Flight number record

DL 448

Delta Air Lines · Seattle to Orlando

Route: SEA → MCO
Departs: 23:15
Flights: 354
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 448, check with Delta Air Lines.

DL 448 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 35 minutes. That rests on 354 flights, with a median arrival 3 minutes early.

Set against the rest of the country, DL 448's record is 7 points better than the US average of 77.6%. That gap is worth roughly 65 fewer late arrivals for every thousand flights.

On time

84.1%

Arrivals under 15 minutes late, of 352 completed flights

Avg delay

34 min

Across delayed arrivals only, not all flights

Cancelled

0.56%

National rate is 1.81%

1 hour+ late

1.4%

National rate is 8.1%

These figures cover 354 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 448 flies

DL 448 flies SEA to MCO without a single fixed slot. Its most common scheduled departure was 23:15, used on 61 of 354 flights, with 23:20 (60 flights) and 23:25 (50 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 23:1561 flights17.2%
Departs 23:2060 flights16.9%
Departs 23:2550 flights14.1%

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 23:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 448 runs 14 points better at 84.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 448 next to SEA to MCO

Every carrier on SEA to MCO combined arrived on time 81.0% of the time across 1,820 flights, so DL 448 is 3 points ahead of it. Delta flew 719 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 3 points.

DL 448 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 448thin sample	354	84.1%	34 min	0.56%	B+
All Delta Air Lines on SEA–MCO	719	79.6%	59 min	1.53%	B
All carriers on SEA–MCO	1,820	81.0%	50 min	0.82%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 448 quarter by quarter

DL 448 did not run the same all year. Its best quarter was Jan–Mar 2026 at 90.5% on time and its weakest Jul–Sep 2025 at 72.8%, a swing of 18 points on roughly 89 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 flights72.8%
Oct–Dec 202586 flights84.7%
Jan–Mar 202685 flights90.5%
Apr–Jun 202691 flights89.0%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 448 did best on Monday at 90.4% on time and worst on Friday at 78.0%. Each day rests on about 51 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 448 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 49% of the 1,920 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.

Late-arriving aircraft
49%
National Airspace System
25%
Carrier
24%
Extreme weather
2%

49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 1,920 reported delay minutes here, that single category outweighs weather by 29 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 1,920 delay minutes reported on DL 448.

Cancellations are rare at 0.56%, 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 1.4% 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 2,554 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 354 flights under DL 448 in the data flew SEA to MCO. 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. 354 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 448

For a booking, read DL 448 as 84.1% on time with 0.56% cancelled over 354 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