The average cost for a honeymoon in the United States can range from around $3,500 to upwards of $12,000 or more, depending on the location and length of your trip.
Accommodations are your biggest expense while honeymooning. Prices ranges from $200-$300/night for a basic hotel room, $400-600/night for a nicer hotel, and $800+/night for a luxury resort.
Flights can also differ widely in price depending on when and where you fly from/to. Try to book flights as far in advance as possible for lower prices.