Schedule: the flights that flew on Thursday, Oct 22, 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
Thursday, October 29 Yesterday
DL 1239 · SEA → SLC
departs 7:50 PM PT · arrives 10:55 PM MT
Forecast issued Thu 11:00 PM ET · 0h before departure
Watch this flight
Other days
Thu 10/29
Sun 11/1 38%
Mon 11/2 25%
Odds over time
Arrive at SLC more than 15 minutes late?
27%
chance · ±1 pts
+5 pts · 24h
HOW SURE WE ARE
Very high. The odds now come almost entirely from live conditions.
Arrive 15+ late
27%
Leave 15+ late
25%
Arrive 1h+ late
5%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
7.0d
2d
1d
12h
6h
Departs
Lands
Arrive at SLC more than 15 minutes late?
Calm-weather odds: 26% · changed +5 pts in 24h
+5 pts
27%
Yes 27%
No 73%
Leave SEA more than 15 minutes late?
Calm-weather odds: 25% · changed +3 pts in 24h
+3 pts
25%
Yes 25%
No 75%
Arrive at SLC more than an hour late?
Calm-weather odds: 5% · changed +0 pts in 24h
+0 pts
5%
Yes 5%
No 95%
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
72%
15–30 min late
13%
30 min–1 hour late
9%
1–2 hours late
3%
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
↑
7pm departures from SEA are often late
↑
Later flights pick up delays from earlier in the day
↑
SEA is busy at that time
↓
Mostly benign weather forecast at SLC
↓
This flight has been late 19% of the time recently
Weather at each end
SEA (origin)
Gusts 9 kt Ceiling 3,100 ft Visibility 6 mi Precip 0.12 in
SLC (destination)
Gusts 7 kt Ceiling 9,000 ft Visibility 4 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.