The near miss occurred late on October 17, when a Russian jet that was escorting a larger spy plane manoeuvred in the vicinity of an American warplane, Air Force Lieutenant General Jeff Harrigian said.
The Russian jet came to "inside of half a mile", he added.
Another US military official, speaking on condition of anonymity , said the American pilot could feel the turbulence produced by the Russian jet's engines.
It appeared the Russian pilot had simply not seen the US jet, as it was dark and the planes were flying without lights.
"I would attribute it to not having the necessary situational awareness given all those platforms operating together," Harrigian said.
The incident raises serious questions about the extent to which pilots are able to track the complex airspace they operate in.
The US-led coalition has set up a hotline with Russian counterparts so the different militaries can discuss the approximate locations and missions of planes, and avoid operating in the same space at the same time.
The next day, US officers used the hotline to ask Russia what had happened and they said "the pilot didn't see" the American plane, the official said.
Harrigian said there had been an increase in close calls over the past six weeks, with intentional near misses - when a Russian jet deliberately follows a coalition plane too closely - "happening one every 10 days-ish".
Russia is flying constant air patrols over Syria, the vast majority of them over the devastated city of Aleppo, and routinely transits parts of the country the US-coalition operates in, officials said.
The Pentagon periodically chides Russia for "unsafe and unprofessional behaviour" in air operations.
This incident was deemed unsafe, but not necessarily unprofessional, officials said.
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