Schedule: a typical Saturday (the flights of Jul 25, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
REPUBLIC · FLIGHT YX 4678
SCHEDULED · TYPICAL SCHEDULE
Saturday, October 3
YX 4678 · BOS → STL
departs 1:10 PM ET · arrives 3:20 PM CT
Forecast issued Wed 5:00 PM ET · 68h before departure
Watch this flight
Other days
Today 33%
Thu 10/1 35%
Fri 10/2 65%
Sat 10/3
Sun 10/4 30%
Mon 10/5 28%
Tue 10/6 22%
Odds over time
Arrive at STL more than 15 minutes late?
10%
chance · ±1 pts
−3 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
10%
Leave 15+ late
11%
Arrive 1h+ late
3%
Cancelled
<1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
5%
10%
15%
20%
4.6d
Now
2d
1d
12h
6h
Departs
Lands
Arrive at STL more than 15 minutes late?
Calm-weather odds: 10% · changed −3 pts in 24h
−3 pts
10%
Yes 10%
No 90%
Leave BOS more than 15 minutes late?
Calm-weather odds: 9% · changed −1 pt in 24h
−1 pt
11%
Yes 11%
No 89%
Arrive at STL more than an hour late?
Calm-weather odds: 2% · changed +0 pts in 24h
+0 pts
3%
Yes 3%
No 97%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
<1%
Yes <1%
No 99%
How late will it get to STL?
On time or early
89%
15–30 min late
2%
30 min–1 hour late
6%
1–2 hours late
2%
Over 2 hours late
1%
Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
This flight has been late 37% of the time recently
↑
Arrivals into STL at that hour are often late
↓
Mostly benign weather forecast at BOS
↓
YX's recent on-time record
Weather at each end
BOS (origin)
Gusts 14 kt Ceiling none (clear) Visibility 10+ mi Precip none
STL (destination)
Gusts 10 kt Ceiling none (clear) Visibility 10+ 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.