About 1 in 6 DL 3740 flights from Boise arrived 15+ minutes late, diverted or cancelled over the past year (18%); 0.0% were cancelled. The typical flight landed 14 minutes early.
DL 3740: BOI → SEA
Scheduled to leave Boise at 9:00 a.m. local time, operated by SkyWest as OO 3740. Over the past year it arrived on time 82% of the time (346 flights), in line with other DL flights on the route at that hour (81%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 86% |
| Tuesday | 50 | 88% |
| Wednesday | 50 | 86% |
| Thursday | 50 | 76% |
| Friday | 50 | 80% |
| Saturday | 47 | 74% |
| Sunday | 48 | 83% |
Why it was late
All flights BOI → SEA · Connecting off DL 3740? Check the risk
Questions
How often is DL 3740 from BOI to SEA late?
Delta Air Lines 3740 from Boise, ID to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 18% of 346 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.