Other budgets from St. Louis:
Best Deals from St. Louis Under $400
Sorted by estimated price. Fares fluctuate — set an alert to catch the lowest fare for your route.
How to Find Flights Under $400 from St. Louis
Book 6–10 weeks in advance
This is typically the sweet spot for international fares from St. Louis. Too early and airline seats aren't discounted yet; too late and inventory is tight. The $400 threshold is easiest to hit in shoulder season.
Fly mid-week
Tuesday and Wednesday departures from St. Louis consistently come in $50–150 less than Friday–Sunday. For short routes, this alone can push fares under $400.
Set a price alert
Fares to any of these destinations fluctuate hundreds of times per week. Set a Wildly alert at $400 or below and we'll text you the moment a fare drops to your target — no manual checking needed.
Frequently Asked Questions
Are there really international flights from St. Louis under $400?
Yes — 54 routes from St. Louis typically see round-trip fares at or below $400. These estimates are based on historical pricing and vary by season and booking lead time.
When is the best time to find flights from St. Louis under $400?
Shoulder seasons (April–May, September–October) typically offer the best prices. Flying mid-week (Tuesday–Wednesday) can save an additional $50–100. Book 6–10 weeks in advance for the best availability.
What is the cheapest destination from St. Louis?
Based on estimated pricing, Monterrey is one of the most affordable destinations from St. Louis at around $89 round trip.
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