Originally Posted by
supacoo
I wouldn't worry - many times the LAX-DEN flight arrives early thanks to favorable winds. But if worse comes to worst, it's only a eight hour drive to Omaha through some of America's least scenic countryside

It's the BEST drive ever! You just point the car NE for 2 hours, then due East for 6. It's great for driving and napping at the same time.
Back to the OP, you should be OK with that amount of time. I connected in DEN for 8 years out of OMA and LNK with little trouble in the mornings.
DEN