Schedule: the flights that flew on Monday, Oct 5, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
DELTA · FLIGHT DL 1239
SCHEDULED · TYPICAL SCHEDULE
Monday, October 12 Tomorrow
DL 1239 · SEA → SLC
departs 7:50 PM PT · arrives 10:55 PM MT
Forecast issued Sun 7:00 PM ET · 28h before departure
Watch this flight
Other days
Today 50%
Mon 10/12
Thu 10/15 26%
Fri 10/16 28%
Odds over time
Arrive at SLC more than 15 minutes late?
25%
chance · ±1 pts
+2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
25%
Leave 15+ late
26%
Arrive 1h+ late
6%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
7.0d
2d
Now
12h
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 22% · changed +2 pts in 24h
+2 pts
25%
Yes 25%
No 75%
Leave SEA more than 15 minutes late?
Calm-weather odds: 20% · changed +2 pts in 24h
+2 pts
26%
Yes 26%
No 74%
Arrive at SLC more than an hour late?
Calm-weather odds: 4% · changed +0 pts in 24h
+0 pts
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to SLC?
On time or early
75%
15–30 min late
7%
30 min–1 hour late
11%
1–2 hours late
4%
Over 2 hours late
2%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
0.6 in of rain forecast at SLC that day
↑
Arrivals into SLC at that hour are often late
↑
7pm departures from SEA are often late
↓
Mostly benign weather forecast at SEA
↓
Mondays in October are usually quieter than average
Weather at each end
SEA (origin)
Gusts 4 kt Ceiling none (clear) Visibility 10+ mi Precip none
SLC (destination)
Gusts 24 kt Ceiling 2,100 ft Visibility 6 mi Precip 0.56 in
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.