The cheapest times to fly from STL to SLU are

  • January 8th to February 11th
  • March 5th to March 25th (except the week of March 12th)
  • May 28th to June 24th (except the week of June 11th)
  • August 20th to December 9th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from STL to SLU is mid October. Prices can be as high as $1843 for Sunday flights during mid July, or as low as $668 for Tuesday flights around mid October.


When to Fly to Saint Lucia

Flying from St. Louis, MO (STL) to St. Lucia (SLU) will usually cost between $715 to $1433 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid October with an average ticket price of $789. Due to high demand the most expensive time to fly is mid July, with an average price of $1603. Planning your trip to low-cost times can easily save you $815 on economy flights and even more on first-class flights. Generally, any price below $934 can be considered a good price for a round-trip STL to SLU flight.

See below for a graph of average weekly prices for the STL to SLU route. All prices are for round-trip tickets in USD.

STL to SLU Flight Prices

Compared to other flights, the STL to SLU flight is priced close to the average and costs about as much as the average flight leaving from St. Louis. The average price per mile (for a direct flight) is $0.23, which is below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $254 (23%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $813. Return trip prices are from the SLU to STL flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from STL to SLU can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 5 hour 26 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from STL to SLU while comparing.

Destination alternative #1: Maurice Bishop International Airport (GND) in Grenada

  • 149 miles (240 km) away from SLU
  • Usually 25.59% less expensive than SLU
  • 1-layover flights available

See STL to GND flights

Destination alternative #2: Grantley Adams International Airport (BGI) in Barbados/Bridgetown

  • 120 miles (193 km) away from SLU
  • Usually 23.55% less expensive than SLU
  • 1-layover flights available

See STL to BGI flights

Destination alternative #3: Hewanorra International Airport (UVF) in St. Lucia

  • 20 miles (32 km) away from SLU
  • Usually 8.03% less expensive than SLU
  • 1-layover flights available

See STL to UVF flights


Flight Questions Answered

Still have questions about flying from STL to SLU? We’ve got answers.

Which airlines fly this route?

You can find 5 major airlines flying this route most often: Air Canada, Air France, Caribbean Airlines, LIAT, United, and potentially more during busy seasons.

How far away is it from George F Charles Airport to St Louis Lambert International Airport?

The distance between the two airports is roughly 2473 miles or 3980 kilometers.

How long does it take to fly from STL to SLU?

The real-world flight time for a nonstop STL to SLU flight is about 5 hour 26 minutes.

How many flights go between St. Louis, MO and St. Lucia?

It depends on the day of the week and the date, but a typical day might have around 25 available flights from STL to SLU.


Airport Location Info


Departing Airport

Origination codeSTL
Origination airport nameSt Louis Lambert International Airport
CitySt. Louis, MO
Countrythe United States

Return Airport

Destination codeSLU
Destination airport nameGeorge F Charles Airport
CitySt. Lucia
CountrySt Lucia


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.