69% of BOS → SLC flights arrived on time in June-August 2026 (357 flights). The most reliable was DL 859, on time 90% of the time on this route. Morning flights did best (81%), evening flights worst (55%). Boston Logan (BOS): no delay reported. Salt Lake City (SLC): no delay reported.
Best time of day to fly BOS → SLC
| Morning (before noon) | |
| Evening (after 5 PM) |
Flights BOS → SLC, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| DL 859 Delta | 6:05 AM | 0% | |
| DL 464 Delta | 11:15 AM | 0% | |
| DL 445 Delta | 6:45 PM | 0% | |
| B6 247 JetBlue | 7:32 PM | 7.3% |
BOS conditions · SLC conditions · SLC → BOS · Cancellations
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From BTS on-time data, June-August 2026; flights with 20+ trips on this route. On-time rates cover each flight number's whole day, which can include other legs. Departure times are local.