Flight number record
DL 358
Delta Air Lines · Seattle to Tampa
- Route
- SEA → TPA
- Departs
- 11:55
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 358, check with Delta Air Lines.
DL 358 lands a B+, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 363 flights, with a median arrival 3 minutes early.
Key figures
On time
78.7%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
6.4%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 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.
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Schedule
When DL 358 flies
DL 358 flies SEA to TPA without a single fixed slot. Its most common scheduled departure was 11:55, used on 221 of 363 flights, with 11:45 (85 flights) next.
- Departs 11:55221 flights60.9%
- Departs 11:4585 flights23.4%
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 358 runs level with that at 78.7%. 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 358 next to SEA to TPA
Every carrier on SEA to TPA combined arrived on time 80.4% of the time across 975 flights, so DL 358 is 2 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 358thin sample | 363 | 78.7% | 57 min | 0.55% | B+ |
| All Delta Air Lines on SEA–TPAthin sample | 363 | 78.7% | 57 min | 0.55% | B+ |
| All carriers on SEA–TPA | 975 | 80.4% | 52 min | 0.51% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 358 quarter by quarter
DL 358 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 72.1%, a swing of 18 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 flights90.0%
- Oct–Dec 202590 flights75.6%
- Jan–Mar 202690 flights75.3%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights72.1%
Scale runs 65% to 95%.
By weekday, DL 358 did best on Saturday at 88.2% on time and worst on Sunday at 72.0%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 358 runs when it is late
The 76 late arrivals split 29 under half an hour, 24 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early82 flights23.0%
- Within 15 min199 flights55.7%
- 15–29 min late29 flights8.1%
- 30–59 min late24 flights6.7%
- 1–2 hours late16 flights4.5%
- 2+ hours late7 flights2.0%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
A late pushback is often recovered here: of 71 departures that left 15 minutes late or more, 24 still arrived on time. In the other direction, 29 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 TPA.
The worst days
Worst days for DL 358
The latest arrival of the period was on 13 March 2026, 9 hours 17 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across March, September, February and November, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 March 2026 | 9 hours 17 minutes | Extreme weather |
| 29 September 2025 | 2 hours 38 minutes | Carrier |
| 16 March 2026 | 2 hours 29 minutes | Late-arriving aircraft |
| 1 February 2026 | 2 hours 22 minutes | Carrier |
| 17 November 2025 | 2 hours 9 minutes | National Airspace System |
Delay causes
Why DL 358 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,295 reported delay minutes.
- 41%Carrier
- 28%National Airspace System
- 17%Extreme weather
- 14%Late-arriving aircraft
Extreme weather accounts for 17% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.8 times the usual weather exposure. The split is drawn from 4,295 delay minutes reported on DL 358.
Cancellations are rare at 0.55%, 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
6.4% 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 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 358 in the data flew SEA to TPA. 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 358
For a booking, read DL 358 as 78.7% on time with 0.55% cancelled over 363 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to TPA, every carrier and departure
- TPA to SEA, the return direction
- Alaska Airlines 326 on the same route84.7%
- Seattle-Tacoma International (SEA) delay statistics
- Tampa International (TPA) 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.