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Allegiant Air [allegiantair.com], an ultra low-cost air carrier based in Las Vegas, have roundtrip flights available for very low, compared to other airlines that fly the same routes. Allegiant have flights in and out of smaller regional airports and the majority of their flights are nonstop service.

Here are a few (random) examples.

Appleton WI (ATW) to St. Petersburg, FL (PIE) – $ 129; Departs May 31; Returns June 7 Albuerquerque NM (ABQ) to Los Angeles (LAX) – $ 90; Departs April 6, 9; Returns April 16, 20, 27