Here's another flash sale to Hawaii on United. Fly from Delta's major hub cities to Honolulu for just $417 roundtrip.
Travel from August 19 through December 18, 2019, on Mondays, Tuesdays, Wednesdays, and Thursdays.
Peak Thanksgiving holiday travel is blacked out.
This sale is unadvertised and fares may jump at any moment.
Fares also work in the reverse direction.
United's Basic Economy fares only include a small personal item and do not allow a full-size carry-on bag. A checked bag is $30 each way on all fares.
Seats will be assigned at random upon check-in or you may be able to pay a fee to choose a specific seat.
Basic Economy fares can be upgraded to a standard Economy for an extra $90 roundtrip. which includes a full-size carry-on bag, standard advanced seat selection, and allows ticket changes/upgrades for a fee. The first checked bag fee is the same $30 each way.
As an example, I found seats departing Atlanta ATL on Thursday, August 22, returning from Honolulu HNL on Thursday, August 29, for $417 roundtrip.