Route on-time record
IAH to SLC: most on-time flights and the best time to fly
Houston (George Bush Intercontinental Airport) to Salt Lake City (Salt Lake City International Airport). 1,965 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was United 492 at 12:06 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAH → SLC
Houston to Salt Lake City: 1,965 nonstop flights a year
On time (12 months)
82%
Cancelled
0.6%
avg delay 14 min
Best time to leave
9 AM to noon
87% on time vs 76% 6 to 9 PM
Most reliable airline
Delta
82% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · United 492
12:06 PM → 2:36 PM3h 30m nonstop
Local times, typical schedule. Last flown 2026-03-28.
88%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 96% of the time (24 flights, Jun 2025 to May 2026).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find United 492 fares Opens this date on Aviasales#2 · United 2242
9:35 AM → 11:56 AM3h 21m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 1.1%
- Avg arrival delay
- 7 min
- Arrived on time 88% of the time (342 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 87% on time; 6 to 9 PM: 76%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 342 flights
Find United 2242 fares Opens this date on Aviasales#3 · Delta 1532
12:41 PM → 3:06 PM3h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.6%
- Avg arrival delay
- 10 min
- Arrived on time 85% of the time (325 flights, Jun 2025 to May 2026).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- 58% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 325 flights
Find Delta 1532 fares Opens this date on Aviasales#4 · Delta 1583
7:35 AM → 10:00 AM3h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.3%
- Avg arrival delay
- 19 min
- Arrived on time 83% of the time (364 flights, Jun 2025 to May 2026).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 364 flights
Find Delta 1583 fares Opens this date on Aviasales#5 · Delta 2376
7:59 PM → 10:15 PM3h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 81% of the time (21 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 76% on time; 9 AM to noon: 87%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
- Short track record (21 flights), so its score leans on the airline's record at this hour.
Limited track record · 21 flights
Find Delta 2376 fares Opens this date on Aviasales#6 · SkyWest 5257 · sold as United Express, Delta Connection, American Eagle or Alaska
4:30 PM → 7:08 PM3h 38m nonstop
Local times, typical schedule. Last flown 2026-03-28.
78%
chance on time
- On time (history)
- 80%
- Cancelled
- 2.2%
- Avg arrival delay
- 17 min
- Arrived on time 80% of the time (44 flights, Jun 2025 to May 2026).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Short track record (44 flights), so its score leans on the airline's record at this hour.
Limited track record · 44 flights
Find 4:30 PM flight fares Opens this date on Aviasales#7 · United 2157
8:08 PM → 10:30 PM3h 24m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 80%
- Cancelled
- 1.1%
- Avg arrival delay
- 14 min
- Arrived on time 80% of the time (281 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 76% on time; 9 AM to noon: 87%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 281 flights
Find United 2157 fares Opens this date on Aviasales#8 · Delta 1299
7:10 PM → 9:34 PM3h 23m nonstop
Local times, typical schedule. Last flown 2026-05-30.
78%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.0%
- Avg arrival delay
- 26 min
- Arrived on time 77% of the time (172 flights, Jun 2025 to May 2026).
- Never cancelled in 174 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 76% on time; 9 AM to noon: 87%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Moderate track record · 172 flights
Find Delta 1299 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines82%
1,011 flights · 82% on time as flown · 0.3% cancel
- United Airlines82%
886 flights · 83% on time as flown · 0.9% cancel
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)79%
68 flights · 79% on time as flown · 0.9% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM84%
388 flights · avg delay 18 min
- 9 AM to noon87%
596 flights · avg delay 8 min
- Noon to 3 PM86%
227 flights · avg delay 9 min
- 3 to 6 PM85%
87 flights · avg delay 11 min
- 6 to 9 PM76%
667 flights · avg delay 21 min
Best day: Thursday (83%). Worst: Sunday (79%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)46%
- Late-arriving aircraft37%
- Air traffic control and airport volume12%
- Severe weather5%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
IAH to SLC questions
- What time of day is best to fly IAH to SLC?
- 9 AM to noon: 87% of flights arrived on time, against 76% for departures 6 to 9 PM.
- Which airline is most on time from IAH to SLC?
- Delta, with a season-adjusted 82% chance of operating and arriving on time over 1,011 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on IAH to SLC?
- May (73% on time); the best was February (87%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from IAH
- SLC to IAH (return)
- IAH to ORD 75%
- IAH to DFW 75%
- IAH to LAX 83%
- IAH to ATL 77%
- IAH to DEN 81%
- IAH to LGA 72%
- IAH to EWR 74%
- IAH to MIA 78%
- IAH to MCO 81%
- IAH to SFO 79%
- IAH to LAS 82%
- IAH to DCA 75%
Live status: FAA delays and ground stops