Cheapest return flights from Ontario to Las Vegas in March from $140

AirHint found the following cheapest return flights from Ontario (ONT) to Las Vegas (LAS) in March 2026 (see full year).

Return flights

03 Mar - 07 Mar Frontier Airlines direct
06 Mar - 09 Mar Frontier Airlines direct
19 Mar - 24 Mar Frontier Airlines direct
30 Mar - 02 Apr Frontier Airlines direct
02 Mar - 14 Mar Frontier Airlines direct
19 Mar - 23 Mar Frontier Airlines direct
03 Mar - 12 Mar Southwest Airlines
10 Mar - 13 Mar Frontier Airlines direct
04 Mar - 05 Mar Southwest Airlines direct
20 Mar - 22 Mar Frontier Airlines direct
15 Mar - 22 Mar Frontier Airlines direct
25 Mar - 03 Apr Southwest Airlines
22 Mar - 04 Apr Southwest Airlines direct

Also check the deals for one-way flights from Ontario to Las Vegas in March.

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