Schedule: the flights that flew on Wednesday, Oct 21, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.
WESTJET · FLIGHT WS 1503
SCHEDULED · TYPICAL SCHEDULE
Wednesday, October 28 Tomorrow
WS 1503 · SFO → YYC
departs 1:15 PM PT · arrives 4:56 PM MDT
Forecast issued Tue 2:00 AM ET · 38h before departure
Watch this flight
Other days
Today 24%
Wed 10/28
Thu 10/29 15%
Fri 10/30 20%
Sat 10/31 18%
Odds over time
Arrive at YYC more than 15 minutes late?
20%
chance · ±2 pts
−2 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
20%
Leave 15+ late
18%
Arrive 1h+ late
6%
Cancelled
3%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
10%
20%
30%
40%
6.7d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at YYC more than 15 minutes late?
Calm-weather odds: 11% · changed −2 pts in 24h
−2 pts
20%
Yes 20%
No 80%
Leave SFO more than 15 minutes late?
Calm-weather odds: 13% · changed +0 pts in 24h
+0 pts
18%
Yes 18%
No 82%
Arrive at YYC more than an hour late?
Calm-weather odds: 5% · changed −1 pt in 24h
−1 pt
6%
Yes 6%
No 94%
Cancelled?
Calm-weather odds: 2% · changed −2 pts in 24h
−2 pts
3%
Yes 3%
No 97%
How late will it get to YYC?
On time or early
77%
15–30 min late
2%
30 min–1 hour late
12%
1–2 hours late
3%
Over 2 hours late
3%
Cancelled
3%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
Visibility down to 1 mi, 0.7 in of snow forecast at YYC that day
↑
1pm departures from SFO are often late
↑
This route's recent record
↓
Mostly benign weather forecast at SFO
↓
Wednesdays in October are usually quieter than average
Weather at each end
SFO (origin)
Gusts 13 kt Ceiling none (clear) Visibility 10+ mi Precip none
YYC (destination)
Gusts 17 kt Ceiling 1,500 ft Visibility 1 mi Precip 0.04 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.