To save up to 14% on this flight, we recommend booking at least 51 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from St Louis to Mongolia from $1,030 1-2 weeks out and tickets from $1,035 for flights departing within the next 72 hours.
Flights from St Louis to Mongolia lean towards being more expensive in December. Prices are generally better when you fly from St Louis to Mongolia in April, with the cheapest ticket starting at $728.