Showing Delta only (incl. its regional partners)All airlines ×

1,083 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 96% depart on time. After 4 pm it’s 3 in 4.

Best time to leave 6–7 am 89% arrive on time from BOS

Best single flight DL 859 BOS 06:05 → SLC 09:18 · 89% on time Avoid DL 445 BOS 18:45 → SLC 22:11 · 72% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

BOS

% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Pick an hour to see this route’s flights leaving then.

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.


DL 859	BOS 06:05	SLC 09:18	89%
DL 464	BOS 11:15	SLC 14:24	78%
DL 445	BOS 18:45	SLC 22:11	72%

All 3 Delta flights in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.


DL 859	BOS 06:05	SLC 09:18	5h 13m	365	89%	1.6%	45 min
DL 464	BOS 11:15	SLC 14:24	5h 09m	353	78%	0.8%	99 min
DL 445	BOS 18:45	SLC 22:11	5h 26m	344	72%	1.2%	56 min

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.


Delta	BOS	SLC	5h 13m	79%	1.2%	1,083	Flying now

Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON