Flight number record
DL 2591
Delta Air Lines · Minneapolis to Boston
- Route
- MSP → BOS
- 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 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 4 minutes early.
The national on-time rate over the same period is 77.3%, so DL 2591 runs 12 points behind the country as a whole. Across a thousand flights that is about 122 extra late arrivals.
Key figures
On time
65.1%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
16.6%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 16.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 124 of 365 flights, with 15:20 (52 flights) and 15:50 (41 flights) next.
- Departs 15:15124 flights34.0%
- Departs 15:2052 flights14.2%
- Departs 15:5041 flights11.2%
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 2591 runs 7 points worse at 65.1%. 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 2591 next to MSP to BOS
Every carrier on MSP to BOS combined arrived on time 76.4% of the time across 1,849 flights, so DL 2591 is 11 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2591 | 365 | 65.1% | 78 min | 1.10% | C |
| All Delta Air Lines on MSP–BOS | 1,849 | 76.4% | 61 min | 1.19% | B |
| All carriers on MSP–BOS | 1,849 | 76.4% | 61 min | 1.19% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 Jul–Sep 2025 at 40.0%, a swing of 36 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 flights40.0%
- Oct–Dec 202592 flights53.3%
- Jan–Mar 202690 flights75.9%
- Apr–Jun 202691 flights75.8%
- Jul–Sep 202662 flights63.9%
Scale runs 30% to 80%.
By weekday, DL 2591 did best on Saturday at 88.2% on time and worst on Friday at 55.8%. Each day rests on about 52 flights, so a gap of 32 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2591 runs when it is late
DL 2591 often beats the schedule: 116 of 361 completed flights, 32%, arrived 15 minutes or more early. The 126 late arrivals split 33 under half an hour, 33 between 30 and 60 minutes, and 60 an hour or more.
- 15+ min early116 flights32.1%
- Within 15 min119 flights33.0%
- 15–29 min late33 flights9.1%
- 30–59 min late33 flights9.1%
- 1–2 hours late36 flights10.0%
- 2+ hours late24 flights6.6%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 121 departures that left 15 minutes late or more, only 14 made it up before arrival. In the other direction, 19 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 BOS.
The worst days
Worst days for DL 2591
The latest arrival of the period was on 14 July 2026, 6 hours 22 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 July 2026 | 6 hours 22 minutes | Carrier |
| 16 March 2026 | 5 hours 8 minutes | National Airspace System |
| 14 October 2025 | 4 hours 29 minutes | National Airspace System |
| 6 November 2025 | 4 hours 16 minutes | National Airspace System |
| 26 November 2025 | 4 hours 9 minutes | Carrier |
Delay causes
Why DL 2591 runs late
National Airspace System accounts for 58% of the 9,764 delay minutes carriers reported here, and the remaining four split what is left.
- 58%National Airspace System
- 30%Carrier
- 10%Late-arriving aircraft
- 1%Extreme weather
58% 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 5,702 minutes out of 9,764, against a national NAS share of 21%. The split is drawn from 9,764 delay minutes reported on DL 2591.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
16.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
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. 16.6% 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.
Related
Where to go next
- MSP to BOS, every carrier and departure
- BOS to MSP, the return direction
- Delta Air Lines 2655 on the same route81.6%
- Delta Air Lines 2649 on the same route89.5%
- Delta Air Lines 2614 on the same route76.7%
- Delta Air Lines 2558 on the same route70.0%
- Minneapolis-St Paul International (MSP) delay statistics
- Boston Logan International (BOS) 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
- How often a connection fails at the major US hubs
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.