Flight number record

DL 1127

Delta Air Lines · Boston to Minneapolis

Route: BOS → MSP
Departs: 15:15
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.6%. The late ones land roughly 55 minutes behind schedule. That rests on 365 flights, with a median arrival 1 minute early.

On time

74.1%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

1.37%

National rate is 1.81%

1 hour+ late

7.2%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

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 131 of 365 flights, with 15:10 (60 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:15131 flights35.9%
Departs 15:1060 flights16.4%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 72.4%, and DL 1127 runs level with that at 74.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1127 next to BOS to MSP

Every carrier on BOS to MSP combined arrived on time 83.1% of the time across 1,851 flights, so DL 1127 is 9 points behind it. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 8 points.

DL 1127 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1127	365	74.1%	53 min	1.37%	C
All Delta Air Lines on BOS–MSP	1,851	83.1%	63 min	1.19%	B
All carriers on BOS–MSP	1,851	83.1%	63 min	1.19%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 67.4%, a swing of 18 points on roughly 91 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 202592 flights67.4%
Oct–Dec 202592 flights69.2%
Jan–Mar 202690 flights74.1%
Apr–Jun 202691 flights85.7%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1127 ranged from 66.7% on Wednesday to 77.4% on Tuesday. With about 52 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1127 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 4,893 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
45%
Carrier
31%
National Airspace System
23%
Extreme weather
0%

45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,893 reported delay minutes here, that single category outweighs weather by 45 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,893 delay minutes reported on DL 1127.

Cancellations sit at 1.37% against a national 1.81%, which is ordinary. Diversions add another 0.27%.

Connections and routes

What a delay on this flight costs

7.2% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 55 minutes, 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures