74% of flights from New York to Houston arrived on time over the past 12 months. That is worse than the typical U.S. route. The 6 a.m. departures ran on time 87% of the time; the 6 p.m. ones 59%. Most reliable airline: United Airlines (76%). 13% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for LGA → IAH: when a flight was late, it was under 45 minutes late 49% of the time. About 1 in 11 flights landed an hour or more late, and 1 in 40 three hours or more; 3.4% were cancelled outright.
- On time or early74%
- 15–30 min late7.1%
- 30–60 min late5.8%
- 1–2 hours late4.8%
- 2–3 hours late2.1%
- 3+ hours late2.5%
- Diverted0.4%
- Cancelled3.4%
Share of all 4,267 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| United Airlines | 2,678 | 76% | 2.7% | −11 min | 8.6% | +88 min | United Airlines 89%, Mesa Airlines 10%, SkyWest 1% |
| Delta Air Lines | 1,347 | 70% | 4.5% | −11 min | 11.5% | +87 min | Delta Air Lines |
| Spirit Airlines | 242 | 72% | 4.5% | −14 min | 7.9% | +67 min | Spirit Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at LGA). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | United Airlines | Delta Air Lines | Spirit Airlines |
|---|---|---|---|
| 6 a.m. | 89% | 83% | — |
| 7 a.m. | 87% | — | — |
| 9 a.m. | 85% | — | — |
| 10 a.m. | 78% | 68% | — |
| 11 a.m. | — | — | 63% |
| noon | 85% | — | — |
| 1 p.m. | — | 69% | — |
| 2 p.m. | 74% | — | — |
| 3 p.m. | 63% | — | — |
| 5 p.m. | 63% | — | — |
| 6 p.m. | — | 59% | — |
| 8 p.m. | 63% | — | — |
Last flight of the day
On LGA → IAH, each airline's last flight of the day was cancelled 4.7% of the time, against 3.1% for its earlier flights (1.5× as often). It arrived 3+ hours late 3.0% of the time (earlier flights: 2.5%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| Delta Air Lines | 6:29 p.m. | 4.4% | 3.9% | 4.6% | first flight 7:05 a.m. |
| United Airlines | 8:17 p.m. | 4.9% | 2.2% | 2.3% | first flight 6:00 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
If you need to be in IAH tonight, book an earlier flight so there's a backup if it's cancelled.
By month
Each calendar month pooled over 2023–2026. Best: November (84%). Worst: July (63%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 667 | 70% | 5.5% |
| Tuesday | 656 | 78% | 3.5% |
| Wednesday | 646 | 75% | 3.1% |
| Thursday | 639 | 74% | 2.0% |
| Friday | 648 | 78% | 1.8% |
| Saturday | 408 | 74% | 3.7% |
| Sunday | 603 | 68% | 4.0% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 75 · air traffic/airport 36 · airline 33
Month by month
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| DL 2140 | 6:00 a.m. | 230 | 81% | 8.3% | −17 min | Delta Air Lines |
| UA 2371 | 7:45 a.m. | 263 | 90% | 1.9% | −19 min | United Airlines |
| UA 2617 | 9:55 a.m. | 326 | 82% | 3.1% | −15 min | United Airlines |
| DL 2099 | 10:10 a.m. | 332 | 70% | 4.5% | −7 min | Delta Air Lines |
| DL 2930 | 1:45 p.m. | 349 | 69% | 2.9% | −10 min | Delta Air Lines |
| UA 1794 | 3:38 p.m. | 154 | 60% | 1.9% | +4 min | United Airlines |
| DL 2109 | 6:29 p.m. | 326 | 58% | 4.6% | −3 min | Delta Air Lines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Mar 16, 2026 | 13 | 0% | 3 |
| Feb 23, 2026 | 13 | 0% | 13 |
| May 1, 2026 | 13 | 0% | 1 |
| Dec 14, 2025 | 12 | 0% | 2 |
| Jan 25, 2026 | 11 | 0% | 10 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of New York or Houston. EWR → IAH has been 5 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| LGA → IAH (this route) | 4,267 | 74% | 3.4% |
| EWR → IAH Newark to Houston Bush Intercontinental | 3,714 | 78% | 2.0% |
| LGA → HOU LaGuardia to Houston Hobby | 1,359 | 69% | 3.7% |
| JFK → IAH New York JFK to Houston Bush Intercontinental | 475 | 68% | 4.6% |
Questions
How often are flights from LGA to IAH on time?
74% of 4,267 scheduled flights from New York, NY to Houston, TX arrived within 15 minutes of schedule between September 2025 and August 2026. 3.4% were cancelled.
What is the best time of day to fly LGA to IAH?
Flights scheduled to leave at 6 a.m. were the most reliable (87% on time). The 6 p.m. departures were the least (59%).
Which airline is most on time from LGA to IAH?
United Airlines: 76% of its 2,678 flights on the route arrived on time. Delta Air Lines: 70%. Spirit Airlines: 72%.
What month has the most delays from LGA to IAH?
July (63% on time). The best month is November (84%), over 2023–2026.
Is the last flight of the day from LGA to IAH more likely to be cancelled?
Yes. Each airline's last LGA–IAH flight of the day was cancelled 4.7% of the time over the past year, against 3.1% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- IAH → LGA (return)
- LaGuardia (LGA) delays by hour
- Flights into Houston Bush Intercontinental (IAH)
- United Airlines on-time record
- Delta Air Lines on-time record
- Spirit Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.