AA4678 BostonBOS · 17:22 St LouisSTL · 19:30
AA4678 by American Airlines flies from Boston (BOS) to St Louis (STL).
scheduled from BOS
The route today
live boardsWeather lens
Weather-conditioned outlook for this flight right now
Measured, 90-day sampleDriven mainly by BOS (Boston), currently flying MVFR (marginal visual). For this route and airline, under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Boston to St Louis flights today
same route · American AirlinesIf AA4678 is cancelled, these are the other American Airlines nonstop flights from Boston to St Louis on the same day, with scheduled departure times in BOS local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How AA4678 actually runs
Pro Flight Search has tracked every published board update for AA4678 across the BOS and STL boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 2 completed legs so far: landed +18 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how AA4678 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N401YX, N439YX.
Board clocks recorded as BOS and STL published them.
Planning around AA4678? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — AA4678 Boston to St Louis on-time performance, measured from the BOS and STL airport boards.
https://proflightsearch.com/flight/AA4678
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