Cheap flights from Arizona to St. Louis from $82

In general, January is the cheapest month to fly from Arizona to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $319. The month of February is another great option to travel to St. Louis, with average flight prices from Arizona averaging around $329.

The cheapest day to depart on your flight to St. Louis is on a Saturday when prices can be found for as low as $377. 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 Sunday because tickets tend to average around $486. 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 Arizona in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $362 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $438 per ticket.

Fly from Phoenix Sky Harbor Intl to Lambert-St Louis for the best Arizona - Lambert-St Louis flight prices

You are more likely to see cheaper flights to St. Louis from Arizona when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $380 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Arizona for as low as $329 on momondo.

There are 3 cabin classes available to choose from on Arizona 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, Delta, and United Airlines are the most popular carriers operating from Arizona to Lambert-St Louis

Southwest, American Airlines and Frontier are the top three most popular airlines that fly to St. Louis from Arizona according to our data. Southwest is the first choice among our users, with 43% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 4 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

The number of flights available between Arizona and St. Louis is 2 per day as of September 2026. The most frequent departure time is 8:00AM, with 40% of daily flights leaving in the afternoon.

17 flights are operational weekly from Arizona to St. Louis as of September 2026. The most popular departure day for this route is Mon, with 35% of flights per week taking off on this day.