UA1948 CancúnCUN · 12:57 San FranciscoSFO · 16:40
UA1948 by United Airlines flies from Cancún (CUN) to San Francisco (SFO) for the Mon, Sep 21 departure.
arrived at SFO · 21 min early
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Early read, sample still buildingConditions at CUN and SFO 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. This route's tracked sample is still thin — treat these as an early read, not a precise forecast.
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 Cancún to San Francisco flights today
same route · United AirlinesIf UA1948 is cancelled, this is the other United Airlines nonstop flight from Cancún to San Francisco on the same day, with scheduled departure times in CUN local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA1948 actually runs
Pro Flight Search has tracked every published board update for UA1948 across the CUN and SFO boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 1 completed leg so far: landed +14 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how UA1948 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationBoard clocks recorded as CUN and SFO published them.
Planning around UA1948? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA1948 Cancún to San Francisco on-time performance, measured from the CUN and SFO airport boards.
https://proflightsearch.com/flight/UA1948
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