Flight number record

DL 448

Delta Air Lines · Seattle to Orlando

Route: SEA → MCO
Departs: 23:15
Flights: 354
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs roughly 35 minutes. That rests on 354 flights, with a median arrival 4 minutes early.

Set against the rest of the country, DL 448's record is 7 points better than the US average of 77.3%. That gap is worth roughly 74 fewer late arrivals for every thousand flights.

On time

84.7%

Arrivals under 15 minutes late, of 352 completed flights

Avg delay

37 min

Across delayed arrivals only, not all flights

Cancelled

0.56%

National rate is 1.89%

1 hour+ late

2.0%

National rate is 8.3%

These figures cover 354 flights between September 2025 and August 2026. The median arrival is 4 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 448 flies

DL 448 flies SEA to MCO without a single fixed slot. Its most common scheduled departure was 23:15, used on 117 of 354 flights, with 23:20 (60 flights) and 23:25 (50 flights) next.

Departs 23:15117 flights33.1%
Departs 23:2060 flights16.9%
Departs 23:2550 flights14.1%

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 23:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 448 runs 15 points better at 84.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

DL 448 next to SEA to MCO

Every carrier on SEA to MCO combined arrived on time 82.1% of the time across 1,818 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 79.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 4 points.

DL 448 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 448thin sample	354	84.7%	37 min	0.56%	B+
All Delta Air Lines on SEA–MCO	719	79.7%	58 min	1.39%	B
All carriers on SEA–MCO	1,818	82.1%	49 min	0.72%	B+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	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 2026 at 72.6%, a swing of 18 points on roughly 71 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 202530 flights80.0%
Oct–Dec 202586 flights84.7%
Jan–Mar 202685 flights90.5%
Apr–Jun 202691 flights89.0%
Jul–Sep 202662 flights72.6%

Scale runs 65% to 95%.

By weekday, DL 448 did best on Tuesday at 92.0% on time and worst on Sunday at 80.0%. Each day rests on about 51 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 448 runs when it is late

Most of the lateness is short. 30 of the 54 late arrivals were under half an hour behind, and 7 reached an hour or more.

15+ min early69 flights19.6%
Within 15 min229 flights65.1%
15–29 min late30 flights8.5%
30–59 min late17 flights4.8%
1–2 hours late6 flights1.7%
2+ hours late1 flights0.3%

Scale runs 0% to 100%.

Share of 352 completed flights by arrival against schedule.

A late pushback is often recovered here: of 69 departures that left 15 minutes late or more, 33 still arrived on time. In the other direction, 18 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 MCO.

The worst days

Worst days for DL 448

The latest arrival of the period was on 13 March 2026, 2 hours 45 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.

The latest arrivals of DL 448 in the period
Date	Arrived late by	Largest filed cause
13 March 2026	2 hours 45 minutes	Late-arriving aircraft
12 March 2026	1 hour 40 minutes	Late-arriving aircraft
7 July 2026	1 hour 24 minutes	Late-arriving aircraft
10 October 2025	1 hour 18 minutes	Late-arriving aircraft
14 December 2025	1 hour 12 minutes	Late-arriving aircraft

Delay causes

Why DL 448 runs late

Late-arriving aircraft accounts for 47% of the 1,996 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
47%
Carrier
27%
National Airspace System
24%
Extreme weather
2%

47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,996 reported delay minutes here, that single category outweighs weather by 30 to one. The split is drawn from 1,996 delay minutes reported on DL 448.

Cancellations are rare at 0.56%, 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

Badly late arrivals are rare here: only 2.0% land an hour or more behind schedule, against 8.3% 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 84.7% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures