Cheap flights from Ontario to Las Vegas from $21 ONT → LAS

Found recently, and the cheapest we hold

What have prices looked like?

Over 49 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $29 to $113.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

No. We hold 3-night return fares on 1 other departure date within 3 days of 22 Nov, and it is not cheaper.

Every date we hold

222 fares on 27 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $33.

Found recently, and the cheapest we hold

What have prices looked like?

Over 49 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $18 to $61.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

No. We hold one-way fares on 4 other departure dates within 3 days of 30 Dec, and none is cheaper.

Every date we hold

67 fares on 34 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $20.

Return

Fares 14 to 29 days before departure were typically 83% lower than 0 to 6 days before departure.

From the cheapest return each day between 24 Sept and 11 Nov (49 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

One-way

Fares 30 to 59 days before departure were typically 64% lower than 0 to 6 days before departure.

From the cheapest one-way each day between 24 Sept and 11 Nov (49 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

How much is a return flight from Ontario to Las Vegas?

The cheapest return found recently is $111 with Frontier Airlines, 22 Nov to 25 Nov, found 2 days ago. The cheapest return we hold, of any age, is $33 with Frontier Airlines, 5 Dec to 9 Dec, found 3 days ago. The cheapest return fare on each of 27 departure dates is usually $46 to $140.

How much is a one-way flight from Ontario to Las Vegas?

The cheapest one-way found recently is $21 with Frontier Airlines, 30 Dec, found 2 days ago. The cheapest one-way we hold, of any age, is $20 with Frontier Airlines, 2 Dec, found 7 days ago. The cheapest one-way fare on each of 34 departure dates is usually $23 to $118.

What is the cheapest month to fly from Ontario to Las Vegas?

December 2026 is the cheapest month for a return, from $33, 5 Dec to 9 Dec, found 3 days ago. It is the cheapest month for a one-way too, from $20, 2 Dec, found 7 days ago.

Every date in December 2026

How far ahead should I book a flight from Ontario to Las Vegas?

In 49 days of prices between 24 Sept and 11 Nov, return fares 14 to 29 days before departure were typically 83% lower than 0 to 6 days before departure. One-way fares 30 to 59 days before departure were typically 64% lower than 0 to 6 days before departure.

Is there a direct flight from Ontario to Las Vegas?

Yes, the cheapest nonstop return found recently is $111 with Frontier Airlines, 22 Nov to 25 Nov, found 2 days ago. The cheapest nonstop one-way found recently is $21 with Frontier Airlines, 30 Dec, found 2 days ago.

How long is the flight from Ontario to Las Vegas?

The cheapest nonstop one-way found recently, with Frontier Airlines on 30 Dec, takes 1 h 4 min from Ontario International Airport (ONT) to McCarran International Airport (LAS).

Which airlines have the cheapest flights from Ontario to Las Vegas?

Between 13 Nov and 17 Jun 2027, Frontier Airlines has the cheapest return on 25 of the 27 departure dates we hold, and Southwest Airlines on 2. Between 13 Nov and 14 Sept 2027, Frontier Airlines has the cheapest one-way on 30 of the 34 departure dates we hold, Southwest Airlines on 2 and United Airlines on 1.