A bridge over a calm river with a sunset sky.

Cheap Flights to St. Charles County | Popular Routes to St. Charles County from HK$2,264

View HK$2,264 flight on Tue, 21 Jul 2026Opens in a new window

Popular airlines to St. Charles County

  • American Airlines

  • Delta

  • United

  • Southwest Airlines

  • Alaska Airlines

  • Frontier Airlines

  • Air Canada

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 35% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap round-trip flights to St. Charles County

Prices were available within the past 7 days and start at HK$2,264 for one-way flights and HK$3,744 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sun, 12 Jul - Mon, 13 Jul
SAN
San Diego
STL
St. Louis
HK$3,744 Return, found 2 hours ago
HK$3,744
Return
found 2 hours ago
Select Delta flight, departing Sun, 12 Jul from San Diego to St. Louis, returning Mon, 13 Jul, priced at HK$3,744 found 2 hours ago
Delta
Fri, 10 Jul - Sun, 12 Jul
SAN
San Diego
STL
St. Louis
HK$4,184 Return, found 2 hours ago
HK$4,184
Return
found 2 hours ago
Select Delta flight, departing Fri, 10 Jul from San Diego to St. Louis, returning Sun, 12 Jul, priced at HK$4,184 found 2 hours ago
Delta
Fri, 10 Jul - Sun, 12 Jul
SAN
San Diego
STL
St. Louis
HK$4,195 Return, found 2 hours ago
HK$4,195
Return
found 2 hours ago
Select Delta flight, departing Fri, 10 Jul from San Diego to St. Louis, returning Sun, 12 Jul, priced at HK$4,195 found 2 hours ago
United
Tue, 21 Jul - Wed, 22 Jul
PHL
Philadelphia
STL
St. Louis
HK$4,528 Return, found 5 hours ago
HK$4,528
Return
found 5 hours ago
Select United flight, departing Tue, 21 Jul from Philadelphia to St. Louis, returning Wed, 22 Jul, priced at HK$4,528 found 5 hours ago
Delta
Fri, 10 Jul - Sun, 12 Jul
SAN
San Diego
STL
St. Louis
HK$4,582 Return, found 2 hours ago
HK$4,582
Return
found 2 hours ago
Select Delta flight, departing Fri, 10 Jul from San Diego to St. Louis, returning Sun, 12 Jul, priced at HK$4,582 found 2 hours ago
United
Fri, 10 Jul - Sun, 12 Jul
SAN
San Diego
STL
St. Louis
HK$4,624 Return, found 2 hours ago
HK$4,624
Return
found 2 hours ago
Select United flight, departing Fri, 10 Jul from San Diego to St. Louis, returning Sun, 12 Jul, priced at HK$4,624 found 2 hours ago
Delta
Fri, 10 Jul - Sun, 12 Jul
SAN
San Diego
STL
St. Louis
HK$4,625 Return, found 2 hours ago
HK$4,625
Return
found 2 hours ago
Select Delta flight, departing Fri, 10 Jul from San Diego to St. Louis, returning Sun, 12 Jul, priced at HK$4,625 found 2 hours ago
American Airlines
Fri, 10 Jul - Sun, 12 Jul
SAN
San Diego
STL
St. Louis
HK$4,862 Return, found 2 hours ago
HK$4,862
Return
found 2 hours ago
Select American Airlines flight, departing Fri, 10 Jul from San Diego to St. Louis, returning Sun, 12 Jul, priced at HK$4,862 found 2 hours ago
Aeromexico
Fri, 17 Jul - Sun, 19 Jul
MEX
Mexico City
STL
St. Louis
HK$8,396 Return, found 6 hours ago
HK$8,396
Return
found 6 hours ago
Select Aeromexico flight, departing Fri, 17 Jul from Mexico City to St. Louis, returning Sun, 19 Jul, priced at HK$8,396 found 6 hours ago
Air Canada
Fri, 10 Jul - Sun, 12 Jul
MEX
Mexico City
STL
St. Louis
HK$10,206 Return, found 6 hours ago
HK$10,206
Return
found 6 hours ago
Select Air Canada flight, departing Fri, 10 Jul from Mexico City to St. Louis, returning Sun, 12 Jul, priced at HK$10,206 found 6 hours ago

Frequently asked questions

How do I find cheap flights to St. Charles County that have flexible change policies?
We understand that things can change from one minute to the next, so booking a flexible ticket with Expedia is always a clever idea. Simply mark the "No change fee" box directly below the "Flexible change policies" filter. Your low-priced, flexible flight to St. Charles County is just a few clicks away.
Which airlines fly to St. Charles County?
When you're ready to reserve your seat to or near St. Charles County, these well-known carriers are waiting to welcome you on board:

  • Southwest Airlines - 2,214 flights to or near St. Charles County each month, including 2,214 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • American Airlines - 789 flights to or near St. Charles County each month, including 789 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • Delta Air Lines - 650 flights to or near St. Charles County each month, including 650 flights to Lambert-St. Louis Intl. Airport (STL) per month.

How can I find cheap tickets to St. Charles County?
An excellent strategy for walking away with cheap fares is to be flexible with your travel dates. Start by searching for your flight to St. Charles County, then click on the "flexible dates" link for a list of prices for nearby days. Want another tip? Book well ahead of time. To give you an idea of costs, HK$3,744 was the lowest price for a flight to St. Charles County in the last seven days.
How much is a flight to St. Charles County?
One-way flights taking off from Philadelphia (PHL) sold for as low as HK$2,264 in the last seven days. During this time, the price of a return airfare to St. Charles County varied between HK$3,744 and HK$10,206. If you find a deal, book as fast as you can — these fares don't stick around for long.
What are the most popular airports to fly into in St. Charles County?
Get ready to pack your bags and jet into Lambert-St. Louis Intl. Airport (STL), St. Charles County's leading flight hub. Lock in a seat on one of the 4,902 flights that land at this popular destination each month.
When is the cheapest time to fly to St. Charles County?
Fly out on a Tuesday to raise your chances of bagging the cheapest deal to St. Charles County. Mondays are usually the second most affordable day to take off. Saturday is typically the most expensive day to fly anywhere.
How much is a plane ticket to St. Charles County?
In the last seven days, plane tickets to St. Charles County fluctuated from HK$3,744 to HK$10,206.
What is the best time to go to St. Charles County?
Foristell, St. Charles County's most prominent city, is a terrific destination to explore at anytime. Not a big fan of chilly weather? Then journey here from June 20 onward during the summer months, when average temperatures vary from 18ºC to 29ºC. March, April and May is when Foristell is really buzzing.
What months are the cheapest to book a flight to St. Charles County?
A cheap month to score a fantastic deal to St. Charles County is February, whereas prices are at their highest in December. Keep clear of this month if you're on a tight budget.

Book with confidence

About St. Charles County

Expedia offers flights to St. Charles County to meet every traveller's needs. Whatever your flight need - Expedia has the flight for you. So choose from flights to St. Charles County or destinations around the world and discover how easy it is to make your flight reservations on Expedia.
About St. Charles County
*Available to Expedia members.