Schedule: the flights that flew on Friday, Oct 23, 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
Friday, October 30
DL 1239 · SEA → SLC
departs 7:50 PM PT · arrives 10:55 PM MT
Forecast issued Fri 11:00 PM ET · 0h before departure
Watch this flight
Odds over time
Arrive at SLC more than 15 minutes late?
35%
chance · ±0 pts
+10 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
35%
Leave 15+ late
32%
Arrive 1h+ late
7%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
7.0d
2d
1d
12h
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 34% · changed +10 pts in 24h
+10 pts
35%
Yes 35%
No 65%
Leave SEA more than 15 minutes late?
Calm-weather odds: 32% · changed +8 pts in 24h
+8 pts
32%
Yes 32%
No 68%
Arrive at SLC more than an hour late?
Calm-weather odds: 8% · changed +2 pts in 24h
+2 pts
7%
Yes 7%
No 93%
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
64%
15–30 min late
15%
30 min–1 hour late
13%
1–2 hours late
5%
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
↑
0.4 in of rain forecast at SLC that day
↑
Later flights pick up delays from earlier in the day
↑
7pm departures from SEA are often late
↓
This flight has been late 19% of the time recently
↓
SLC usually runs smoothly
Weather at each end
SEA (origin)
Gusts 9 kt Ceiling 1,000 ft Visibility 4 mi Precip 0.41 in
SLC (destination)
Gusts 18 kt Ceiling 4,900 ft Visibility 5 mi Precip 0.22 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.