Flight number record

DL 877

Delta Air Lines · Minneapolis to Seattle

Route: MSP → SEA
Departs: 14:55
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 361 flights, with a median arrival 3 minutes early.

On time

75.9%

Arrivals under 15 minutes late, of 357 completed flights

Avg delay

55 min

Across delayed arrivals only, not all flights

Cancelled

0.83%

National rate is 1.81%

1 hour+ late

7.3%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 2026. The median arrival is 3 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When DL 877 flies

DL 877 flies MSP to SEA without a single fixed slot. Its most common scheduled departure was 14:55, used on 61 of 361 flights, with 14:25 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:5561 flights16.9%
Departs 14:2541 flights11.4%

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 14:55 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 877 runs 4 points better at 75.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 877 next to MSP to SEA

Every carrier on MSP to SEA combined arrived on time 81.1% of the time across 2,690 flights, so DL 877 is 5 points behind it. Delta flew 1,737 flights on the same city pair under all its flight numbers, including this one, and those ran 82.1% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 6 points.

DL 877 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 877thin sample	361	75.9%	55 min	0.83%	B+
All Delta Air Lines on MSP–SEA	1,737	82.1%	60 min	0.92%	B+
All carriers on MSP–SEA	2,690	81.1%	58 min	1.04%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 92.3% on time and its weakest Oct–Dec 2025 at 61.1%, a swing of 31 points on roughly 90 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 flights92.3%
Oct–Dec 202592 flights61.1%
Jan–Mar 202688 flights75.9%
Apr–Jun 202689 flights74.2%

Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 877 did best on Tuesday at 84.3% on time and worst on Friday at 71.2%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

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 4,733 reported delay minutes.

Carrier
35%
National Airspace System
31%
Late-arriving aircraft
25%
Extreme weather
9%

The largest share of delay minutes, 35%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,638 of the 4,733 delay minutes reported here. The split is drawn from 4,733 delay minutes reported on DL 877.

Cancellations are rare at 0.83%, 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

7.3% 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 about an hour, 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. 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 361 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. 361 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: 5 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