Route profile
MIA→SLC
Flight reliability, delays and best times to fly from Miami to Salt Lake City, 2,088 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 35% of comparable major US routes (4,598 compared)
Calculated from 2,045 flights. How this is calculated
MIA → SLC arrives on time 74.1% of the time; the return trip, SLC → MIA, arrives on time 81.2% of the time, a 7.1-point gap between the two directions of the same city pair.
MIA → SLC spends 31.2 minutes on the ground on a 2,088-mile trip: 23.5 minutes from pushback to wheels-up at MIA and 7.7 minutes from touchdown to gate at SLC.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
Which day you fly matters unusually much here, a wider weekday spread than 98% of 4,467 comparable routes.
83.7% on time on a typical Tuesday, against 66.3% on a Sunday.
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 4,467 in the comparison.
What sets this route apart
Where MIA to SLC differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
MIA to SLC struggles most at 6 AM: 80.9% of its flights scheduled then arrive on time, 8.8 points behind the 89.7% on routes of similar length at the same hour. Against all other routes the gap is 9.9 points.
Saturday is the day MIA to SLC slips furthest against routes of similar length, 68.9% on time where they average 79.3%, 10.4 points lower. Against all other routes the gap is 10.2 points.
In July, MIA to SLC runs 11.4 points below routes of similar length, 59.2% on time to 70.6%. Against all other routes the gap is 10.5 points.
Delta Air Lines’ flights on MIA to SLC arrive on time 73.0% of the time, 8.9 points below the 81.9% it manages on its routes of similar length. Against all other routes the gap is 8.5 points.
MIA to SLC against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 6 AM departures | 80.9% | routes of similar length | 89.7% | −8.8 pts | 152 here, 59,446 there |
| Weekday: Saturday | 68.9% | routes of similar length | 79.3% | −10.4 pts | 293 here, 135,012 there |
| Month: July | 59.2% | routes of similar length | 70.6% | −11.4 pts | 201 here, 116,638 there |
| Airline: Delta Air Lines | 73.0% | routes of similar length | 81.9% | −8.9 pts | 1,118 here, 251,949 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 2,088 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
53 min late
against a median of 3 min early
Percentiles over 2,045 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at SLC after arriving from MIA.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 42% | Likely to miss |
| 45 min | 25% | High risk |
| 60 min | 17% | High risk |
| 90 min | 8.7% | Some risk |
| 120 min | 5.3% | Some 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 0.59% of the time and diverts 0.24% of the time, which a late arrival never shows up in.
Chance of missing is the share of 2,028 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 53 minutes late (90th-percentile gate arrival delay), over 2,045 operations.
Any other layover length: connection checker.
Best time to fly
MIA → SLC flights departing 5–9 AM arrived on time 85.9% of the time, against 69.2% for 6–9 PM departures, a gap of 16.7 percentage points.
By departure window
By departure hour
- 12 AM to 5 AM: too few flights to score
- 6 AM: 80.9% on time from 154 flights
- 7 AM: 91.8% on time from 134 flights
- 8 AM: 85.6% on time from 148 flights
- 9 AM: 82.3% on time from 204 flights
- 10 AM to 5 PM: too few flights to score
- 6 PM: 67.7% on time from 694 flights
- 7 PM: 72.4% on time from 445 flights
- 8 PM: 66.2% on time from 153 flights
- 9 PM to 11 PM: too few flights to score
Departure windows with fewer than 120 flights are not scored.
Why MIA → 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
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for MIA → SLC. Only delays of 15 minutes or more are attributed.
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 | 1,126 | 73.0% | 0.44% | -1 min | 9.2% |
| American Airlines | 919 | 75.4% | 0.76% | -6 min | 8.4% |
Delta Air Lines flew 55.1% of the 2,045 flights listed.
American Airlines arrived on time 2.4 percentage points more often than Delta Air Lines on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| DL2021 Delta Air Lines | 6:40 PM | 784 | 73.8% |
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Sunday the least, a gap of 17.4 percentage points.
By month
- Jan: 76.7%
- Feb: 79.0%
- Mar: 75.9%
- Apr: 78.4%
- May: 73.9%
- Jun: 76.0%
- Jul: 59.2%
- Aug to Oct: no data
- Nov: 77.2%
- Dec: 75.1%
July is historically the weakest month and February the strongest, a spread of 19.8 percentage points.
Reliability over time
July 2023 – July 2026
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 76.7% against 73.9% in the 12 months before — improving by 2.8 percentage points.
Data and methodology
Calculated by FlyerIntel from 2,045 MIA → 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