Cheap flights from Pennsylvania to Los Angeles from $123

In general, September is the cheapest month to fly from Pennsylvania to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $359. If you aren’t able to travel during the month of September, then book flights to Ontario from Pennsylvania during February instead. Flights to Ontario in February, while not as cheap as those in September, still average around $379.

You are more likely to see cheaper flights to Ontario from Pennsylvania when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $404 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Pennsylvania for as low as $285 on momondo.

Frontier, Delta, and Alaska Airlines are the most popular carriers operating from Pennsylvania to Ontario

American Airlines, United Airlines and Southwest are the top three most popular airlines that fly to Ontario from Pennsylvania according to our data. American Airlines is the first choice among our users, with 67% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 8 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

The number of flights available between Pennsylvania and Ontario is 4 per week as of November 2026. The most frequent departure day is Mon, with 25% of weekly flights leaving on this day.

Average flight duration from Pennsylvania to Ontario depends on which airport you fly into and out of. Flying from Pittsburgh to Los Angeles is 5h 28m on average, while flying from Philadelphia to Los Angeles is 5h 55m on average. Los Angeles is the most popular airport in Ontario.