Flight number record

DL 2055

Delta Air Lines · Seattle to Chicago

Route: SEA → ORD
Departs: 07:10
Flights: 299
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2055, check with Delta Air Lines.

DL 2055 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 55 minutes. That rests on 299 flights, with a median arrival 7 minutes early.

Set against the rest of the country, DL 2055's record is 7 points better than the US average of 77.6%. That gap is worth roughly 68 fewer late arrivals for every thousand flights.

On time

84.4%

Arrivals under 15 minutes late, of 295 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

0.33%

National rate is 1.81%

1 hour+ late

4.4%

National rate is 8.1%

These figures cover 299 flights between July 2025 and June 2026. The median arrival is 7 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 2055 flies

DL 2055 flies SEA to ORD without a single fixed slot. Its most common scheduled departure was 07:10, used on 114 of 299 flights, with 07:20 (58 flights) and 06:10 (30 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:10114 flights38.1%
Departs 07:2058 flights19.4%
Departs 06:1030 flights10.0%

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 07:10 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2055 runs 5 points worse at 84.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 2055 next to SEA to ORD

Every carrier on SEA to ORD combined arrived on time 75.0% of the time across 5,566 flights, so DL 2055 is 9 points ahead of it. Delta flew 902 flights on the same city pair under all its flight numbers, including this one, and those ran 77.5% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 3 points.

DL 2055 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2055thin sample	299	84.4%	54 min	0.33%	B+
All Delta Air Lines on SEA–ORD	902	77.5%	71 min	1.22%	B
All carriers on SEA–ORD	5,566	75.0%	74 min	1.28%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2055 quarter by quarter

DL 2055 did not run the same all year. Its best quarter was Apr–Jun 2026 at 90.8% on time and its weakest Oct–Dec 2025 at 76.2%, a swing of 15 points on roughly 75 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 202584 flights88.1%
Oct–Dec 202581 flights76.2%
Jan–Mar 202655 flights81.8%
Apr–Jun 202679 flights90.8%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2055 did best on Wednesday at 95.7% on time and worst on Sunday at 74.4%. Each day rests on about 43 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2055 runs late

One category carries most of the weight here. Carrier accounts for 47% of the 2,501 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.

Carrier
47%
National Airspace System
45%
Late-arriving aircraft
8%

The largest share of delay minutes, 47%, 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 1,176 of the 2,501 delay minutes reported here. The split is drawn from 2,501 delay minutes reported on DL 2055.

Cancellations are rare at 0.33%, 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

Badly late arrivals are rare here: only 4.4% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

At 1,721 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The same number turns up on one other city pair in the data, including ORD to SEA (66), but none flew often enough under DL 2055 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to ORD only.

One caution: this is a thin sample. 299 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 2055

For a booking, read DL 2055 as 84.4% on time with 0.33% cancelled over 299 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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