Route profile
SAT→SLC
Flight reliability, delays and best times to fly from San Antonio to Salt Lake City, 1,087 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 83% of comparable major US routes (4,598 compared)
Calculated from 3,144 flights. How this is calculated · What counts as on time
SAT → SLC arrives on time 86.0% of the time; the return trip, SLC → SAT, arrives on time 82.9% of the time, a 3.1-point gap between the two directions of the same city pair.
SAT → SLC spends 21.5 minutes on the ground on a 1,087-mile trip: 14.0 minutes from pushback to wheels-up at SAT and 7.5 minutes from touchdown to gate at SLC.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
This route has stayed remarkably steady year over year, a smaller swing than 95% of 5,368 comparable routes.
86.7% on time over the most recent 12 months (2025-08 to 2026-07), against 86.4% in the 12 months before (2024-08 to 2025-07), virtually unchanged.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 5,368 in the comparison.
What sets this route apart
Where SAT to SLC differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
SAT to SLC is at its best against routes of similar length for flights scheduled at 5 PM: 86.3% arrive on time, 18.7 points ahead of the 67.6% those routes manage at that hour. Against all other routes the gap is 16.5 points.
SAT to SLC holds up on Sundays better than routes of similar length do: 84.4% on time to their 73.0%, a 11.4 points lead. Against all other routes the gap is 9.6 points.
March is kinder to SAT to SLC than to routes of similar length: 89.4% on time against 75.1%, 14.3 points better. Against all other routes the gap is 11.5 points.
Delta Air Lines does better on SAT to SLC than on its routes of similar length: 86.0% on time here, 80.4% there, 5.6 points apart. Against all other routes the gap is 4.5 points.
SAT to SLC against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 5 PM departures | 86.3% | routes of similar length | 67.6% | +18.7 pts | 131 here, 176,797 there |
| Weekday: Sunday | 84.4% | routes of similar length | 73.0% | +11.4 pts | 450 here, 425,993 there |
| Month: March | 89.4% | routes of similar length | 75.1% | +14.3 pts | 264 here, 256,467 there |
| Airline: Delta Air Lines | 86.0% | routes of similar length | 80.4% | +5.6 pts | 3,116 here, 477,806 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 1,087 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
When it goes wrong
July 2023 – July 2026
26 min late
against a median of 11 min early
Percentiles over 3,144 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at SLC after arriving from SAT.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 25% | High risk |
| 45 min | 14% | Some risk |
| 60 min | 9.2% | Some risk |
| 90 min | 5.2% | Some risk |
| 120 min | 3.8% | Low risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 0.67% of the time and diverts 0.19% of the time, which a late arrival never shows up in.
Chance of missing is the share of 3,117 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 26 minutes late (90th-percentile gate arrival delay), over 3,144 operations.
Any other layover length: connection checker.
Best time to fly
SAT → SLC flights departing 5–9 AM arrived on time 93.9% of the time, against 79.9% for 6–9 PM departures, a gap of 14.0 percentage points.
By departure window
By departure hour
- 12 AM to 5 AM: too few flights to score
- 6 AM: 93.4% on time from 168 flights
- 7 AM: 94.4% on time from 573 flights
- 8 AM: 94.8% on time from 291 flights
- 9 AM to 11 AM: too few flights to score
- 12 PM: 79.5% on time from 543 flights
- 1 PM: too few flights to score
- 2 PM: 85.6% on time from 438 flights
- 3 PM to 4 PM: too few flights to score
- 5 PM: 86.3% on time from 132 flights
- 6 PM: 79.8% on time from 755 flights
- 7 PM to 11 PM: too few flights to score
Why SAT → SLC runs late
July 2023 – July 2026
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for SAT → SLC. Only delays of 15 minutes or more are attributed. What the five causes mean
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| Delta Air Lines | 3,143 | 86.0% | 0.67% | -11 min | 5.3% |
Weekly and seasonal patterns
By day of week
Wednesday is historically the most reliable day and Monday the least, a gap of 5.2 percentage points.
By month
- Jan: 87.7%
- Feb: 88.3%
- Mar: 89.4%
- Apr: 86.3%
- May: 84.3%
- Jun: 81.5%
- Jul: 80.3%
- Aug: 86.6%
- Sep: 85.6%
- Oct: 90.5%
- Nov: 88.6%
- Dec: 85.6%
July is historically the weakest month and October the strongest, a spread of 10.2 percentage points.
Reliability over time
July 2023 – July 2026
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 86.7% against 86.4% in the 12 months before — broadly unchanged.
Data and methodology
Calculated by FlyerIntel from 3,144 SAT → SLC flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed