Cheap flights from California to St. Louis from $63

In general, October is the cheapest month to fly from California to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $395. The month of September is another great option to travel to St. Louis, with average flight prices from California averaging around $399.

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $419. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $571. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

Flying to St. Louis from California in the evening is the least expensive time of day to depart. momondo users have found prices as low as $331 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $570 per ticket.

Fly from San Diego to Lambert-St Louis for the best California - Lambert-St Louis flight prices

You are more likely to see cheaper flights to St. Louis from California when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $433 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from California for as low as $378 on momondo.

There are 4 cabin classes available to choose from on California to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier, Southwest, and Delta are the most popular carriers operating from California to Lambert-St Louis

Southwest, United Airlines and American Airlines are the top three most popular airlines that fly to St. Louis from California according to our data. Southwest is the first choice among our users, with 47% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 7 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

14 flights are operational daily from California to St. Louis as of August 2026. The most popular departure time for this route is 5:00PM, with 77% of flights per day taking off in the afternoon.

The number of flights available between California and St. Louis is 104 per week as of August 2026. The most frequent departure day is Fri, with 26% of weekly flights leaving on this day.