Best Time to Fly SLC to BOS: On-Time Stats by Hour & Airline
Salt Lake City International → Logan International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 82.1% of Salt Lake City (SLC) to Boston (BOS) flights arrived on time (1,256 scheduled flights). That is 4.5 points above the national average of 77.6%.
Delta Air Lines was the most punctual of the 2 airlines on the route at 83.5%, while JetBlue trailed at 72.8%.
November has been the best month (88% on time) and Thursday the weakest day of the week (77%).
2.0% of flights were cancelled, versus 1.8% nationally.
SLC to BOS 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 | 83.5% | 62 min | 1.3% | 1,083 |
| JetBlue | 72.8% | 72 min | 6.4% | 173 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to BOS
On-time arrival % by scheduled departure hour (local time), 2,523 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 2 | |
| 7am–8am | Limited data | 16 | |
| 8am–9am | Limited data | 4 | |
| 9am–10am | 83.5% | 1.0% | 501 |
| 10am–11am | 80.7% | 0.0% | 228 |
| 11am–12pm | Limited data | 1 | |
| 12pm–1pm | Limited data | 26 | |
| 1pm–2pm | 81.8% | 0.0% | 33 |
| 5pm–6pm | 76.8% | 0.7% | 720 |
| 9pm–10pm | Limited data | 1 | |
| 10pm–11pm | 68.0% | 3.4% | 179 |
| 11pm–12am | 86.6% | 1.5% | 812 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SLC to BOS
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) | 85.7% | +2.9 pts | 0.0% | 49 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.2% | -7.6 pts | 1.7% | 115 |
| Summer peak (Jun 15 - Aug 15) | 74.8% | -8.0 pts | 1.6% | 490 |
| All other days | 82.8% | — | 1.1% | 1,869 |
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).