Flight OddsDL637 SEA → ORD
Delta Air Lines · Seattle, WA to Chicago, IL · 76 flights observed, 2026-04-13 to 2026-06-30 · 1,721 mi
DL637 covers more than one route in the data window — the stats below are for SEA → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
74%
Median delay
+2 min
90th percentile
+35 min
Cancellation rate
3%
How often is DL637 on time?
Across 76 flights on SEA → ORD from 2026-04-13 to 2026-06-30, DL637 arrived within 15 minutes of schedule 74% of the time. The median arrival delay was +2 min, and the worst 10% of flights arrived +35 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 | 54 | 74% |
| 16-30 min | 10 | 14% |
| 31-60 min | 5 | 7% |
| 61-120 min | 4 | 5% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 16 | 63% | +14 min |
| 2026-05 | 29 | 66% | +10 min |
| 2026-06 | 28 | 89% | -3 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 12 | 50% |
| Tue | 12 | 92% |
| Wed | 10 | 70% |
| Thu | 9 | 78% |
| Fri | 11 | 73% |
| Sat | 8 | 100% |
| Sun | 11 | 64% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…