Flight number record
DL 354
Delta Air Lines · Raleigh to Seattle
- Route
- RDU → SEA
- Departs
- 07:36
- Flights
- 348
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 354, check with Delta Air Lines.
DL 354 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That rests on 348 flights, with a median arrival 7 minutes early.
Set against the rest of the country, DL 354's record is 6 points better than the US average of 77.3%. That gap is worth roughly 62 fewer late arrivals for every thousand flights.
Key figures
On time
83.5%
Arrivals under 15 minutes late, of 340 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
1.15%
National rate is 1.89%
1 hour+ late
4.4%
National rate is 8.3%
These figures cover 348 flights between September 2025 and August 2026. The median arrival is 7 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 354 flies
DL 354 flies RDU to SEA without a single fixed slot. Its most common scheduled departure was 07:36, used on 58 of 348 flights, with 06:38 (57 flights) and 07:15 (37 flights) next.
- Departs 07:3658 flights16.7%
- Departs 06:3857 flights16.4%
- Departs 07:1537 flights10.6%
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 07:36 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 354 runs 6 points worse at 83.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 354 next to RDU to SEA
Every carrier on RDU to SEA combined arrived on time 78.0% of the time across 918 flights, so DL 354 is 6 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 354thin sample | 348 | 83.5% | 51 min | 1.15% | B |
| All Delta Air Lines on RDU–SEAthin sample | 364 | 82.8% | 49 min | 1.37% | B |
| All carriers on RDU–SEA | 918 | 78.0% | 51 min | 1.20% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 354 quarter by quarter
DL 354 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jan–Mar 2026 at 75.0%, a swing of 22 points on roughly 70 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 flights96.7%
- Oct–Dec 202579 flights79.5%
- Jan–Mar 202686 flights75.0%
- Apr–Jun 202691 flights83.3%
- Jul–Sep 202662 flights93.5%
Scale runs 65% to 100%.
By weekday, DL 354 did best on Tuesday at 90.0% on time and worst on Monday at 66.7%. Each day rests on about 50 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 354 runs when it is late
DL 354 often beats the schedule: 103 of 340 completed flights, 30%, arrived 15 minutes or more early. The 56 late arrivals split 24 under half an hour, 17 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early103 flights30.3%
- Within 15 min181 flights53.2%
- 15–29 min late24 flights7.1%
- 30–59 min late17 flights5.0%
- 1–2 hours late9 flights2.6%
- 2+ hours late6 flights1.8%
Scale runs 0% to 100%.
Share of 340 completed flights by arrival against schedule.
7 of 36 late departures made up the time and arrived on time, 19% of them. In the other direction, 27 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 SEA.
The worst days
Worst days for DL 354
The latest arrival of the period was on 27 February 2026, 2 hours 58 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 February 2026 | 2 hours 58 minutes | Carrier |
| 2 February 2026 | 2 hours 19 minutes | Carrier |
| 12 January 2026 | 2 hours 8 minutes | Carrier |
| 18 October 2025 | 2 hours 4 minutes | Carrier |
| 10 November 2025 | 2 hours 3 minutes | Carrier |
Delay causes
Why DL 354 runs late
Carrier accounts for 53% of the 2,842 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Carrier
- 44%National Airspace System
- 2%Late-arriving aircraft
- 1%Extreme weather
44% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,261 minutes out of 2,842, against a national NAS share of 21%. The split is drawn from 2,842 delay minutes reported on DL 354.
Cancellations sit at 1.15% against a national 1.89%, which is ordinary. Diversions add another 1.15%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.4% 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 2,354 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 three other city pairs in the data, including ATL to ICT (12), ICT to ATL (12) and PBI to ATL (4), but none flew often enough under DL 354 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to RDU to SEA only.
One caution: this is a thin sample. 348 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 354
For a booking, read DL 354 as 83.5% on time with 1.15% cancelled over 348 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- RDU to SEA, every carrier and departure
- SEA to RDU, the return direction
- Alaska Airlines 572 on the same route72.0%
- Raleigh-Durham International (RDU) delay statistics
- Seattle-Tacoma International (SEA) 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.