The 28-year-old American will go head-to-head with Australian Lani Pallister – who qualified second – and Canadian hopeful Summer McIntosh, fourth, to determine the new world champion.
Fellow Kiwi Olympian Eve Thomas also missed out on a spot in the final, posting the 14th-fastest heat time with 4:10.10.
Fairweather was out for revenge after narrowly missing out on medalling in the 400m freestyle final at the Paris Olympics last year in what was beforehand dubbed the “Race of the Century”.
She finished 0.26 seconds behind Ledecky, with McIntosh taking second place and Australian Ariarne Titmus – who is not competing in the world championships – taking gold.
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“I’m a bit gutted to get fourth, nobody wants to be there,” Fairweather said. “I might be a little bit upset now but I can definitely see the bright side of it already.”
“Being among all those girls is awesome. I’m in one of the most competitive races there is, so I can’t complain.”
Fairweather took out first place in the world championships held before the Olympics in Doha, which none of the three Olympic medallists attended.
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