Flight number record
DL 1127
Delta Air Lines · Boston to Minneapolis
- Route
- BOS → MSP
- Departs
- 15:15
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1127, check with Delta Air Lines.
DL 1127 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 365 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so DL 1127 runs 5 points behind the country as a whole. Across a thousand flights that is about 46 extra late arrivals.
Key figures
On time
72.7%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.89%
1 hour+ late
8.9%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 8.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1127 flies
DL 1127 flies BOS to MSP without a single fixed slot. Its most common scheduled departure was 15:15, used on 96 of 365 flights, with 15:00 (63 flights) and 15:10 (60 flights) next.
- Departs 15:1596 flights26.3%
- Departs 15:0063 flights17.3%
- Departs 15:1060 flights16.4%
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 15:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 1127 runs level with that at 72.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 1127 next to BOS to MSP
Every carrier on BOS to MSP combined arrived on time 82.0% of the time across 1,853 flights, so DL 1127 is 9 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1127 | 365 | 72.7% | 60 min | 1.37% | C |
| All Delta Air Lines on BOS–MSP | 1,853 | 82.0% | 70 min | 1.35% | B |
| All carriers on BOS–MSP | 1,853 | 82.0% | 70 min | 1.35% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1127 quarter by quarter
DL 1127 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.7% on time and its weakest Jul–Sep 2025 at 56.7%, a swing of 29 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights56.7%
- Oct–Dec 202592 flights69.2%
- Jan–Mar 202690 flights74.1%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights64.5%
Scale runs 50% to 90%.
By weekday, DL 1127 ranged from 67.3% on Monday to 76.9% on Tuesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1127 runs when it is late
The 98 late arrivals split 44 under half an hour, 22 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early85 flights23.7%
- Within 15 min176 flights49.0%
- 15–29 min late44 flights12.3%
- 30–59 min late22 flights6.1%
- 1–2 hours late18 flights5.0%
- 2+ hours late14 flights3.9%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
17 of 87 late departures made up the time and arrived on time, 20% of them. In the other direction, 28 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MSP.
The worst days
Worst days for DL 1127
The latest arrival of the period was on 28 July 2026, 6 hours 12 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 July 2026 | 6 hours 12 minutes | National Airspace System |
| 6 September 2025 | 4 hours 34 minutes | National Airspace System |
| 11 July 2026 | 3 hours 53 minutes | Late-arriving aircraft |
| 6 August 2026 | 3 hours 39 minutes | National Airspace System |
| 7 September 2025 | 3 hours 33 minutes | Late-arriving aircraft |
Delay causes
Why DL 1127 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 5,867 reported delay minutes.
- 40%Late-arriving aircraft
- 33%National Airspace System
- 27%Carrier
- 1%Extreme weather
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,867 reported delay minutes here, that single category outweighs weather by 40 to one. The split is drawn from 5,867 delay minutes reported on DL 1127.
Cancellations sit at 1.37% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
8.9% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 1,124 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 1127 in the data flew BOS to MSP. 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 1127
For a booking, DL 1127 is one of the weaker ways to fly BOS to MSP: 9 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- BOS to MSP, every carrier and departure
- MSP to BOS, the return direction
- Delta Air Lines 1098 on the same route70.6%
- Delta Air Lines 1103 on the same route83.8%
- Delta Air Lines 2303 on the same route93.6%
- Boston Logan International (BOS) delay statistics
- Minneapolis-St Paul International (MSP) 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
- Why the first flight of the morning is statistically safest
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.