Flight number record
DL 1019
Delta Air Lines · Boston to Detroit
- Route
- BOS → DTW
- Departs
- 05:30
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1019, check with Delta Air Lines.
DL 1019 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 365 flights, with a median arrival 16 minutes early.
Set against the rest of the country, DL 1019's record is 17 points better than the US average of 77.3%. That gap is worth roughly 168 fewer late arrivals for every thousand flights.
Key figures
On time
94.1%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
118 min
Across delayed arrivals only, not all flights
Cancelled
2.47%
National rate is 1.89%
1 hour+ late
3.4%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 16 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When DL 1019 flies
DL 1019 flies BOS to DTW without a single fixed slot. Its most common scheduled departure was 05:30, used on 161 of 365 flights, with 05:29 (99 flights) and 05:40 (57 flights) next.
- Departs 05:30161 flights44.1%
- Departs 05:2999 flights27.1%
- Departs 05:4057 flights15.6%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 05:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1019 runs 5 points better at 94.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 1019 next to BOS to DTW
Every carrier on BOS to DTW combined arrived on time 75.7% of the time across 2,575 flights, so DL 1019 is 18 points ahead of it. Delta flew 1,718 flights on the same city pair under all its flight numbers, including this one, and those ran 78.1% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1019 | 365 | 94.1% | 118 min | 2.47% | A |
| All Delta Air Lines on BOS–DTW | 1,718 | 78.1% | 79 min | 2.21% | B |
| All carriers on BOS–DTW | 2,575 | 75.7% | 78 min | 2.80% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1019 quarter by quarter
Quarter by quarter DL 1019 held fairly steady: 100.0% in Jul–Sep 2025, 93.3% in Oct–Dec 2025, 91.8% in Jan–Mar 2026, 95.6% in Apr–Jun 2026 and 93.3% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202592 flights93.3%
- Jan–Mar 202690 flights91.8%
- Apr–Jun 202691 flights95.6%
- Jul–Sep 202662 flights93.3%
Scale runs 85% to 100%.
By weekday, DL 1019 ranged from 92.0% on Monday to 98.0% on Friday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1019 runs when it is late
DL 1019 often beats the schedule: 203 of 355 completed flights, 57%, arrived 15 minutes or more early. When DL 1019 is late it tends to be very late: 12 of its 21 late arrivals were an hour or more behind, and 9 were two hours or more.
- 15+ min early203 flights57.2%
- Within 15 min131 flights36.9%
- 15–29 min late7 flights2.0%
- 30–59 min late2 flights0.6%
- 1–2 hours late3 flights0.8%
- 2+ hours late9 flights2.5%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
Only 19 of 355 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for DL 1019
The latest arrival of the period was on 14 January 2026, 7 hours 5 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 January 2026 | 7 hours 5 minutes | Carrier |
| 5 November 2025 | 5 hours 1 minute | Carrier |
| 29 August 2026 | 4 hours 10 minutes | Carrier |
| 27 November 2025 | 4 hours 2 minutes | Carrier |
| 12 March 2026 | 3 hours 49 minutes | Carrier |
Delay causes
Why DL 1019 runs late
Carrier accounts for 84% of the 2,482 delay minutes carriers reported here, and the remaining four split what is left.
- 84%Carrier
- 16%National Airspace System
The largest share of delay minutes, 84%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,085 of the 2,482 delay minutes reported here. The split is drawn from 2,482 delay minutes reported on DL 1019.
Cancellations sit at 2.47% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.4% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 632 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 365 flights under DL 1019 in the data flew BOS to DTW. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 365 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking DL 1019
For a booking, read DL 1019 as 94.1% on time with 2.47% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BOS to DTW, every carrier and departure
- DTW to BOS, the return direction
- Delta Air Lines 1748 on the same route86.9%
- Delta Air Lines 2222 on the same route80.7%
- Delta Air Lines 1432 on the same route68.6%
- Boston Logan International (BOS) delay statistics
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.