Cheap flights from San Antonio to Ontario

One-way fares from $105 · SAT → ONT · prices found by travellers in the last 48 hours

Compare all dates Ontario → San Antonio
Cheapest fare
$105

Frontier Airlines · Tue, Dec 1

Cheapest month
December

from $105

Direct flights
Not recently

Usually 1+ stop

Quickest trip
4h 10m

1,880 km

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Cheapest month to fly from San Antonio to Ontario

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 $174
  2. December 2026 Cheapest $105

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About flights from San Antonio to Ontario

San Antonio (SAT) and Ontario (ONT) are about 1,880 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 4h 10m. Over the next few months, one-way fares start from $105, and December 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from San Antonio to Ontario?

The cheapest one-way fare we've seen recently is $105 with Frontier Airlines, departing Tuesday, December 1, 2026. Over the coming months, the lowest fare in each month ranges from $105 to $174.

What is the cheapest month to fly from San Antonio to Ontario?

December 2026 currently has the lowest fares, from $105 one way.

Are there direct flights from San Antonio to Ontario?

We haven't seen direct fares recently, so most journeys include at least one stop.

How long is the flight from San Antonio to Ontario?

The quickest journey we've seen takes about 4h 10m. San Antonio and Ontario are around 1,880 km apart.

Which airlines fly from San Antonio to Ontario?

Recent fares on this route were with Frontier Airlines.

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