Salt Lake City (SLC) to Boston (BOS): On-Time Performance
Data through May 2026
Salt Lake City (SLC) to Boston (BOS) effectively runs on two schedules. In May 2026, 92% of arrivals were on time; in August 2024 that fell to 65% — a 28-point seasonal swing. Across the full period the route averages 80% on-time against a national 78%.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 1.2%
- Flights/day
- 3.4
- last 12 months
- Duration
- 4h 38m
- scheduled
- Distance
- 2,105 mi
Best airline from SLC to BOS
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 82% | 12 min | 1.0% | 2,104 |
| JetBlue Airways | 69% | 29 min | 2.3% | 428 |
Monthly on-time trend
Best time to fly from SLC to BOS
Aim for departures around 11 p.m. (87% on-time); avoid 10 p.m. departures (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 19 min |
| Tuesday | 83% | 13 min |
| Wednesday | 84% | 10 min |
| Thursday | 77% | 16 min |
| Friday | 76% | 17 min |
| Saturdaybest | 86% | 10 min |
| Sunday | 77% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations37%
- National airspace system22%
- Weather1%
Frequently asked questions
- How often are flights from SLC to BOS delayed?
- 20% of SLC–BOS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from SLC to BOS?
- Delta Air Lines has the best on-time record on this route at 82%, based on 2,104 flights. 2 airlines flew SLC–BOS frequently enough to compare in this period.
- What is the best time of day to fly from SLC to BOS?
- Departures around 11 p.m. have the best record (87% on-time), while departures around 10 p.m. have the worst (62%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SLC to BOS?
- The scheduled SLC–BOS flight time averages 4h 38m over 2,105 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are SLC to BOS flights cancelled?
- 1.2% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from SLC to BOS?
- August 2024 was the roughest month in this dataset, with only 65% of arrivals on time. The best was May 2026 at 92%. If your dates are flexible, that 28-point gap is worth planning around.
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Based on 2,532 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.