The 28-year-old arrived on board a Lufthansa flight from Germany, accompanied by a colleague from her employer, the Boston-based Christian Science Monitor.
She was released by her Iraqi captors on Thursday after she was abducted on January 7 in Baghdad by armed men who shot her Iraqi translator dead.
Ms Carroll declined to comment to reporters on the same flight, and was immediately taken to the paper's headquarters upon arrival.
"She's meeting with her family out of the glare of the media spotlight," said Monitor spokesman Jay Jostyn.
Earlier, during a flight change in Germany, Ms Carroll released a statement disavowing statements she made before and immediately after her release, now saying she had been repeatedly threatened during her captivity.
She said a video recorded before she was freed and posted by her captors on an Islamic website, in which she spoke out against the US military presence, was made under duress.
"During my last night in captivity, my captors forced me to participate in a propaganda video. They told me I would be released if I cooperated. I was living in a threatening environment, under their control, and I wanted to go home alive. So I agreed," she said in the statement.
"Things that I was forced to say while captive are now being taken by some as an accurate reflection of my personal views. They are not. The people who kidnapped me and murdered (translator) Allan Enwiya are criminals, at best," said the statement on the Christian Science Monitor website.
"Let me be clear: I abhor all who kidnap and murder civilians, and my captors are clearly guilty of both crimes. I was, and remain, deeply angry with the people who did this."
Ms Carroll, who has studied Arabic, attracted much sympathy during her ordeal from home as well as a wide variety of groups in the Middle East, including the Islamic militant group Hamas, which appealed for her release.
Praise for insurgents
Prominent US senator John McCain, who was tortured during captivity in the Vietnam war, told NBC television on Sunday that Ms Carroll was probably under duress when she was shown in the "propaganda" video.
"We understand when you're held captive in that kind of situation that you do things under duress. And God bless her and we're glad she's home," Senator McCain said.
However, Ms Carroll's sudden release is still shrouded in mystery.
"Neither we nor Jill's family, our government, nor anyone we know of negotiated on her behalf, paid anything on her behalf. We simply do not know the facts that surround why she happened to be released at that time," the editor of the Christian Science Monitor, Richard Bergenheim, has said.
Soon after her release in Iraq, video footage showed Ms Carroll praising Iraq's insurgents.
"I think the mujahedeen are very smart and even with all the technology and all the people that the American army has here, they still are better at knowing how to live and work here, more clever," she said at the time, in response to a question.
Asked what she meant, she said: "It makes very clear that the mujahedeen are the ones that will win in the end."