Flight number record
DL 1099
Delta Air Lines · Tampa to Atlanta
- Route
- TPA → ATL
- Departs
- 13:45
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1099, check with Delta Air Lines.
DL 1099 lands a B, 4 points 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 an hour and a half on average. That rests on 364 flights, with a median arrival 9 minutes early.
Key figures
On time
81.2%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
2.20%
National rate is 1.89%
1 hour+ late
8.1%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 8.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When DL 1099 flies
DL 1099 flies TPA to ATL without a single fixed slot. Its most common scheduled departure was 13:45, used on 116 of 364 flights, with 13:44 (52 flights) and 13:52 (38 flights) next.
- Departs 13:45116 flights31.9%
- Departs 13:4452 flights14.3%
- Departs 13:5238 flights10.4%
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 13:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1099 runs 3 points better at 81.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 1099 next to TPA to ATL
Every carrier on TPA to ATL combined arrived on time 79.6% of the time across 6,200 flights, so DL 1099 is 2 points ahead of it. Delta flew 4,451 flights on the same city pair under all its flight numbers, including this one, and those ran 81.4% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1099thin sample | 364 | 81.2% | 83 min | 2.20% | B |
| All Delta Air Lines on TPA–ATL | 4,451 | 81.4% | 80 min | 1.39% | B |
| All carriers on TPA–ATL | 6,200 | 79.6% | 74 min | 1.44% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1099 quarter by quarter
DL 1099 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jul–Sep 2026 at 68.9%, 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 flights86.7%
- Oct–Dec 202591 flights84.6%
- Jan–Mar 202690 flights82.4%
- Apr–Jun 202691 flights83.1%
- Jul–Sep 202662 flights68.9%
Scale runs 60% to 90%.
By weekday, DL 1099 did best on Wednesday at 88.5% on time and worst on Sunday at 69.4%. Each day rests on about 52 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1099 runs when it is late
DL 1099 often beats the schedule: 106 of 356 completed flights, 30%, arrived 15 minutes or more early. The 67 late arrivals split 18 under half an hour, 20 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early106 flights29.8%
- Within 15 min183 flights51.4%
- 15–29 min late18 flights5.1%
- 30–59 min late20 flights5.6%
- 1–2 hours late18 flights5.1%
- 2+ hours late11 flights3.1%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
16 of 68 late departures made up the time and arrived on time, 24% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for DL 1099
The latest arrival of the period was on 7 December 2025, 11 hours 31 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 11 hours 31 minutes | National Airspace System |
| 16 June 2026 | 6 hours 48 minutes | Carrier |
| 23 February 2026 | 5 hours 27 minutes | Carrier |
| 3 July 2026 | 4 hours 43 minutes | Carrier |
| 30 July 2026 | 4 hours 4 minutes | Late-arriving aircraft |
Delay causes
Why DL 1099 runs late
Late-arriving aircraft accounts for 45% of the 5,590 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 34%National Airspace System
- 20%Carrier
- 1%Extreme weather
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,590 reported delay minutes here, that single category outweighs weather by 45 to one. The split is drawn from 5,590 delay minutes reported on DL 1099.
Cancellations sit at 2.20% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
8.1% 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 an hour and a half, which a normal layover absorbs.
DL 1099 is not only a TPA to ATL flight. It also flew ATL to TPA (363 flights, 83.7% 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. 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| ATL to TPAthin sample | 363 | 83.7% | 60 min | 1.93% | B |
What to do with this
Booking DL 1099
For a booking, read DL 1099 as 81.2% on time with 2.20% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- TPA to ATL, every carrier and departure
- ATL to TPA, the return direction
- Delta Air Lines 1227 on the same route86.6%
- Delta Air Lines 1587 on the same route77.0%
- Delta Air Lines 759 on the same route68.1%
- Delta Air Lines 744 on the same route89.1%
- Delta Air Lines 1525 on the same route72.2%
- Frontier Airlines 3053 on the same route64.4%
- Tampa International (TPA) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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
- Why the first flight of the morning is statistically safest
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.