Flight number record
DL 2099
Delta Air Lines · New York to Houston
- Route
- LGA → IAH
- Departs
- 10:10
- Flights
- 341
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2099, check with Delta Air Lines.
DL 2099 sits in the middle of the pack with a B−. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 341 flights, with a median arrival 12 minutes early.
Key figures
On time
75.7%
Arrivals under 15 minutes late, of 325 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
4.11%
National rate is 1.81%
1 hour+ late
8.3%
National rate is 8.1%
These figures cover 341 flights between July 2025 and June 2026. Beyond the headline rate, 8.3% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When DL 2099 flies
DL 2099 flies LGA to IAH without a single fixed slot. Its most common scheduled departure was 10:10, used on 112 of 341 flights, with 10:15 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 10:10112 flights32.8%
- Departs 10:1537 flights10.9%
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 10:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 2099 runs 8 points worse at 75.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
DL 2099 next to LGA to IAH
Every carrier on LGA to IAH combined arrived on time 76.5% of the time across 4,060 flights, so DL 2099 is about level with it. Delta flew 1,342 flights on the same city pair under all its flight numbers, including this one, and those ran 74.5% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2099thin sample | 341 | 75.7% | 67 min | 4.11% | B− |
| All Delta Air Lines on LGA–IAH | 1,342 | 74.5% | 85 min | 3.73% | C− |
| All carriers on LGA–IAH | 4,060 | 76.5% | 85 min | 2.59% | B |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 2099 quarter by quarter
DL 2099 did not run the same all year. Its best quarter was Jan–Mar 2026 at 83.1% on time and its weakest Oct–Dec 2025 at 63.4%, a swing of 20 points on roughly 85 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 202592 flights81.5%
- Oct–Dec 202589 flights63.4%
- Jan–Mar 202672 flights83.1%
- Apr–Jun 202688 flights75.6%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2099 did best on Saturday at 86.7% on time and worst on Sunday at 68.6%. Each day rests on about 49 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 2099 runs late
One category carries most of the weight here. Carrier accounts for 57% of the 5,308 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.
- 57%Carrier
- 22%National Airspace System
- 21%Late-arriving aircraft
The largest share of delay minutes, 57%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,032 of the 5,308 delay minutes reported here. The split is drawn from 5,308 delay minutes reported on DL 2099.
Cancellations run at 4.11%, against 1.81% nationally. That is about one flight in 25 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
8.3% 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 about an hour, which a normal layover absorbs.
The 1,416 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on one other city pair in the data, including IAH to LGA (70), but none flew often enough under DL 2099 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LGA to IAH only.
One caution: this is a thin sample. 341 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 2099
For a booking, the cancellation rate is the figure to plan around on DL 2099: 4.11% of its 341 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- LGA to IAH, every carrier and departure
- IAH to LGA, the return direction
- United Airlines 2617 on the same route84.9%
- Delta Air Lines 2109 on the same route61.5%
- Delta Air Lines 2930 on the same route73.0%
- United Airlines 2371 on the same route93.6%
- LaGuardia (LGA) delay statistics
- George Bush Intercontinental (IAH) 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
- What a cancellation rate actually tells you (and what it hides)
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.