UA577 St LouisSTL · 07:30 BostonBOS · 11:00
UA577 by United Airlines flies from St Louis (STL) to Boston (BOS) for the Mon, Oct 12 departure.
Same number through STL → EWR → BOS
arrived at BOS · 7 min early
Where the minutes go
last 7 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operation0 cancelled · 14 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at STL and BOS are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. 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 St Louis to Boston flights today
same route · United AirlinesIf UA577 is cancelled, these are the other United Airlines nonstop flights from St Louis to Boston on the same day, with scheduled departure times in STL local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA577 actually runs
Pro Flight Search has tracked every published board update for UA577 across the STL and BOS boards: schedule changes, gate pushes and actual clocks. Usually lands ~21 min early. Based on 14 confirmed landings · 14/14 within 15 min of schedule. Pushes back late but makes up time in the air.
The verdict above is that record speaking, so it reflects how UA577 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: N816UA, N440UA, N884UA, N837UA.
Board clocks recorded as STL and BOS published them.
Planning around UA577? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search — UA577 St Louis to Boston on-time performance, measured from the STL and BOS airport boards.
https://proflightsearch.com/flight/UA577
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