About 1 in 4 DL 5619 flights from Boston arrived 15+ minutes late, diverted or cancelled over the past year (28%); 6.2% were cancelled. The typical flight landed 6 minutes early.
DL 5619: BOS → MKE
Scheduled to leave Boston at 8:45 p.m. local time, operated by Republic Airways as YX 5619. Over the past year it arrived on time 72% of the time (292 flights), in line with other DL flights on the route at that hour (73%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Boston to Milwaukee (68% of days). Delta Air Lines's last BOS–MKE flight was cancelled 5.0% of the time, against 2.0% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 9:10 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 49 | 67% |
| Tuesday | 47 | 68% |
| Wednesday | 47 | 81% |
| Thursday | 47 | 72% |
| Friday | 45 | 73% |
| Saturday | 10 | — |
| Sunday | 47 | 68% |
Why it was late
All flights BOS → MKE · Connecting off DL 5619? Check the risk
DL 5619: MKE → BOS
Scheduled to leave Milwaukee at 6:55 p.m. local time, operated by Republic Airways as YX 5619. Over the past year it arrived on time 72% of the time (229 flights), in line with other DL flights on the route at that hour (74%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Milwaukee to Boston (87% of days). Delta Air Lines's last MKE–BOS flight was cancelled 4.5% of the time, against 2.5% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 11:34 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 40 | 70% |
| Tuesday | 38 | 74% |
| Wednesday | 38 | 71% |
| Thursday | 37 | 73% |
| Friday | 36 | 72% |
| Saturday | 1 | — |
| Sunday | 39 | 72% |
Why it was late
All flights MKE → BOS · Connecting off DL 5619? Check the risk
Questions
How often is DL 5619 from BOS to MKE late?
Delta Air Lines 5619 from Boston, MA to Milwaukee, WI arrived 15 or more minutes late, was diverted or was cancelled on 28% of 292 scheduled flights between September 2025 and August 2026. 6.2% were cancelled.
How often is DL 5619 from MKE to BOS late?
Delta Air Lines 5619 from Milwaukee, WI to Boston, MA arrived 15 or more minutes late, was diverted or was cancelled on 28% of 229 scheduled flights between September 2025 and August 2026. 4.8% 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.