Flight number record
DL 2109
Delta Air Lines · New York to Houston
- Route
- LGA → IAH
- Departs
- 18:29
- Flights
- 326
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2109, check with Delta Air Lines.
DL 2109 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 326 flights, with a median arrival 4 minutes early.
The national on-time rate over the same period is 77.3%, so DL 2109 runs 16 points behind the country as a whole. Across a thousand flights that is about 160 extra late arrivals.
Key figures
On time
61.3%
Arrivals under 15 minutes late, of 310 completed flights
Avg delay
108 min
Across delayed arrivals only, not all flights
Cancelled
4.60%
National rate is 1.89%
1 hour+ late
22.9%
National rate is 8.3%
These figures cover 326 flights between September 2025 and August 2026. Beyond the headline rate, 22.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2109 flies
DL 2109 flies LGA to IAH without a single fixed slot. Its most common scheduled departure was 18:29, used on 130 of 326 flights, with 18:45 (35 flights) and 18:30 (34 flights) next.
- Departs 18:29130 flights39.9%
- Departs 18:4535 flights10.7%
- Departs 18:3034 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 18:29 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 2109 runs 7 points worse at 61.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 2109 next to LGA to IAH
Every carrier on LGA to IAH combined arrived on time 76.2% of the time across 3,997 flights, so DL 2109 is 15 points behind it. Delta flew 1,347 flights on the same city pair under all its flight numbers, including this one, and those ran 74.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 20 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2109thin sample | 326 | 61.3% | 108 min | 4.60% | D− |
| All Delta Air Lines on LGA–IAH | 1,347 | 74.0% | 87 min | 4.53% | C− |
| All carriers on LGA–IAH | 3,997 | 76.2% | 86 min | 2.88% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2109 quarter by quarter
DL 2109 did not run the same all year. Its best quarter was Jan–Mar 2026 at 75.0% on time and its weakest Oct–Dec 2025 at 40.8%, a swing of 34 points on roughly 82 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 202526 flights—
- Oct–Dec 202577 flights40.8%
- Jan–Mar 202677 flights75.0%
- Apr–Jun 202689 flights64.8%
- Jul–Sep 202657 flights56.6%
Scale runs 30% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2109 ranged from 58.0% on Sunday to 68.1% on Friday. With about 47 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 2109 runs when it is late
DL 2109 often beats the schedule: 124 of 310 completed flights, 40%, arrived 15 minutes or more early. When DL 2109 is late it tends to be very late: 71 of its 120 late arrivals were an hour or more behind, and 30 were two hours or more.
- 15+ min early124 flights40.0%
- Within 15 min66 flights21.3%
- 15–29 min late23 flights7.4%
- 30–59 min late26 flights8.4%
- 1–2 hours late41 flights13.2%
- 2+ hours late30 flights9.7%
Scale runs 0% to 100%.
Share of 310 completed flights by arrival against schedule.
21 of 112 late departures made up the time and arrived on time, 19% of them. In the other direction, 29 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at IAH.
The worst days
Worst days for DL 2109
The latest arrival of the period was on 19 December 2025, 16 hours 1 minute behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in December 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 December 2025 | 16 hours 1 minute | Carrier |
| 16 December 2025 | 15 hours 21 minutes | Carrier |
| 2 December 2025 | 12 hours 11 minutes | Carrier |
| 10 August 2026 | 11 hours 44 minutes | Extreme weather |
| 6 August 2026 | 6 hours 3 minutes | National Airspace System |
Delay causes
Why DL 2109 runs late
Carrier accounts for 49% of the 13,000 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 25%Late-arriving aircraft
- 20%National Airspace System
- 6%Extreme weather
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,374 of the 13,000 delay minutes reported here. The split is drawn from 12,910 delay minutes reported on DL 2109.
Cancellations run at 4.60%, against 1.89% nationally. That is roughly one flight in twenty 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
22.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
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.
The same number turns up on three other city pairs in the data, including MSP to RSW (5), RSW to MSP (5) and BOS to CVG (1), but none flew often enough under DL 2109 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. 326 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 2109
For a booking, the cancellation rate is the figure to plan around on DL 2109: 4.60% of its 326 scheduled flights did not operate. A late arrival costs close to two hours, 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
- Delta Air Lines 2930 on the same route71.7%
- Delta Air Lines 2099 on the same route74.4%
- United Airlines 2617 on the same route85.4%
- United Airlines 2371 on the same route91.5%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.