Flight number record
DL 2551
Delta Air Lines · Los Angeles to Portland
- Route
- LAX → PDX
- Departs
- 14:19
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2551, check with Delta Air Lines.
DL 2551 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 349 flights, with a median arrival 14 minutes early.
Set against the rest of the country, DL 2551's record is 10 points better than the US average of 77.3%. That gap is worth roughly 98 fewer late arrivals for every thousand flights.
Key figures
On time
87.1%
Arrivals under 15 minutes late, of 348 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
0.29%
National rate is 1.89%
1 hour+ late
5.7%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. The median arrival is 14 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 2551 flies
DL 2551 flies LAX to PDX without a single fixed slot. Its most common scheduled departure was 14:19, used on 86 of 349 flights, with 14:00 (69 flights) and 14:20 (36 flights) next.
- Departs 14:1986 flights24.6%
- Departs 14:0069 flights19.8%
- Departs 14:2036 flights10.3%
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 14:19 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 2551 runs 15 points better at 87.1%. 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 2551 next to LAX to PDX
Every carrier on LAX to PDX combined arrived on time 86.8% of the time across 4,289 flights, so DL 2551 is about level with it. Delta flew 1,689 flights on the same city pair under all its flight numbers, including this one, and those ran 86.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2551thin sample | 349 | 87.1% | 71 min | 0.29% | A+ |
| All Delta Air Lines on LAX–PDX | 1,689 | 86.6% | 75 min | 0.83% | A+ |
| All carriers on LAX–PDX | 4,289 | 86.8% | 68 min | 0.61% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2551 quarter by quarter
DL 2551 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 80.2%, a swing of 17 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 202580 flights87.3%
- Jan–Mar 202686 flights80.2%
- Apr–Jun 202691 flights90.1%
- Jul–Sep 202662 flights87.1%
Scale runs 70% to 100%.
By weekday, DL 2551 ranged from 83.7% on Sunday to 94.0% on Wednesday. With about 50 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 2551 runs when it is late
DL 2551 often beats the schedule: 160 of 348 completed flights, 46%, arrived 15 minutes or more early. The 45 late arrivals split 12 under half an hour, 13 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early160 flights46.0%
- Within 15 min143 flights41.1%
- 15–29 min late12 flights3.4%
- 30–59 min late13 flights3.7%
- 1–2 hours late10 flights2.9%
- 2+ hours late10 flights2.9%
Scale runs 0% to 100%.
Share of 348 completed flights by arrival against schedule.
9 of 51 late departures made up the time and arrived on time, 18% of them. Only 3 left on time and still arrived late.
The worst days
Worst days for DL 2551
The latest arrival of the period was on 2 October 2025, 3 hours 47 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 |
|---|---|---|
| 2 October 2025 | 3 hours 47 minutes | Carrier |
| 17 January 2026 | 3 hours 10 minutes | Carrier |
| 25 July 2026 | 2 hours 45 minutes | Carrier |
| 16 May 2026 | 2 hours 33 minutes | Carrier |
| 25 November 2025 | 2 hours 29 minutes | Carrier |
Delay causes
Why DL 2551 runs late
Carrier accounts for 71% of the 3,204 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Carrier
- 26%Late-arriving aircraft
- 3%National Airspace System
The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,280 of the 3,204 delay minutes reported here. The split is drawn from 3,204 delay minutes reported on DL 2551.
Cancellations are rare at 0.29%, 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
5.7% 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 a little over an hour, which a normal layover absorbs.
The 833 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
DL 2551 is not only a LAX to PDX flight. It also flew PDX to LAX (347 flights, 88.7% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 349 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| PDX to LAXthin sample | 347 | 88.7% | 93 min | 0.29% | A+ |
What to do with this
Booking DL 2551
For a booking, DL 2551 has one of the better records a US domestic flight can show: 87.1% on time and 0.29% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAX to PDX, every carrier and departure
- PDX to LAX, the return direction
- Delta Air Lines 2766 on the same route88.7%
- Delta Air Lines 2975 on the same route89.5%
- Alaska Airlines 1315 on the same route91.7%
- Alaska Airlines 1397 on the same route88.5%
- Alaska Airlines 668 on the same route94.5%
- Delta Air Lines 2457 on the same route80.9%
- Los Angeles International (LAX) delay statistics
- Portland International (PDX) 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.