Flight number record

DL 1099

Delta Air Lines · Tampa to Atlanta

Route: TPA → ATL
Departs: 13:45
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1099, check with Delta Air Lines.

DL 1099 lands a B, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 364 flights, with a median arrival 9 minutes early.

Set against the rest of the country, DL 1099's record is 5 points better than the US average of 77.6%. That gap is worth roughly 45 fewer late arrivals for every thousand flights.

On time

82.1%

Arrivals under 15 minutes late, of 357 completed flights

Avg delay

88 min

Across delayed arrivals only, not all flights

Cancelled

1.92%

National rate is 1.81%

1 hour+ late

7.6%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. The median arrival is 9 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.

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 13:47 (60 flights) and 13:52 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:45116 flights31.9%
Departs 13:4760 flights16.5%
Departs 13:5238 flights10.4%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 78.8%, and DL 1099 runs 3 points better at 82.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1099 next to TPA to ATL

Every carrier on TPA to ATL combined arrived on time 79.9% of the time across 6,138 flights, so DL 1099 is 2 points ahead of it. Delta flew 4,413 flights on the same city pair under all its flight numbers, including this one, and those ran 81.7% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 1099 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1099thin sample	364	82.1%	88 min	1.92%	B
All Delta Air Lines on TPA–ATL	4,413	81.7%	75 min	1.22%	B
All carriers on TPA–ATL	6,138	79.9%	71 min	1.25%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1099 quarter by quarter

Quarter by quarter DL 1099 held fairly steady: 78.3% in Jul–Sep 2025, 84.6% in Oct–Dec 2025, 82.4% in Jan–Mar 2026 and 83.1% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights78.3%
Oct–Dec 202591 flights84.6%
Jan–Mar 202690 flights82.4%
Apr–Jun 202691 flights83.1%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1099 did best on Wednesday at 88.5% on time and worst on Sunday at 73.5%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1099 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 5,639 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
43%
Carrier
26%
National Airspace System
25%
Extreme weather
5%

43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 5,639 reported delay minutes here, that single category outweighs weather by 8 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 5,639 delay minutes reported on DL 1099.

Cancellations sit at 1.92% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

7.6% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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, 83.8% 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. 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.

Other routes flown as DL 1099
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
ATL to TPAthin sample	363	83.8%	60 min	1.65%	B

What to do with this

Booking DL 1099

For a booking, read DL 1099 as 82.1% on time with 1.92% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures