Flights to Southern Illinois from Boston - ￥15,940

View ￥15,940 flight on Tue, Oct 7, 2025Opens in a new window

Popular airlines from Boston to Southern Illinois

  • Peach

    Peach

  • Skymark Airlines

    Skymark Airlines

  • All Nippon Airways

    All Nippon Airways

  • Japan Airlines

    Japan Airlines

  • Jetstar Japan

    Jetstar Japan

  • Solaseed Air

    Solaseed Air

  • STARFLYER

    STARFLYER

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 40% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Boston to Southern Illinois (BOS-STL)

Prices were available within the past 7 days and start at ￥15,940 for one-way flights and ￥52,560 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Mon, Aug 11 - Sat, Aug 16
BOS
Boston
STL
St. Louis
￥52,560 Roundtrip, found 6 days ago
￥52,560
Roundtrip
found 6 days ago
Select American Airlines flight, departing Mon, Aug 11 from Boston to St. Louis, returning Sat, Aug 16, priced at ￥52,560 found 6 days ago