Flight number record

DL 2591

Delta Air Lines · Minneapolis to Boston

Route: MSP → BOS
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 2591, check with Delta Air Lines.

DL 2591 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 365 flights, with a median arrival 6 minutes early.

The national on-time rate over the same period is 77.6%, so DL 2591 runs 11 points behind the country as a whole. Across a thousand flights that is about 105 extra late arrivals.

On time

67.1%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.81%

1 hour+ late

14.6%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. Beyond the headline rate, 14.6% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 2591 flies

DL 2591 flies MSP to BOS without a single fixed slot. Its most common scheduled departure was 15:15, used on 139 of 365 flights, with 15:20 (66 flights) and 15:50 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:15139 flights38.1%
Departs 15:2066 flights18.1%
Departs 15:5041 flights11.2%

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 2591 runs 5 points worse at 67.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 2591 next to MSP to BOS

Every carrier on MSP to BOS combined arrived on time 78.1% of the time across 1,847 flights, so DL 2591 is 11 points behind it. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 15 points.

DL 2591 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2591	365	67.1%	72 min	0.82%	C+
All Delta Air Lines on MSP–BOS	1,847	78.1%	60 min	1.08%	B
All carriers on MSP–BOS	1,847	78.1%	60 min	1.08%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2591 quarter by quarter

DL 2591 did not run the same all year. Its best quarter was Jan–Mar 2026 at 75.9% on time and its weakest Oct–Dec 2025 at 53.3%, a swing of 23 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 flights64.1%
Oct–Dec 202592 flights53.3%
Jan–Mar 202690 flights75.9%
Apr–Jun 202691 flights75.8%

Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2591 did best on Saturday at 88.5% on time and worst on Friday at 51.9%. Each day rests on about 52 flights, so a gap of 37 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2591 runs late

One category carries most of the weight here. National Airspace System accounts for 59% of the 8,533 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.

National Airspace System
59%
Carrier
29%
Late-arriving aircraft
11%
Extreme weather
1%

59% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 5,060 minutes out of 8,533, against a national NAS share of 21%. The split is drawn from 8,533 delay minutes reported on DL 2591.

Cancellations are rare at 0.82%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.6% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

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 2591 in the data flew MSP to BOS. 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 2591

For a booking, DL 2591 is a flight to put a long connection behind. 14.6% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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