Flight number record
DL 338
Delta Air Lines · Seattle to Fort Lauderdale
- Route
- SEA → FLL
- Departs
- 11:55
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 338, check with Delta Air Lines.
DL 338 sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land roughly 45 minutes behind schedule. That rests on 364 flights, with a median arrival 2 minutes early.
Key figures
On time
75.3%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.89%
1 hour+ late
5.6%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 2 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 338 flies
DL 338 flies SEA to FLL without a single fixed slot. Its most common scheduled departure was 11:55, used on 96 of 364 flights, with 11:59 (92 flights) and 13:00 (56 flights) next.
- Departs 11:5596 flights26.4%
- Departs 11:5992 flights25.3%
- Departs 13:0056 flights15.4%
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 11:55 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 338 runs 3 points worse at 75.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 338 next to SEA to FLL
Every carrier on SEA to FLL combined arrived on time 78.6% of the time across 826 flights, so DL 338 is 3 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 338thin sample | 364 | 75.3% | 47 min | 1.37% | B |
| All Delta Air Lines on SEA–FLLthin sample | 364 | 75.3% | 47 min | 1.37% | B |
| All carriers on SEA–FLL | 826 | 78.6% | 45 min | 0.73% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 338 quarter by quarter
DL 338 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jan–Mar 2026 at 63.2%, a swing of 30 points on roughly 73 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 flights93.3%
- Oct–Dec 202591 flights72.7%
- Jan–Mar 202690 flights63.2%
- Apr–Jun 202691 flights78.9%
- Jul–Sep 202662 flights82.0%
Scale runs 55% to 100%.
By weekday, DL 338 did best on Wednesday at 88.5% on time and worst on Sunday at 66.0%. Each day rests on about 52 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 338 runs when it is late
Most of the lateness is short. 44 of the 88 late arrivals were under half an hour behind, and 20 reached an hour or more.
- 15+ min early81 flights22.8%
- Within 15 min187 flights52.5%
- 15–29 min late44 flights12.4%
- 30–59 min late24 flights6.7%
- 1–2 hours late14 flights3.9%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
18 of 73 late departures made up the time and arrived on time, 25% of them. In the other direction, 33 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 FLL.
The worst days
Worst days for DL 338
The latest arrival of the period was on 13 December 2025, 3 hours 53 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 December 2025 | 3 hours 53 minutes | Carrier |
| 25 January 2026 | 3 hours 50 minutes | Late-arriving aircraft |
| 30 August 2026 | 2 hours 30 minutes | Carrier |
| 25 July 2026 | 2 hours 25 minutes | Carrier |
| 16 July 2026 | 2 hours 6 minutes | Late-arriving aircraft |
Delay causes
Why DL 338 runs late
Carrier accounts for 43% of the 4,122 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 29%National Airspace System
- 28%Late-arriving aircraft
The largest share of delay minutes, 43%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,785 of the 4,122 delay minutes reported here. The split is drawn from 4,122 delay minutes reported on DL 338.
Cancellations sit at 1.37% against a national 1.89%, which is ordinary. Diversions add another 0.82%.
Connections and routes
What a delay on this flight costs
5.6% 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 roughly 45 minutes, which a normal layover absorbs.
At 2,717 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 FLL to SEA (35), but none flew often enough under DL 338 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to FLL only.
One caution: this is a thin sample. 364 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 338
For a booking, read DL 338 as 75.3% on time with 1.37% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to FLL, every carrier and departure
- FLL to SEA, the return direction
- Alaska Airlines 516 on the same route83.0%
- Seattle-Tacoma International (SEA) delay statistics
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.