Cheap flights from St. Louis to Brussels from $672
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Brussels departing on 6/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from St. Louis to Brussels
Cheap round-trip flights
Cheap one-way flights
Air Canada flights from St. Louis to Brussels
Our best Air Canada deals on St. Louis to Brussels flight tickets
KLM flights from St. Louis to Brussels
Our best KLM deals on St. Louis to Brussels flight tickets
See travel insights to Brussels from
How to get the cheapest flight ticket from St. Louis to Brussels
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Brussels?
In general, February is the cheapest month to fly from St. Louis to Brussels. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $690. If you are unable to visit Brussels during the month of February, then departing from St. Louis during the month March is also very affordable. Most momondo users find prices during this month for around $725.
What is the cheapest day to depart on your flight to Brussels?
On average, the least expensive day to fly to Brussels from St. Louis is on a Friday. momondo users have found tickets for Friday departures for as low as $1,035. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,431.
Cheap St. Louis to Brussels flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Brussels
How far is Lambert-St Louis to Brussels by plane?
There are 4389.6 mi between Lambert-St Louis and Brussels. By plane, this route typically takes 10h 40m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Brussels?
Prices for flights from Lambert-St Louis Airport to Brussels are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Brussels?
As of June 2025, there is 1 operator available to choose from for flights from Lambert-St Louis Airport to Brussels.
How old do you have to be to fly from Lambert-St Louis Airport to Brussels?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Brussels.
What documentation or ID do you need to fly to Brussels?
The travel and health documents required for your trip to Brussels can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Brussels. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
Best airlines flying from St. Louis to Brussels
Compare and see reviews for airlines that fly from St. Louis to Brussels with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $628 | Free Cancellation | Rating 7.4 8,798 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from St. Louis to Brussels?
Finding the right flight to Brussels from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Brussels quick and easy, saving you time and money.
Can I find flights from St. Louis to Brussels with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to Brussels from St. Louis with this policy.
How can momondo help me find flights from St. Louis to Brussels?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Brussels.
I’m not ready to book a flight from St. Louis to Brussels right now. Can momondo alert me if prices change?
If you are simply researching potential flights to Brussels, momondo offers a useful price alert feature which will track prices for flights to Brussels from St. Louis and alert you when they change.