Boston to St Louis
BOSSTL
Fly from Boston to St Louis starting at USD 81 with F9.
Best fare available on May 18, 2026.
Limited seats. Better plans. Book before it's gone.
Boston to St Louis cheapest flights this week
18 May
F9
10:17BOS
--:--STL
1 Stop$81VIEW DEAL
Boston to St Louis monthly flight fare trend
Apr
from USD 148
May
from USD 81
Jun
No flights
Jul
No flights
Aug
No flights
Sep
No flights
Airport Details
Origin
Boston
Logan International Airport (BOS)
Boston, BOS
Zone
New York
Elev
20 ft
Destination
St Louis
St. Louis Lambert International Airport (STL)
St Louis, STL
Zone
Chicago
Elev
618 ft
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