Boston (BOS) to Salt Lake City (SLC): On-Time Performance
Data through July 2026
Boston (BOS) to Salt Lake City (SLC) effectively runs on two schedules. In October 2024, 90% of arrivals were on time; in December 2025 that fell to 66% — a 24-point seasonal swing. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (84% vs 69%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 1.2%
- Flights/day
- 3.4
- last 12 months
- Duration
- 5h 28m
- scheduled
- Distance
- 2,105 mi
Best airline from BOS to SLC
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 81% | 15 min | 1.0% | 2,199 |
| JetBlue Airways | 62% | 26 min | 2.4% | 449 |
Monthly on-time trend
Best time to fly from BOS to SLC
Aim for departures around 6 a.m. (89% on-time); avoid 7 p.m. departures (65%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 17 min |
| Tuesday | 79% | 19 min |
| Wednesdaybest | 81% | 11 min |
| Thursday | 78% | 18 min |
| Friday | 79% | 18 min |
| Saturday | 75% | 17 min |
| Sunday | 73% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft25%
- Airline operations49%
- National airspace system24%
- Weather2%
Frequently asked questions
- How often are flights from BOS to SLC delayed?
- 22% of BOS–SLC flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 17 minutes.
- Which airline is most reliable from BOS to SLC?
- Delta Air Lines has the best on-time record on this route at 81%, based on 2,199 flights. 2 airlines flew BOS–SLC frequently enough to compare in this period.
- What is the best time of day to fly from BOS to SLC?
- Departures around 6 a.m. have the best record (89% on-time), while departures around 7 p.m. have the worst (65%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOS to SLC?
- The scheduled BOS–SLC flight time averages 5h 28m over 2,105 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are BOS to SLC flights cancelled?
- 1.2% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from BOS to SLC?
- December 2025 was the roughest month in this dataset, with only 66% of arrivals on time. The best was October 2024 at 90%. If your dates are flexible, that 24-point gap is worth planning around.
Explore related pages
More routes from BOS
Other ways to fly to Salt Lake City (SLC)
Related guides
Based on 2,648 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.