$725 Cheap Flights from St. Louis (STL) to Rennes (RNS)

View $725 flight on Sat, Aug 23, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Rennes (RNS-Saint-Jacques)

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from St. Louis to Rennes (STL-RNS)

Prices were available within the past 7 days and start at $725 for one-way flights and $1,010 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, Dec 24 - Fri, Jan 9
STL
St. Louis
RNS
Rennes
$1,010 Roundtrip, found 6 days ago
$1,010
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, Dec 24 from St. Louis to Rennes, returning Fri, Jan 9, priced at $1,010 found 6 days ago
KLM
Mon, Dec 8 - Sun, Dec 21
STL
St. Louis
RNS
Rennes
$1,113 Roundtrip, found 6 days ago
$1,113
Roundtrip
found 6 days ago
Select KLM flight, departing Mon, Dec 8 from St. Louis to Rennes, returning Sun, Dec 21, priced at $1,113 found 6 days ago
Flights from St. Louis (STL) to Rennes (RNS)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Saint-Jacques
Roundtrip price
$1,010
Distance
4245 mi

St. Louis to Rennes Flights

The cheapest times to fly from St. Louis to Rennes

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Rennes are during the month of December. You can find some of the cheapest flights from St. Louis to Rennes with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Rennes

Sunday is one of the best days to book for cheap flights from St. Louis to Rennes: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Rennes

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Rennes in 2025. You can also book with separate airlines for your outbound and return journeys, from $725 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Rennes flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Rennes airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS) cost?
Secure a cheap one-way flight from $725 or cheap return flight from $1,010 from Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS)?
Flying in December can help you save, as it's the cheapest month for flights between STL and RNS. You'll usually find the lowest prices during off-peak months.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS)?
To find the cheapest airline that'll fly you from STL to RNS, use Expedia's filter tool. Tailor your search based on your travel needs, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS)?
You'll need to take a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to find an option that works for you.
What day of the week has the most flights from STL to RNS?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change based on a number of factors, including the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS)?
To avoid possible delays on the Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS) route, aim to fly before 3 PM. Departures after this hour are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS) last-minute?
Booking your plane ticket from STL to RNS shortly before your getaway is generally more expensive. But if there's some wiggle room with your travel dates and times, you could land a cheap last-minute fare.
Is it cheaper to book a STL to RNS flight and hotel package?
Securing a STL to RNS flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Pick from our wide range of accommodations and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Saint-Jacques Airport (RNS)?
If you reserved your STL to RNS flight within the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal if you want more information.

Explore a world of travel with Expedia

*Available to One Key members.