85% of flights from Salt Lake City to Houston arrived on time over the past 12 months. That is better than the typical U.S. route. The 6 a.m. departures ran on time 93% of the time; the 5 p.m. ones 79%. Most reliable airline: United Airlines (87%). 5% 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 SLC → IAH: when a flight was late, it was under 45 minutes late 59% of the time. About 1 in 22 flights landed an hour or more late, and 1 in 87 three hours or more; 0.7% were cancelled outright.
- On time or early85%
- 15–30 min late5.1%
- 30–60 min late4.1%
- 1–2 hours late2.1%
- 2–3 hours late1.3%
- 3+ hours late1.1%
- Diverted0.3%
- Cancelled0.7%
Share of all 2,182 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 | 1,166 | 87% | 1.1% | −12 min | 4.1% | +85 min | United Airlines 73%, Mesa Airlines 21%, SkyWest 5% |
| Delta Air Lines | 1,016 | 83% | 0.2% | −7 min | 5.0% | +77 min | Delta Air Lines |
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 SLC). 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 |
|---|---|---|
| 6 a.m. | 93% | — |
| 7 a.m. | 94% | 90% |
| 9 a.m. | — | 84% |
| 1 p.m. | 81% | 82% |
| 4 p.m. | 89% | — |
| 5 p.m. | — | 78% |
Last flight of the day
On SLC → IAH, each airline's last flight of the day was cancelled 0.5% of the time, against 0.8% for its earlier flights, so here the last flight is actually the safer one. It arrived 3+ hours late 1.7% of the time (earlier flights: 0.9%). 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 | 5:45 p.m. | 0.3% | 2.2% | 0.1% | first flight 9:27 a.m. |
| United Airlines | 5:33 p.m. | 0.8% | 1.1% | 1.3% | first flight 6:45 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.
By month
Each calendar month pooled over 2023–2026. Best: February (89%). Worst: July (73%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 326 | 85% | 0.9% |
| Tuesday | 314 | 88% | 1.0% |
| Wednesday | 315 | 83% | 0.9% |
| Thursday | 317 | 84% | 0.3% |
| Friday | 321 | 88% | 0.6% |
| Saturday | 271 | 86% | 0.7% |
| Sunday | 318 | 85% | 0.3% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 9 · weather 5 · air traffic/airport 1
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 |
|---|---|---|---|---|---|---|
| UA 2366 | 7:00 a.m. | 311 | 93% | 1.6% | −12 min | United Airlines |
| DL 2502 | 7:45 a.m. | 356 | 89% | 0.3% | −11 min | Delta Air Lines |
| UA 497 | 1:00 p.m. | 213 | 79% | 0.9% | −8 min | United Airlines |
| DL 1299 | 1:45 p.m. | 155 | 79% | 0.0% | −7 min | Delta Air Lines |
| DL 2514 | 5:35 p.m. | 365 | 78% | 0.3% | −6 min | Delta Air Lines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Mar 11, 2026 | 7 | 0% | 1 |
| Mar 16, 2026 | 7 | 0% | 1 |
| May 1, 2026 | 6 | 17% | 0 |
| Jul 26, 2026 | 6 | 17% | 0 |
| Nov 30, 2025 | 5 | 20% | 0 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Salt Lake City or Houston. None has been clearly more reliable than SLC → IAH.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| SLC → IAH (this route) | 2,182 | 85% | 0.7% |
| SLC → HOU Salt Lake City to Houston Hobby | 409 | 81% | 0.2% |
Questions
How often are flights from SLC to IAH on time?
85% of 2,182 scheduled flights from Salt Lake City, UT to Houston, TX arrived within 15 minutes of schedule between September 2025 and August 2026. 0.7% were cancelled.
What is the best time of day to fly SLC to IAH?
Flights scheduled to leave at 6 a.m. were the most reliable (93% on time). The 5 p.m. departures were the least (79%).
Which airline is most on time from SLC to IAH?
United Airlines: 87% of its 1,166 flights on the route arrived on time. Delta Air Lines: 83%.
What month has the most delays from SLC to IAH?
July (73% on time). The best month is February (89%), over 2023–2026.
Is the last flight of the day from SLC to IAH more likely to be cancelled?
No, the opposite. Each airline's last SLC–IAH flight of the day was cancelled 0.5% of the time over the past year, against 0.8% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- IAH → SLC (return)
- Salt Lake City (SLC) delays by hour
- Flights into Houston Bush Intercontinental (IAH)
- United Airlines on-time record
- Delta Air Lines 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.