St. Louis (STL) to Boston (BOS): Best Flight Deals & Travel Guide
Cheapest flight found
$145
Last updated Mar 13, 2026
Prices by Month
Price History
Tracking the May 7, 2026 departure — the cheapest date we found.
Price Behavior: STL → BOS
Based on 6 months of fare data collected by Trip Manta.
Lowest Fare
$145
Highest Fare
$271
Median Fare
$210
Price Spread
$126
Prices vary significantly — hourly tracking is especially valuable here.
Cheapest month to fly: May 2026 (from $145)
Most expensive month: July 2026 (from $271)
Biggest price drop caught: $127 between consecutive checks
Most frequent cheapest airline: Frontier
What This Means for You
Flights from St. Louis to Boston range from $145 to $271, a $126 spread across the months we track. If your dates are flexible, May 2026 tends to have the lowest fares. Because prices on this route change significantly, setting up hourly price alerts gives you the best chance of catching a short-lived drop before it corrects. We have caught drops as large as $127 between hourly checks on this route.
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From
St. Louis (STL)
To
Boston (BOS)
Airport Information
St. Louis (STL)
St. Louis Lambert International Airport (STL) serves as the primary gateway for the Missouri metropolitan area and is conveniently located just 14 miles northwest of downtown. As a major hub for Southwest Airlines, STL offers a wide range of domestic connections and features two main terminals. Travelers can enjoy local Missouri-themed dining options, efficient TSA checkpoints, and the convenience of the MetroLink light rail, which connects the airport directly to the city’s major sports stadiums and business centers.
Boston (BOS)
Boston Logan International Airport (BOS) is one of the busiest and most efficient transportation hubs in the Northeast, situated just across the harbor from the city center. The airport consists of four terminals—A, B, C, and E—all of which are linked by a complimentary shuttle bus system and the SL1 Silver Line. Logan is renowned for its modern amenities, including high-end seafood restaurants like Legal Sea Foods and plenty of workstations, making it a welcoming entry point for those ready to explore the historical landmarks of Massachusetts.
Frequently Asked Questions
How long is the average flight from St. Louis to Boston?
A direct flight from STL to BOS typically takes approximately 2 hours and 30 minutes, though return flights may take slightly longer due to prevailing headwinds.
Which airlines offer non-stop flights between STL and BOS?
Southwest Airlines and American Airlines frequently offer non-stop service on this route, providing convenient options for travelers looking to avoid layovers.
What is the best way to get from Logan Airport to downtown Boston?
The most cost-effective method is taking the Silver Line (SL1) bus, which is free from the airport to South Station, or utilizing the Blue Line subway for a quick trip into the city center.
Is there a time difference between St. Louis and Boston?
Yes, Boston is in the Eastern Time Zone, which is one hour ahead of the Central Time Zone used in St. Louis.
Are there lounge options available at STL while waiting for a Boston flight?
Yes, St. Louis Lambert offers a Wingtips Lounge in Terminal 2 and an American Airlines Admirals Club in Terminal 1, providing comfortable spaces for travelers to relax before departure.
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Our Methodology
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