St. Louis is a compact Midwest gateway, and its cheapest flights are almost all transatlantic — a tight cluster of European fares from London to Rome that give middle America a direct-ish reach across the Atlantic.
St. Louis Lambert (STL) has a genuine rarity for a mid-sized US airport: a light-rail link right at the terminals. MetroLink’s Red Line runs from the Lambert Airport stations into downtown — Union Station in about 35 minutes — for a flat $2.50 one-way, seven days a week from roughly 5am to 1am. After a flight, a $2.50 train straight downtown beats a cab across the metro every time. Buy tickets at the station machines; it’s the easy, cheap way in and out.
As a base, St. Louis is squarely a transatlantic-leisure airport. There’s little cheap short-haul here — the value is the European cluster, a set of fares that let middle America reach the continent without always backtracking to a coastal hub.
The British Isles and the cheapest European entry
The two cheapest fares are the gateways. London (€583) is the headline — the classic transatlantic entry point, with onward connections across Europe — and Dublin (€594) follows closely, with the bonus of US preclearance on the way home (you clear immigration in Ireland and arrive in the US as a domestic passenger). For a first hop across the Atlantic from the Midwest, these two are the obvious, best-value picks.
The Mediterranean and Iberia
Southern Europe clusters tightly. Malta (€659) is an unusual and welcome fare to the sun-baked island nation, while Porto (€676) and Madrid (€695) open Portugal and Spain, and Rome (€741) reaches Italy. These are the routes for a Mediterranean trip that starts in the Midwest — and because they cluster within about €80 of each other, it’s worth watching which dips first and building the trip around it.
Central and northern Europe
The rest of the board fills in the map. Stockholm (€671) reaches Scandinavia, Warsaw (€683) opens Poland and eastern Europe, and Brussels (€730) covers the Low Countries and the EU’s de facto capital. None are cheap in absolute terms, but all are reasonable transatlantic fares for a mid-sized airport — and each saves the time and hassle of connecting through a busier coastal gateway.
A note on these US-origin fares
This is a leisure-transatlantic board, and the figures are the lowest verified levels — they move sharply by season. European fares from the US are cheapest outside the summer peak: spring and autumn are your friends, and the dead of winter often hides the lowest numbers of all. Because St. Louis isn’t a fortress hub, these fares depend on connecting itineraries via larger gateways, so flexibility on dates and a willingness to take one stop will usually unlock the prices shown.
Cheapest destinations from St. Louis right now
Good-price round-trip targets from aifly’s own tracked fares — “good price” means book at or below this; nothing here is invented or scraped from third parties. The live deal page for each route shows the current fare.
| Destination | Good price | Why go |
|---|---|---|
| London | €583 | €583 — the classic transatlantic gateway, with onward connections across Europe. |
| Dublin | €594 | €594 to Ireland, with US preclearance on the way home — arrive domestic. |
| Malta | €659 | €659 — an unusual, welcome fare to the sun-baked island nation. |
| Stockholm | €671 | €671 to Scandinavia's elegant, island-strewn capital. |
| Porto | €676 | €676 to Portugal's atmospheric second city and the Douro valley. |
| Warsaw | €683 | €683 into Poland and the gateway to eastern Europe. |
| Madrid | €695 | €695 to Spain's grand, energetic capital. |
| Brussels | €730 | €730 to the Low Countries and the EU's de facto capital. |
| Rome | €741 | €741 to the Eternal City and the gateway to all of Italy. |
Frequently asked questions
What's the cheapest flight from St. Louis?
London at around €583 and Dublin at €594 are the cheapest — the classic transatlantic gateways, with Dublin offering US preclearance on the way home.
How do I get from St. Louis Airport into the city?
MetroLink's Red Line runs from the Lambert Airport stations into downtown — about 35 minutes to Union Station — for a flat $2.50, seven days a week from roughly 5am to 1am.
Is St. Louis a good airport for cheap flights to Europe?
It's primarily a transatlantic-leisure airport, with a tight cluster of European fares from London and Dublin (~€583–594) to Rome (€741), giving the Midwest direct-ish reach across the Atlantic.
Why are there no cheap short-haul flights from St. Louis here?
St. Louis isn't a fortress hub, so its best value is the transatlantic leisure cluster rather than cheap domestic or Caribbean hops. The European fares are the standout.
Do these St. Louis fares include a checked bag?
Transatlantic economy fares from the US vary — some bundle a bag, many charge separately, especially on basic-economy tickets. Confirm the allowance for your specific fare at booking.
How current are these St. Louis prices?
They're the lowest verified round-trip fares we've tracked recently and shift with season and demand. Use each as a benchmark and book when you see a fare at or below it, ideally outside the summer peak.
Seasons, carriers and airport details verified June 2026 and can change — confirm current conditions before you book.