Cheap flights from Oakland to Ontario from $52 OAK → ONT

Found recently, and the cheapest we hold

What have prices looked like?

Over 45 days, 28 Sept to 11 Nov, the cheapest return we saw each day was $91 to $1,589.

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

Could nearby dates be cheaper?

We hold no other 22-night return fares leaving within 3 days of 24 Dec to compare.

Every date we hold

32 fares on 3 departure dates

Which month looks cheapest?

November 2026 is the cheapest month — from $94.

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 42 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $52 to $208.

At $52, 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 5 Dec to compare.

Every date we hold

3 fares on 3 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $52.

Return

Fares 60 to 89 days before departure were typically 84% lower than 7 to 13 days before departure.

From the cheapest return each day between 28 Sept and 11 Nov (45 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 14 to 29 days before departure were typically 49% lower than 0 to 6 days before departure.

From the cheapest one-way 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.

How much is a return flight from Oakland to Ontario?

The cheapest return found recently is $840 with Alaska Airlines, 24 Dec to 15 Jan 2027, found 5 days ago. The cheapest return we hold, of any age, is $94 with Frontier Airlines, 26 Nov to 3 Dec, found 7 days ago. The cheapest return fare on each of 3 departure dates is usually $103 to $476.

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

The cheapest one-way found recently is $52 with Frontier Airlines, 5 Dec, found 4 days ago. The cheapest one-way fare on each of 3 departure dates is usually $110 to $185.

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

November 2026 is the cheapest month for a return, from $94, 26 Nov to 3 Dec, found 7 days ago. December 2026 is the cheapest month for a one-way, from $52, 5 Dec, found 4 days ago.

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

In 45 days of prices between 28 Sept and 11 Nov, return fares 60 to 89 days before departure were typically 84% lower than 7 to 13 days before departure. In 42 days of prices between 24 Sept and 11 Nov, one-way fares 14 to 29 days before departure were typically 49% lower than 0 to 6 days before departure.

Is there a direct flight from Oakland to Ontario?

Yes, the cheapest nonstop return found recently is $103 with Southwest Airlines, 26 Nov to 3 Dec, found 7 days ago.

How long is the flight from Oakland to Ontario?

The cheapest one-way found recently, with Frontier Airlines on 5 Dec, takes 6 h 3 min with 1 stop.

Which airlines have the cheapest flights from Oakland to Ontario?

Between 26 Nov and 24 Dec, Frontier Airlines has the cheapest return on 1 of the 3 departure dates we hold, Southwest Airlines on 1 and Alaska Airlines on 1. Between 22 Nov and 16 Dec, Frontier Airlines has the cheapest one-way on 2 of the 3 departure dates we hold, and Alaska Airlines on 1.