Schedule: the flights that flew on Sunday, Oct 25, 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
Sunday, November 1 Tomorrow
DL 1239 · SEA → SLC
departs 7:50 PM PT · arrives 10:55 PM MT
Forecast issued Sat 1:00 AM ET · 47h before departure
Watch this flight
Other days
Sun 11/1
Mon 11/2 25%
Odds over time
Arrive at SLC more than 15 minutes late?
38%
chance · ±3 pts
+2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
38%
Leave 15+ late
32%
Arrive 1h+ late
8%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
7.0d
Now
1d
12h
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 28% · changed +2 pts in 24h
+2 pts
38%
Yes 38%
No 62%
Leave SEA more than 15 minutes late?
Calm-weather odds: 27% · changed −3 pts in 24h
−3 pts
32%
Yes 32%
No 68%
Arrive at SLC more than an hour late?
Calm-weather odds: 6% · changed −1 pt in 24h
−1 pt
8%
Yes 8%
No 92%
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
61%
15–30 min late
18%
30 min–1 hour late
12%
1–2 hours late
4%
Over 2 hours late
3%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Cloud base down to 800 ft, visibility down to 0.7 mi, 1.0 in of rain forecast at SLC that day
↑
Later flights pick up delays from earlier in the day
↑
Arrivals into SLC at that hour are often late
↓
Cloud base down to 300 ft, visibility down to 0.3 mi forecast at SEA that day
↓
SLC usually runs smoothly
Weather at each end
SEA (origin)
Gusts 4 kt Ceiling 1,800 ft Visibility 0.3 mi Precip none
SLC (destination)
Gusts 22 kt Ceiling 800 ft Visibility 0.7 mi Precip 1.04 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.