73% of SLC → SEA flights arrived on time in June-August 2026 (1,104 flights). The most reliable was DL 2874, on time 92% of the time on this route. Morning flights did best (80%), evening flights worst (64%). Salt Lake City (SLC): no delay reported. Seattle (SEA): no delay reported.
Best time of day to fly SLC → SEA
| Morning (before noon) | |
| Afternoon (noon-5 PM) | |
| Evening (after 5 PM) |
Flights SLC → SEA, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| DL 2874 Delta | 7:50 AM | 0% | |
| AS 1444 Alaska Airlines | 6:23 AM | 0% | |
| DL 2995 Delta | 11:35 AM | 1.1% | |
| DL 2998 Delta | 10:45 PM | 0% | |
| AS 664 Alaska Airlines | 12:51 PM | 0% | |
| DL 2817 Delta | 3:14 PM | 0% | |
| DL 2921 Delta | 1:20 PM | 0% | |
| AS 796 Alaska Airlines | 11:17 AM | 1.1% | |
| DL 871 Delta | 5:20 PM | 0% | |
| AS 719 Alaska Airlines | 8:46 PM | 0% | |
| OO 3381 SkyWest | 9:10 AM | 0% | |
| AS 665 Alaska Airlines | 6:44 PM | 0% | |
| AS 734 Alaska Airlines | 4:00 PM | 0% | |
| DL 2016 Delta | 8:44 PM | 0% |
SLC conditions · SEA conditions · SEA → SLC · 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.