Flight number record

DL 1090

Delta Air Lines · Tampa to Seattle

Route: TPA → SEA
Departs: 08:05
Flights: 363
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1090, check with Delta Air Lines.

DL 1090 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 363 flights, with a median arrival 6 minutes early.

Set against the rest of the country, DL 1090's record is 9 points better than the US average of 77.6%. That gap is worth roughly 90 fewer late arrivals for every thousand flights.

On time

86.6%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

68 min

Across delayed arrivals only, not all flights

Cancelled

0.83%

National rate is 1.81%

1 hour+ late

3.9%

National rate is 8.1%

These figures cover 363 flights between July 2025 and June 2026. The median arrival is 6 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 1090 flies

DL 1090 flies TPA to SEA without a single fixed slot. Its most common scheduled departure was 08:05, used on 74 of 363 flights, with 08:10 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:0574 flights20.4%
Departs 08:1040 flights11.0%

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 08:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1090 runs 3 points better at 86.6%. 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 1090 next to TPA to SEA

Every carrier on TPA to SEA combined arrived on time 74.9% of the time across 976 flights, so DL 1090 is 12 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 5 points.

DL 1090 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1090thin sample	363	86.6%	68 min	0.83%	A+
All Delta Air Lines on TPA–SEAthin sample	363	86.6%	68 min	0.83%	A+
All carriers on TPA–SEA	976	74.9%	54 min	0.82%	C+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1090 quarter by quarter

DL 1090 did not run the same all year. Its best quarter was Oct–Dec 2025 at 90.9% on time and its weakest Jan–Mar 2026 at 79.5%, a swing of 11 points on roughly 91 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 flights85.9%
Oct–Dec 202590 flights90.9%
Jan–Mar 202690 flights79.5%
Apr–Jun 202691 flights90.1%

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

By weekday, DL 1090 did best on Sunday at 92.2% on time and worst on Tuesday at 79.2%. 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 1090 runs late

One category carries most of the weight here. Carrier accounts for 62% of the 3,238 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
62%
National Airspace System
25%
Late-arriving aircraft
14%

The largest share of delay minutes, 62%, 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 1,998 of the 3,238 delay minutes reported here. The split is drawn from 3,238 delay minutes reported on DL 1090.

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

Badly late arrivals are rare here: only 3.9% 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 2,520 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.

Every one of the 363 flights under DL 1090 in the data flew TPA 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. 363 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 1090

For a booking, DL 1090 has one of the better records a US domestic flight can show: 86.6% on time and 0.83% cancelled. That is a base rate, not a promise about any single 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