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Delta Airlines via ShermansTravel offers United Airlines Roundtrip Flights to Hawaii from select cities in the U.S. with prices starting from $361.59. (On the Shermans Travel landing page, click on "Delta.com" in the main paragraph to see this sale; we found this price on September 21 with return on September 26.) That's the lowest price we could find for select routes by at least $110. Book this travel deal by August 31.

All prices, dates, and booking details were valid at the time of publication.