IAH to SLC flight delays & on-time performance
Nonstop flights from George Bush Intercontinental Airport to Salt Lake City International Airport · 1,195 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAH or SLC right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Houston (IAH) to Salt Lake City (SLC) arrived on time 83% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.5% were cancelled, and 6% arrived an hour or more late.
- United Airlines was the most punctual airline here (84% on time); Delta Air Lines was the least (83%).
- Departures scheduled around 2pm did best (88% on time); around 7pm did worst (76%).
- Thursday was the most reliable day to fly (87% on time) and Sunday the least (78%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (45%).
Which airline is most on time from IAH to SLC?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 84% | 0.6% | 11 min | 5.0% | 874 |
| Delta Air Lines | 83% | 0.3% | 16 min | 6.5% | 1,012 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 77% | 1.6% | 15 min | 8.1% | 63 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am85%365 flights
- 8am100%24 flights
- 9am85%344 flights
- 11am87%191 flights
- 12pm85%190 flights
- 2pm88%69 flights
- 4pm85%73 flights
- 6pm86%94 flights
- 7pm76%299 flights
- 8pm77%274 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday81%1.4% cancelled
- Tuesday86%0.7% cancelled
- Wednesday81%0.0% cancelled
- Thursday87%0.4% cancelled
- Friday82%0.0% cancelled
- Saturday86%0.4% cancelled
- Sunday78%0.4% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)45%
- Late-arriving aircraft38%
- Air traffic control & airport congestion13%
- Extreme weather5%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather56%
- Airline (crew, maintenance, cleaning, fueling)33%
- Air traffic control & airport congestion11%
- Security0%
IAH to SLC: common questions
- How often are IAH to SLC flights on time?
- 83% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Houston to Salt Lake City cancelled?
- 0.5% of scheduled flights were cancelled (9 of 1,949).
- How long are typical delays?
- Across all flights the average arrival delay was 14 min (early arrivals count as zero). Flights that were late arrived 75 min behind schedule on average, and 5.8% of flights were an hour or more late.
- How long is taxi time at IAH?
- Flights on this route spent 20 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SLC to IAH — 86% on time
More flights from Houston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAH → SLC, nonstop flights by US airlines that report to the DOT. How we calculate this.