Flight OddsAS631 SLC → SEA
Alaska Airlines · Salt Lake City, UT to Seattle, WA · 97 flights observed, 2025-07-15 to 2025-10-25 · 689 mi
AS631 covers more than one route in the data window — the stats below are for SLC → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
76%
Median delay
-7 min
90th percentile
+47 min
Cancellation rate
2%
How often is AS631 on time?
Across 97 flights on SLC → SEA from 2025-07-15 to 2025-10-25, AS631 arrived within 15 minutes of schedule 76% of the time. The median arrival delay was -7 min, and the worst 10% of flights arrived +47 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 72 | 76% |
| 16-30 min | 9 | 9% |
| 31-60 min | 10 | 11% |
| 61-120 min | 4 | 4% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 17 | 59% | +17 min |
| 2025-08 | 29 | 62% | +11 min |
| 2025-09 | 26 | 92% | -8 min |
| 2025-10 | 23 | 87% | -2 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 14 | 71% |
| Tue | 15 | 73% |
| Wed | 14 | 71% |
| Thu | 15 | 80% |
| Fri | 15 | 67% |
| Sat | 9 | 78% |
| Sun | 13 | 92% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…