Flight number record

DL 877

Delta Air Lines · Minneapolis to Seattle

Route: MSP → SEA
Departs: 15:15
Flights: 356
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 877, check with Delta Air Lines.

DL 877 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land roughly 50 minutes behind schedule. That rests on 356 flights, with a median arrival right on schedule.

The national on-time rate over the same period is 77.3%, so DL 877 runs 6 points behind the country as a whole. Across a thousand flights that is about 56 extra late arrivals.

On time

71.7%

Arrivals under 15 minutes late, of 353 completed flights

Avg delay

51 min

Across delayed arrivals only, not all flights

Cancelled

0.84%

National rate is 1.89%

1 hour+ late

7.4%

National rate is 8.3%

These figures cover 356 flights between September 2025 and August 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.

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Schedule

When DL 877 flies

DL 877 flies MSP to SEA without a single fixed slot. Its most common scheduled departure was 15:15, used on 77 of 356 flights, with 14:55 (40 flights) and 14:04 (36 flights) next.

Departs 15:1577 flights21.6%
Departs 14:5540 flights11.2%
Departs 14:0436 flights10.1%

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 877 runs level with that at 71.7%. 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 877 next to MSP to SEA

Every carrier on MSP to SEA combined arrived on time 80.9% of the time across 2,676 flights, so DL 877 is 9 points behind it. Delta flew 1,745 flights on the same city pair under all its flight numbers, including this one, and those ran 80.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 9 points.

DL 877 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 877thin sample	356	71.7%	51 min	0.84%	C+
All Delta Air Lines on MSP–SEA	1,745	80.6%	59 min	0.86%	B+
All carriers on MSP–SEA	2,676	80.9%	62 min	0.97%	B+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 877 quarter by quarter

DL 877 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Oct–Dec 2025 at 61.1%, a swing of 36 points on roughly 71 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 flights96.7%
Oct–Dec 202592 flights61.1%
Jan–Mar 202688 flights75.9%
Apr–Jun 202689 flights74.2%
Jul–Sep 202657 flights64.9%

Scale runs 55% to 100%.

By weekday, DL 877 did best on Tuesday at 82.4% on time and worst on Sunday at 61.2%. Each day rests on about 51 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 877 runs when it is late

The 100 late arrivals split 48 under half an hour, 26 between 30 and 60 minutes, and 26 an hour or more.

15+ min early72 flights20.4%
Within 15 min181 flights51.3%
15–29 min late48 flights13.6%
30–59 min late26 flights7.4%
1–2 hours late20 flights5.7%
2+ hours late6 flights1.7%

Scale runs 0% to 100%.

Share of 353 completed flights by arrival against schedule.

15 of 80 late departures made up the time and arrived on time, 19% of them. In the other direction, 35 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 SEA.

The worst days

Worst days for DL 877

The latest arrival of the period was on 19 December 2025, 7 hours 1 minute behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across December, March, April and May, with no single month standing out.

The latest arrivals of DL 877 in the period
Date	Arrived late by	Largest filed cause
19 December 2025	7 hours 1 minute	Extreme weather
13 March 2026	5 hours 3 minutes	National Airspace System
17 April 2026	3 hours 11 minutes	Late-arriving aircraft
23 May 2026	2 hours 28 minutes	Carrier
12 December 2025	2 hours 12 minutes	Carrier

Delay causes

Why DL 877 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 5,114 reported delay minutes.

Carrier
33%
National Airspace System
32%
Late-arriving aircraft
26%
Extreme weather
9%

32% 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 1,650 minutes out of 5,114, against a national NAS share of 21%. The split is drawn from 5,114 delay minutes reported on DL 877.

Cancellations are rare at 0.84%, below the national 1.89% 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

7.4% 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 roughly 50 minutes, which a normal layover absorbs.

The 1,399 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 356 flights under DL 877 in the data flew MSP to SEA. 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. 356 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 877

For a booking, DL 877 is one of the weaker ways to fly MSP to SEA: 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures