The 69-year-old leader landed here by a chartered flight close to midnight after she had to abandon the 8-km roadshow midway due to illness.
Senior party leader Ghulam Nabi Azad said her condition was "stable" after she suffered a bout of "dehydration, vomited and had fever" in Varanasi.
She received medical attention in Varanasi and doctors who attended to her in the holy city accompanied her on the flight back to Delhi.
"She was unwell for the couple of days before but since the programme was there, she was very keen to go," Priyanka said.
After landing, Sonia was taken to the RR Hospital, which is close to the airport. Doctors at the Gangaram Hospital were also kept on standby.
Prime Minister Narendra Modi spoke to Congress's chief ministerial candidate for Uttar Pradesh Sheila Dikshit, who accompanied Gandhi on the road show and inquired about her health.
Congress sources said Sonia was running fever but decided to go ahead with the roadshow in Varanasi, where her condition worsened, as she was not inclined to cancel it at the last moment.
In a statement, the Congress chief regretted that she could not complete her visit to Varanasi due to illness but said she would come back soon for "darshan" of Kashi Vishwanath in the temple town.
"Due to illness, I could not complete my visit for which I regret. I could not seek the blessings of Kashi Vishwanth in the holy month of Savan. I will come back soon. I am thankful to all citizens of Varanasi and Congress workers for the love and affection," she said.
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