Flight number record

DL 1311

Delta Air Lines · West Palm Beach to Atlanta

Route: PBI → ATL
Departs: 11:00
Flights: 334
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1311, check with Delta Air Lines.

DL 1311 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 334 flights, with a median arrival 10 minutes early.

Set against the rest of the country, DL 1311's record is 9 points better than the US average of 77.3%. That gap is worth roughly 89 fewer late arrivals for every thousand flights.

On time

86.2%

Arrivals under 15 minutes late, of 325 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

2.69%

National rate is 1.89%

1 hour+ late

4.9%

National rate is 8.3%

These figures cover 334 flights between September 2025 and August 2026. The median arrival is 10 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 1311 flies

DL 1311 flies PBI to ATL without a single fixed slot. Its most common scheduled departure was 11:00, used on 108 of 334 flights, with 11:03 (61 flights) and 11:01 (38 flights) next.

Departs 11:00108 flights32.3%
Departs 11:0361 flights18.3%
Departs 11:0138 flights11.4%

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 11:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1311 runs 8 points better at 86.2%. 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 1311 next to PBI to ATL

Every carrier on PBI to ATL combined arrived on time 82.7% of the time across 3,475 flights, so DL 1311 is 4 points ahead of it. Delta flew 3,402 flights on the same city pair under all its flight numbers, including this one, and those ran 83.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 5 points.

DL 1311 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1311thin sample	334	86.2%	63 min	2.69%	A
All Delta Air Lines on PBI–ATL	3,402	83.6%	64 min	1.59%	B
All carriers on PBI–ATL	3,475	82.7%	67 min	1.61%	B
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 1311 quarter by quarter

DL 1311 did not run the same all year. Its best quarter was Jul–Sep 2026 at 93.5% on time and its weakest Apr–Jun 2026 at 81.8%, a swing of 12 points on roughly 67 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 202592 flights88.8%
Jan–Mar 202690 flights82.8%
Apr–Jun 202691 flights81.8%
Jul–Sep 202631 flights93.5%

Scale runs 75% to 100%.

By weekday, DL 1311 did best on Wednesday at 93.8% on time and worst on Friday at 80.0%. Each day rests on about 48 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 1311 runs when it is late

DL 1311 often beats the schedule: 109 of 325 completed flights, 34%, arrived 15 minutes or more early. The 45 late arrivals split 17 under half an hour, 12 between 30 and 60 minutes, and 16 an hour or more.

15+ min early109 flights33.5%
Within 15 min171 flights52.6%
15–29 min late17 flights5.2%
30–59 min late12 flights3.7%
1–2 hours late8 flights2.5%
2+ hours late8 flights2.5%

Scale runs 0% to 100%.

Share of 325 completed flights by arrival against schedule.

6 of 37 late departures made up the time and arrived on time, 16% of them. 14 flights left on time and still arrived late.

The worst days

Worst days for DL 1311

The latest arrival of the period was on 30 April 2026, 4 hours 8 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in March 2026.

The latest arrivals of DL 1311 in the period
Date	Arrived late by	Largest filed cause
30 April 2026	4 hours 8 minutes	Late-arriving aircraft
17 March 2026	3 hours 40 minutes	Late-arriving aircraft
23 March 2026	3 hours 17 minutes	Late-arriving aircraft
14 March 2026	2 hours 52 minutes	Late-arriving aircraft
17 July 2026	2 hours 26 minutes	Carrier

Delay causes

Why DL 1311 runs late

Late-arriving aircraft accounts for 63% of the 2,854 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
63%
National Airspace System
19%
Carrier
17%
Extreme weather
1%

63% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,854 reported delay minutes here, that single category outweighs weather by 46 to one. The split is drawn from 2,854 delay minutes reported on DL 1311.

Cancellations run at 2.69%, against 1.89% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.9% 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.

The 545 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 1311 is not only a PBI to ATL flight. It also flew ATL to PBI (330 flights, 88.8% 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. 334 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.

Other routes flown as DL 1311
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
ATL to PBIthin sample	330	88.8%	64 min	2.12%	A

What to do with this

Booking DL 1311

For a booking, the cancellation rate is the figure to plan around on DL 1311: 2.69% of its 334 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.

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