prices we've seen · United States fares · USD
The cheapest one-way fare from St Louis (STL) to Las Vegas (LAS) we have seen is $177 USD, departing Nov 21, 2026 (seen Nov 11, 2026): Frontier F9 2636, 1 stop, 16h 14m.
Cheapest · One wayseen Nov 11
$177 USD
Frontier F9 2636 · Nov 21 · 1 stop · 16h 14m
Continue on the seller's site — $177Cheapest round tripseen Nov 8
$300 USD
Southwest Airlines WN 2229 · Dec 24 → Jan 1 · Nonstop · 6h 40m in all, both ways
Continue on the seller's site — $300a2bflight may earn a commission from the seller if you book after this click; the price you see is the seller's and does not change. How we rank, what we keep.
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Checked Nov 11
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Each day's cheapest fare we've seen, nonstop and with stops. Cheapest first.
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The cheapest round trips we've seen on this route, on any dates, cheapest first.
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Compared with St Louis → Las Vegas: $177 one way (Nov 21).
Marketing carriers; the operating airline is shown by the seller.
The cheapest one-way fare from St Louis (STL) to Las Vegas (LAS) we have seen is $177 USD, departing Nov 21, 2026 (seen Nov 11, 2026): Frontier F9 2636, 1 stop, 16h 14m.
Nonstop fares were seen on 3 of the 3 departure dates; carriers seen: Frontier, Southwest Airlines.
By month, Feb 2027 is the cheapest we've seen at $113 USD and Nov 2026 the most expensive at $177 USD — a spread of 57%.
It is the cheapest fare we've seen for that date; the date beside it is the day it was seen, or our last check. We look again at least once a day for the routes people search, and stop showing a route's prices two days after our last look. The seller's page shows the price right now.
By price and duration only; commission never enters the order. Cheapest means cheapest among the fares we've seen for this route. A click that books may earn a2bflight a commission from the seller; the price you see is the seller's own. See how we rank and what we keep.