About 1 in 4 DL 4129 flights from Minneapolis arrived 15+ minutes late, diverted or cancelled over the past year (24%); 2.0% were cancelled. The typical flight landed 10 minutes early.
DL 4129: MSP → IAD
Scheduled to leave Minneapolis at 7:50 p.m. local time, operated by SkyWest as OO 4129. Over the past year it arrived on time 76% of the time (253 flights), in line with other DL flights on the route at that hour (79%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Minneapolis to Washington (91% of days). Delta Air Lines's last MSP–IAD flight was cancelled 1.2% of the time, against 0.8% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 7:17 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 73% |
| Tuesday | 36 | 69% |
| Wednesday | 35 | 74% |
| Thursday | 36 | 75% |
| Friday | 36 | 81% |
| Saturday | 37 | 84% |
| Sunday | 36 | 75% |
Why it was late
All flights MSP → IAD · Connecting off DL 4129? Check the risk
Questions
How often is DL 4129 from MSP to IAD late?
Delta Air Lines 4129 from Minneapolis, MN to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 24% of 253 scheduled flights between September 2025 and August 2026. 2.0% 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.