If you're flying from LAX, this is the site for you!
They have started doing really uber cheap flights from LAX to XNA. The only problems are that it is probably at an inconvenient time and only flys Mondays and Fridays.
Los Angeles, CA to Bentonville/Fayetteville, AR or NorthWest Arkansas (same airport, both XNA)
If you leave on Friday October 2nd and come back on Monday October 5th, it is $79.00 each way...pretty cheap. For two people round trip, it would come to $385.40 (Or $192.70 round trip per person).
Drawbacks: There is only one flight on each of those days for this price and family would miss the rehearsal dinner and be leaving Monday night...much later than necessary for the weekend.
*We thought this might be helpful if you wanted to do a one-way cheap ticket and then get a convenient second ticket on another airline. The only cheap flights we found for other airlines was from LAX to XNA on Thursday October 1st is $160.00 one-way, Ontario to XNA is $144.00 one-way, we found them both on Orbitz.