Best Time to Fly BOS to SLC: On-Time Stats by Hour & Airline
Logan International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 75.5% of Boston (BOS) to Salt Lake City (SLC) flights arrived on time (1,256 scheduled flights). That is 2.2 points below the national average of 77.6%.
Among 2 airlines, Delta Air Lines led with 78.7% on time and JetBlue was last with 54.3%.
Over 24 months, Wednesday was the most reliable day (82% on time) and December the worst month (69%).
The cancellation rate was 1.8% (US average 1.8%).
BOS to SLC on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 78.7% | 68 min | 1.2% | 1,083 |
| JetBlue | 54.3% | 55 min | 5.2% | 173 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BOS to SLC
On-time arrival % by scheduled departure hour (local time), 2,526 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 88.6% | 1.0% | 712 |
| 7am–8am | Limited data | 1 | |
| 8am–9am | 67.4% | 4.2% | 48 |
| 9am–10am | 87.9% | 0.0% | 117 |
| 10am–11am | 79.0% | 0.7% | 406 |
| 11am–12pm | 79.8% | 0.7% | 135 |
| 12pm–1pm | Limited data | 10 | |
| 1pm–2pm | Limited data | 8 | |
| 3pm–4pm | Limited data | 3 | |
| 4pm–5pm | 80.0% | 0.0% | 90 |
| 5pm–6pm | 73.4% | 2.1% | 142 |
| 6pm–7pm | 69.8% | 0.9% | 695 |
| 7pm–8pm | 65.4% | 3.1% | 159 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BOS to SLC
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 89.8% | +9.9 pts | 0.0% | 49 |
| Christmas & New Year (Dec 20 - Jan 3) | 61.6% | -18.3 pts | 1.8% | 114 |
| Summer peak (Jun 15 - Aug 15) | 74.1% | -5.8 pts | 1.4% | 490 |
| All other days | 79.9% | — | 1.0% | 1,873 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).