Frontier Airlines has fares from many cities to Las Vegas priced at $54 or less. Many of these are western states airports, but three stand out fares from the east are Chicago $43.10 one-way, Pittsburgh $48.10 or St. Louis $48.10, and Atlanta or Columbus $53.10 one way. Plan on $25 to $35 for one carry-on or one checked bag each way. Fares are about $10 to $15 more each way for flights December to March.
Frontier One Way Fares to Las Vegas
$58.10 St. Louis STL (fare is $48.10 LAS-STL).
Other cities in the west with fares under $50 one way include
Under $75 one way
Frontier Airlines Atlanta ATL – Las Vegas LAS