Cheap flights from Las Vegas to Ontario from $19 LAS → ONT

Found recently, and the cheapest we hold

What have prices looked like?

Over 42 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $42 to $216.

At $43, the cheapest return found recently is at the low end of that range.

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

Could nearby dates be cheaper?

We hold no other 1-night return fares leaving within 3 days of 30 Dec to compare.

Every date we hold

87 fares on 8 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $42.

Found recently, and the cheapest we hold

What have prices looked like?

Over 43 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $18 to $153.

At $19, the cheapest one-way found recently is at the low end of that range.

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

Could nearby dates be cheaper?

We hold no other one-way fares leaving within 3 days of 6 Jan 2027 to compare.

Every date we hold

25 fares on 22 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $18.

Return

Fares 14 to 29 days before departure were typically 80% lower than 0 to 6 days before departure.

From the cheapest return each day between 24 Sept and 11 Nov (42 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 82% lower than 0 to 6 days before departure.

From the cheapest one-way each day between 24 Sept and 11 Nov (43 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 Las Vegas to Ontario?

The cheapest return found recently is $43 with Frontier Airlines, 30 Dec to 31 Dec, found 2 days ago. The cheapest return we hold, of any age, is $42 with Frontier Airlines, 25 Dec to 1 Jan 2027, found 4 days ago. The cheapest return fare on each of 8 departure dates is usually $43 to $90.

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

The cheapest one-way found recently is $19 with Frontier Airlines, 6 Jan 2027, found 2 days ago. The cheapest one-way we hold, of any age, is $18 with Frontier Airlines, 1 Dec, found 3 days ago. The cheapest one-way fare on each of 22 departure dates is usually $29 to $69.

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

December 2026 is the cheapest month for a return, from $42, 25 Dec to 1 Jan 2027, found 4 days ago. It is the cheapest month for a one-way too, from $18, 1 Dec, found 3 days ago.

Every date in December 2026

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

In 42 days of prices between 24 Sept and 11 Nov, return fares 14 to 29 days before departure were typically 80% lower than 0 to 6 days before departure. In 43 days of prices between 24 Sept and 11 Nov, one-way fares 30 to 59 days before departure were typically 82% lower than 0 to 6 days before departure.

Is there a direct flight from Las Vegas to Ontario?

Yes, the cheapest nonstop return found recently is $43 with Frontier Airlines, 30 Dec to 31 Dec, found 2 days ago. The cheapest nonstop one-way found recently is $19 with Frontier Airlines, 6 Jan 2027, found 2 days ago.

How long is the flight from Las Vegas to Ontario?

The cheapest nonstop one-way found recently, with Frontier Airlines on 6 Jan 2027, takes 1 h 5 min from McCarran International Airport (LAS) to Ontario International Airport (ONT).

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

Between 17 Nov and 30 Dec, Frontier Airlines has the cheapest return on all 8 departure dates we hold. Between 16 Nov and 14 Mar 2027, Frontier Airlines has the cheapest one-way on 19 of the 22 departure dates we hold, and Southwest Airlines on 3.