$839 Find Cheap Flights from St. Louis to West Yellowstone - Compare and Save

Flights from St. Louis to West Yellowstone usually depart from Lambert-St Louis (STL) and arrive at West Yellowstone (WYS).

Only Economy Class is available on flights from St. Louis to West Yellowstone.

Connecting flights from St. Louis to West Yellowstone most commonly pass through:

• Denver Intl (DEN) - 88% of one-stop connections
• Salt Lake City (SLC) - 13% of one-stop connections
Together, these airports account for 101% of one-stop bookings on this route.

Yes. Being flexible with your travel dates can save you up to 68% on the St. Louis to West Yellowstone route. Wednesday is the cheapest departure day at $356 round-trip on average, while Thursday is the most expensive at $1,091, a difference of $735. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

There are currently no nonstop flights available from St. Louis to West Yellowstone. Flights with 1 layover take between 6h 09m and 6h 23m in total, depending on the connection.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time at 6h 09m, compared with 6h 23m via Salt Lake City (SLC).

West Yellowstone is 1 hour behind St. Louis (Mountain Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

Round-trip flights from St. Louis to West Yellowstone range from $583 to $1,031, with an average of $594 over the past 12 months. Anything below $583 counts as a good deal.