"I didn't rest too much for this (meet)," the 20-year-old said after notching her 11th national title.
"Compared to other trials and selection meets, this might be the least tapered that I've been over the past couple of years. I'm getting in and racing. I have confidence from training that I can get up and go times like that."
The win for Ledecky, who swam a world record 8:04.79 in the event at last year's Rio Olympics, came shortly after she had finished sixth in the 100 freestyle final.
Mallory Comerford won that race in 52.81 seconds, pushing Olympic champion Simone Manuel into second place and qualifying for her first major international competition.
Nathan Adrian, who won 100m freestyle gold at the London Olympics by a fingertip, claimed his eighth national title in the blue riband sprint in a time of 47.96, beating Caeleb Dressel by a hundredth of a second.
Dressel and Manuel also earned Budapest tickets, as did Zach Apple, Hali Flickinger, Townley Haas, True Sweetser, Jack Conger, Lia Neal and Kelsi Worrell.
The meet resumes on Wednesday with men's and women's 200m freestyle, breaststroke, backstroke and 50m butterfly.
(Reporting by Frank Pingue in Toronto, editing by Nick Mulvenney)
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