Today looks like a normal day here: all 3 nonstops are 7–12% likely to arrive 15+ min late.

Safest bet today DL 3718 SLC 09:25 → TUS 10:24 · 7% chance 15+ min late · usually 97% on time Riskiest DL 4054 SLC 20:30 → TUS 21:29 · 12% chance 15+ min late · usually 86% on time

Against a calm day 9% average chance a nonstop arrives 15+ min late; 8% for the same flights on a calm-weather day

Every nonstop today

12-month record →

Ranked by the chance of arriving 15+ minutes late, with each flight’s on-time record over Aug 2025 – Jul 2026 beside it. Times are local. Pick a flight for its forecast. Click a column to sort.


DL 3718 Delta flown by SkyWest Flight history →	SLC 09:25	TUS 10:24	7%	4%	0.2%	97%
DL 3717 Delta flown by SkyWest Flight history →	SLC 15:00	TUS 16:06	9%	3%	0.6%	94%
DL 4054 Delta flown by SkyWest Flight history →	SLC 20:30	TUS 21:29	12%	4%	0.6%	86%

How these are worked out. Each flight’s odds are our forecast for that day; flights of airlines we don’t forecast yet use their 12-month record and are marked. Makes the connection: the first flight’s 12-month lateness curve, scaled so its chance of arriving 15+ min late matches the day’s forecast, at the layover minus the 45-minute minimum (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled × second flight within 15 minutes, each from the day’s forecast.

About this data: forecast odds from our model for Mon, Oct 5 (newest published update); 12-month records from US DOT on-time data, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. JSON