of 57 minutes when late.
How often is WN 343 cancelled?
0.9% of WN 343 flights were cancelled in June-August 2026.