Flynn had resigned from his White House position after misleading Vice President Mike Pence about his discussions with a Russian ambassador.
Cummings questioned whether Flynn violated a provision of the Constitution that would bar him - as a retired military officer - from accepting a payment or "emolument" from a foreign government.
Maryland Democrat Elijah Cummings wrote Trump, Defense Secretary James Mattis and FBI Director James Comey about the new information Thursday. Volga Dnepr Airlines and the cybersecurity firm Kaspersky Government Security Solutions Inc. each paid Flynn $11,250 after commission.
The oversight committee had previously called on the Defense Department to investigate whether Flynn had run afoul of the US Constitution by being paid to speak at the RT gala.
Flynn and his son also received an unspecified amount in expenses paid by RT for business-class flights to and from Moscow and for their three-day stay at the Hotel Metropol.
In a letter he addressed to Trump, Defense Secretary Jim Mattis and FBI Director James Comey, Cummings asked whether Flynn fully disclosed his links to Russian Federation and Turkey before he received a national security clearance and was named to the White House post. Late previous year, a senior Kaspersky Lab technician and Russian ex-cyber cop was arrested in Moscow for treason; us intelligence sources have suggested to reporters that the arrest, and the firm, are connected to USA election hacking they believe was done by Russia.
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The White House has asked those committees to also investigate Mr Trump's unverified wiretapping allegations against Mr Obama. He added in a subsequent tweet: "How low has President Obama gone to tapp my phones during the very sacred election process".
In the 24 pages of assorted 2015 emails and documents voluntarily handed over to the House Oversight Committee by Leading Authorities, RT did not mention that the December 10, 2015 conference and dinner in Moscow celebrating the Russian network's 10th anniversary would be broadcast on television worldwide or that the star speaker - within arm's reach of Flynn in a video of the televised event - would be Russian President Vladimir Putin. Both companies are privately owned and based in Russian Federation, though Flynn appears to have given talks to branches based in the US, according to Yahoo News.
Last week, Flynn filed lobbying disclosure forms revealing that he was paid more than $500,000 previous year to lobby on behalf of the Turkish government in its effort to discredit the exiled cleric Fethullah Gülen. Another attendee who took part in some of the tours told The Associated Press they did not see Flynn at those events.
But a letter Cummings wrote Pence Nov. 18, the day after Trump said he meant to name Flynn national security adviser, raised Flynn's Turkey work, casting doubt on those versions. They include how Flynn answered questions about his contact with foreign nationals, his work for foreign governments and businesses, and any worldwide real estate holdings.
Word of Flynn's paid work on behalf of Russian entities adds to the mystery swirling around reports of Trump campaign officials' links to the Kremlin.
The registration involved $530,000 worth of lobbying that Flynn's firm performed for a company owned by a Turkish businessman.
According to reports, he first met Trump in mid-2015 and later became an advisor to his campaign. After Flynn was appointed, his attorneys then notified the White House counsel's office that a filing was imminent.