Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
DELTA · FLIGHT DL 3172
SCHEDULED · TYPICAL SCHEDULE
Wednesday, September 30 Today
DL 3172 · SLC → ONT
departs 11:21 AM MT · arrives 12:10 PM PT
Forecast issued Wed 1:00 PM ET · 0h before departure
Watch this flight
Other days
Today
Thu 10/1 9%
Fri 10/2 8%
Sat 10/3 8%
Sun 10/4 11%
Mon 10/5 8%
Tue 10/6 6%
Odds over time
Arrive at ONT more than 15 minutes late?
10%
chance · ±1 pts
+0 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
10%
Leave 15+ late
8%
Arrive 1h+ late
3%
Cancelled
<1%
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
2.8d
2d
1d
12h
6h
Now
Departs
Lands
Arrive at ONT more than 15 minutes late?
Calm-weather odds: 9% · changed +0 pts in 24h
+0 pts
10%
Yes 10%
No 90%
Leave SLC more than 15 minutes late?
Calm-weather odds: 8% · changed +1 pt in 24h
+1 pt
8%
Yes 8%
No 92%
Arrive at ONT more than an hour late?
Calm-weather odds: 3% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to ONT?
On time or early
89%
15–30 min late
6%
30 min–1 hour late
2%
1–2 hours late
2%
Over 2 hours late
<1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
SLC is busy at that time
↑
DL's recent on-time record
↑
Other factors
↓
Mostly benign weather forecast at SLC
↓
Mostly benign weather forecast at ONT
Weather at each end
SLC (origin)
Gusts 16 kt Ceiling none (clear) Visibility 10+ mi Precip none
ONT (destination)
Gusts 17 kt Ceiling none (clear) Visibility 10+ mi Precip none
How this resolves
Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.
Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.