Flight OddsDL1521 LAS → SEA
Delta Air Lines · Las Vegas, NV to Seattle, WA · 31 flights observed, 2026-03-08 to 2026-04-12 · 867 mi
DL1521 covers more than one route in the data window — the stats below are for LAS → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
83%
Median delay
-11 min
90th percentile
+31 min
Cancellation rate
3%
How often is DL1521 on time?
Across 31 flights on LAS → SEA from 2026-03-08 to 2026-04-12, DL1521 arrived within 15 minutes of schedule 83% of the time. The median arrival delay was -11 min, and the worst 10% of flights arrived +31 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 25 | 83% |
| 16-30 min | 2 | 7% |
| 31-60 min | 1 | 3% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 2 | 7% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 20 | 80% | +35 min |
| 2026-04 | 10 | 90% | -14 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 75% |
| Tue | 5 | 80% |
| Wed | 5 | 80% |
| Thu | 5 | 100% |
| Fri | 5 | 60% |
| Sat | No data | — |
| Sun | 6 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…