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Flight Reliability

WN 343 · Southwest Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and WN 343 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

76%
Arrive within 15 minutes
6 min
Average arrival delay
1.5%
Cancelled
6 min early
Median arrival delay

Based on 340 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(48 flights)
  • Tue81%(41 flights)
  • Wed91%(42 flights)
  • Thu77%(51 flights)
  • Fri74%(53 flights)
  • Sat76%(38 flights)
  • Sun70%(60 flights)
On-time by departure window
  • 3–6 AM92%(12 flights)
  • 6–9 AM96%(82 flights)
  • 9 AM–12 PM89%(26 flights)
  • 12–3 PM75%(28 flights)
  • 3–6 PM91%(54 flights)
  • 6–9 PM53%(131 flights)
On-time trend by month
63%
May

Jun 81% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202581%16
July 202567%18
August 202590%31
September 202580%30
October 202594%31
November 202578%27
December 202548%29
January 2026100%22
February 202681%32
March 202678%23
April 202661%33
May 202663%41
Departures on time
75%
Diverted
0.6%
Flights flown
333
Months covered
12

Keep nerding

Based on 340 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.