We're seeing some excellent fares for summer travel to Budapest via Air Canada/United from a handful of US cities. Travel dates may vary slightly by route, ranging from May 11 through September 16. Peak summer dates are a tad higher ($474) than early spring dates, naturally. Seen below, we found seats over the July 4th holiday, departing DTW on Tuesday, July 3, returning from BUD on Thursday, July 12.
These aren't likely to last for long so book quickly!