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

Return flights

10 Jan - 17 Jan	Southwest Airlines
11 Jan - 18 Jan	Southwest Airlines
12 Jan - 19 Jan	Southwest Airlines
13 Jan - 20 Jan	Southwest Airlines
14 Jan - 21 Jan	Southwest Airlines
06 Jan - 09 Jan	Southwest Airlines
15 Jan - 17 Jan	Southwest Airlines
16 Jan - 23 Jan	Southwest Airlines
17 Jan - 24 Jan	Southwest Airlines
19 Jan - 22 Jan	Southwest Airlines
30 Jan - 02 Feb	Hawaiian Airlines

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

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Ontario to Las Vegas in January from 198€

Return flights