Southwest has round-trip flights from Dallas (DAL) to Honolulu, Maui, Kona, or Lihue, Hawaii (HNL, OGG, KOA, LIH) for $284-$314, with a connection. About $140-$157 each-way. Flights August to November. Origin/Destination reversible.
Note: Honolulu is more expensive than the other destinations. Maui, is $284.
Carry-on and checked bag are allowed for free. Southwest doesn’t charge change fees.
Additional Savings: Sam’s Club is selling $500 Southwest gift cards for $449 [linked]. You can save an additional $50 on Southwest flights if you travel often enough or with a big enough group to burn through the gift card credit.