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American Airlines have round trip airfares travelling from Denver (DEN) to Kailua Hawaii (KOA) for $ 334, making 1 stop. This is a basic economy fare. The one way fare is $ 165 so if you can’t find a return date to your schedule, try another airline.

Travel Availability:

Departs DEN: Sept 27; Oct 1, 16, 23-25, 29-31; Nov 8
Departs KOA: Sept 27; Oct 1, 8-11; Nov 1, 8; Dec 19, 20, 25;

Use dates and book this on Expedia [expedia.com] or American Airlines [aa.com]. Bundling hotel with airfare will save money.