Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
DL 637 · Chicago (ORD) → Seattle (SEA)
Sold by Delta. Still flying: 47 of the last 56 days (Daily).
Arrives on time60%within 15 minutes, of 98 flights
Cancelled2.0%of scheduled flights
An hour or more late6%of flights that operated
When late, on average50 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Seattle is 2 h behind Chicago).
- Leaves ORD
- 17:55
- Arrives SEA
- 20:34
- Flight time
- 4h 39m
- Days flown, last 8 weeks
- 47 of 56
Each square is a day, Sat Jun 6 to Fri Jul 31, two weeks per row (each column is the same weekday); filled = flew.
How late it arrives
Share of flights that operated arriving more than this late.
Horizontal: minutes late at arrival (0 to 3 hours). Vertical: share of flights later than that.
Its hour at ORD
All flights leaving Chicago (ORD) at 5–6 pm, wherever they’re going: 66% left within 15 minutes and 4.4% were cancelled (20,888 flights in the year). Other Delta flights on this route →
Upcoming forecasts
Our odds that this flight is late or cancelled on the days we publish.