Cheap flights from Ontario to Austin from $112 ONT → AUS

Found recently, and the cheapest we hold

What have prices looked like?

Over 43 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $164 to $416.

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

Could nearby dates be cheaper?

We hold no other 4-night return fares leaving within 3 days of 10 Dec to compare.

Every date we hold

51 fares on 6 departure dates

Which month looks cheapest?

November 2026 is the cheapest month — from $180.

Found recently, and the cheapest we hold

It is also the cheapest one-way we hold, of any age.

What have prices looked like?

Over 38 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $98 to $212.

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 14 Jan 2027 to compare.

Every date we hold

3 fares on 3 departure dates

Which month looks cheapest?

January 2027 is the cheapest month — from $112.

Return

Fares 30 to 59 days before departure were typically 50% lower than 0 to 6 days before departure.

From the cheapest return 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.

One-way

The cheapest fares were 14 to 29 days before departure.

From the cheapest one-way each day between 24 Sept and 11 Nov (38 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 Austin?

The cheapest return found recently is $237 with Frontier Airlines, 10 Dec to 14 Dec, found yesterday. The cheapest return we hold, of any age, is $180 with Frontier Airlines, 24 Nov to 8 Dec, found 6 days ago. The cheapest return fare on each of 6 departure dates is usually $228 to $238.

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

The cheapest one-way found recently is $112 with Frontier Airlines, 14 Jan 2027, found 3 days ago. The cheapest one-way fare on each of 3 departure dates is usually $120 to $170.

What is the cheapest month to fly from Ontario to Austin?

November 2026 is the cheapest month for a return, from $180, 24 Nov to 8 Dec, found 6 days ago. January 2027 is the cheapest month for a one-way, from $112, 14 Jan 2027, found 3 days ago.

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

In 43 days of prices between 24 Sept and 11 Nov, return fares 30 to 59 days before departure were typically 50% lower than 0 to 6 days before departure. In 38 days of prices between 24 Sept and 11 Nov, one-way fares were cheapest 14 to 29 days before departure.

Is there a direct flight from Ontario to Austin?

Yes, the cheapest nonstop return found recently is $359 with Southwest Airlines, 10 Dec to 14 Dec, found yesterday.

How long is the flight from Ontario to Austin?

The cheapest one-way found recently, with Frontier Airlines on 14 Jan 2027, takes 7 h 27 min with 1 stop.

Which airlines have the cheapest flights from Ontario to Austin?

Between 19 Nov and 10 Dec, Frontier Airlines has the cheapest return on all 6 departure dates we hold. Between 7 Dec and 15 Apr 2027, Frontier Airlines has the cheapest one-way on 2 of the 3 departure dates we hold, and Alaska Airlines on 1.