Cheap flights from Milwaukee to St. Louis from $86

In general, August is the cheapest month to fly from Milwaukee to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $286. The month of October is another great option to travel to St. Louis, with average flight prices from Milwaukee averaging around $287.

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $337. 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 $428. 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 Milwaukee in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $359 when looking at flights departing in the afternoon. In the evening is when there is more demand to fly to St. Louis, so prices are often more expensive at around $509 per ticket.

Fly from Milwaukee-Mitchell to Lambert-St Louis for the best Milwaukee-Mitchell - Lambert-St Louis flight prices

There is only 1 cabin class available to choose from on Milwaukee-Mitchell to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 11% on your flight if you consider stops on a Milwaukee to St. Louis flight.

Frontier, American Airlines, and Delta are the most popular carriers operating from Milwaukee-Mitchell to Lambert-St Louis

United Airlines, American Airlines and Southwest are the top three most popular airlines that fly to St. Louis from Milwaukee according to our data. United Airlines is the first choice among our users, with 44% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

1 flights are operational daily from Milwaukee to St. Louis as of February 2026. The most popular departure time for this route is 5:00AM, with 40% of flights per day taking off in the morning.

The number of flights available between Milwaukee and St. Louis is 8 per week as of February 2026. The most frequent departure day is Mon, with 25% of weekly flights leaving on this day.