Flight number record

DL 2055

Delta Air Lines · Seattle to Chicago

Route: SEA → ORD
Departs: 07:10
Flights: 303
Period: September 2025 to August 2026

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

DL 2055 lands a B+, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 303 flights, with a median arrival 5 minutes early.

Set against the rest of the country, DL 2055's record is 6 points better than the US average of 77.3%. That gap is worth roughly 61 fewer late arrivals for every thousand flights.

On time

83.4%

Arrivals under 15 minutes late, of 295 completed flights

Avg delay

61 min

Across delayed arrivals only, not all flights

Cancelled

0.66%

National rate is 1.89%

1 hour+ late

5.8%

National rate is 8.3%

These figures cover 303 flights between September 2025 and August 2026. The median arrival is 5 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.

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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 97 of 303 flights, with 07:20 (91 flights) and 07:15 (53 flights) next.

Departs 07:1097 flights32.0%
Departs 07:2091 flights30.0%
Departs 07:1553 flights17.5%

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 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 6 points worse at 83.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

DL 2055 next to SEA to ORD

Every carrier on SEA to ORD combined arrived on time 76.7% of the time across 5,538 flights, so DL 2055 is 7 points ahead of it. Delta flew 922 flights on the same city pair under all its flight numbers, including this one, and those ran 75.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 2 points.

DL 2055 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2055thin sample	303	83.4%	61 min	0.66%	B+
All Delta Air Lines on SEA–ORD	922	75.7%	73 min	1.30%	B
All carriers on SEA–ORD	5,538	76.7%	79 min	1.17%	B
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	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 76 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 202526 flights—
Oct–Dec 202581 flights76.2%
Jan–Mar 202655 flights81.8%
Apr–Jun 202679 flights90.8%
Jul–Sep 202662 flights84.5%

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.

Arrival by arrival

How late DL 2055 runs when it is late

DL 2055 often beats the schedule: 89 of 295 completed flights, 30%, arrived 15 minutes or more early. The 49 late arrivals split 20 under half an hour, 12 between 30 and 60 minutes, and 17 an hour or more.

15+ min early89 flights30.2%
Within 15 min157 flights53.2%
15–29 min late20 flights6.8%
30–59 min late12 flights4.1%
1–2 hours late11 flights3.7%
2+ hours late6 flights2.0%

Scale runs 0% to 100%.

Share of 295 completed flights by arrival against schedule.

9 of 43 late departures made up the time and arrived on time, 21% of them. In the other direction, 15 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 ORD.

The worst days

Worst days for DL 2055

The latest arrival of the period was on 11 August 2026, 3 hours 30 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).

The latest arrivals of DL 2055 in the period
Date	Arrived late by	Largest filed cause
11 August 2026	3 hours 30 minutes	National Airspace System
18 September 2025	3 hours 28 minutes	Carrier
27 January 2026	3 hours 18 minutes	Carrier
29 November 2025	2 hours 58 minutes	National Airspace System
15 June 2026	2 hours 32 minutes	Carrier

Delay causes

Why DL 2055 runs late

National Airspace System accounts for 49% of the 2,998 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
49%
Carrier
44%
Late-arriving aircraft
7%

The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,322 of the 2,998 delay minutes reported here. The split is drawn from 2,998 delay minutes reported on DL 2055.

Cancellations are rare at 0.66%, 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

5.8% 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 about an hour, which a normal layover absorbs.

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. 303 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 83.4% on time with 0.66% cancelled over 303 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures