Schedule: a typical Friday (the flights of Jul 31, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
REPUBLIC · FLIGHT YX 4678
SCHEDULED · TYPICAL SCHEDULE
YX 4678 · BOS → STL
departs 5:12 PM ET · arrives 7:21 PM CT
Forecast issued Wed 6:00 PM ET · 47h before departure
Odds over time
Arrive at STL more than 15 minutes late?
65%
chance · ±10 pts
+24 pts · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
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How late will it get to STL?
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On time or early
34%
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15–30 min late
6%
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30 min–1 hour late
35%
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1–2 hours late
15%
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Over 2 hours late
7%
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Cancelled
2%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.