Southwest Airlines SEA to PHX on-time performance
Southwest Airlines nonstop flights from Seattle to Phoenix · Aug 2025 – Jul 2026
On-time arrivals
67%
arrived < 15 min late
Cancelled
0.8%
8 flights
Avg arrival delay
18 min
49 min when late
Rank on route
#7 of 7
route average 79% on time
Key facts
- Southwest Airlines flights on SEA to PHX arrived on time 67% of the time in Aug 2025 – Jul 2026.
- 0.8% were cancelled, and 7% arrived an hour or more late.
- That ranks #7 of 7 airlines on this route, which averaged 79% on time overall.
- The largest source of delay minutes was late-arriving aircraft (53%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft53%
- Airline (crew, maintenance, cleaning, fueling)32%
- Air traffic control & airport congestion14%
- Security1%
- Extreme weather0%
Other airlines on SEA to PHX
- Alaska Airlines79% on time · 10 min avg delay
- Delta Air Lines82% on time · 14 min avg delay
- Envoy Air86% on time · 12 min avg delay
- SkyWest Airlines80% on time · 17 min avg delay
- American Airlines86% on time · 12 min avg delay
- Frontier Airlines71% on time · 42 min avg delay
Full SEA to PHX comparison →
Southwest Airlines on-time record across all routes →
1,039 Southwest Airlines flights tracked on this route; 8 cancelled, 4 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.