Cheap flights from Newark Airport to St. Louis from $61

In general, October is the cheapest month to fly from Newark Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $343. The month of May is another great option to travel to St. Louis, with average flight prices from Newark Airport averaging around $353.

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $316. 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 $439. 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 Newark Airport in the morning is the least expensive time of day to depart. momondo users have found prices as low as $349 when looking at flights departing in the morning. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $369 per ticket.

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

You are more likely to see cheaper flights to St. Louis from Newark Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $401 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Newark Airport for as low as $294 on momondo.

There are 4 cabin classes available to choose from on Newark 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 4% on your flight if you consider stops on a Newark Airport to St. Louis flight.

As of March 2026, prices for Newark Airport to St. Louis flights are approximately 34% more expensive when compared to flights at the same time last year.

United Airlines is the most popular carrier operating from Newark to Lambert-St Louis

United Airlines, Delta and American Airlines are the top three most popular airlines that fly to St. Louis from Newark Airport according to our data. United Airlines is the first choice among our users, with 82% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

Historically, on average around 15% of flights between Newark and St. Louis have experienced a delay on any given week. The average delay length over the past 12 months has been 172 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

Monday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 15% of their flights experiencing any sort of delay.

Atlanta (ATL) was the most common stop: 75% of momondo users choosing 1-stop flights on this route connected there.

Flights via Detroit (DTW) offer the lowest average round-trip price of $255.

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 5h 42m.

Atlanta (ATL) has the shortest average layover time for this route: 1h 18m.

As of March 2026, 4 flights take off from Newark Airport and land in St. Louis each day. The most common flight departure time for this route is 9:00PM, with 66% of daily flights taking off in the evening.

33 flights are operational weekly from Newark Airport to St. Louis as of March 2026. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.