$159 Cheap Delta flights White Plains (HPN) to St. Louis (STL)

Landing cheap one-way Delta Air Lines flights from HPN to STL from $159 on Expedia is a breeze — just filter by “Price (lowest to highest).” Alternatively, check out our affordable return fares from $261 for your next exciting adventure.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Delta Air Lines flights to St. Louis are often cheaper in the quieter months of January and February. Whether you’re searching for a one-way or round-trip ticket, you could find a better deal then.

Search for affordable Delta Air Lines flights from Westchester County Airport (HPN) to Lambert-St. Louis Intl. Airport (STL) one to three months before your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare type and journey, the best day of the week to book a domestic flight is usually Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Fill in your dates, press search and use the “Nonstop” filter on Expedia to find any direct flights from HPN to STL with Delta Air Lines or other carriers.

To find the earliest departure from HPN to STL with Delta Air Lines, filter your search by “Early Morning” and “Morning.” Booking an early flight generally means you’re less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Lambert-St. Louis Intl. Airport (STL) is the main St. Louis hub for Delta Air Lines flights from Westchester County Airport (HPN).

Offering an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is the leading choice for many passengers heading from HPN to STL. Plus, if you’re a Delta SkyMiles and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be used on future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on your ticket type, a fee will generally apply if you cancel or reschedule your booking more than 24 hours after it’s confirmed. To find flexible fares, select our “Changes included” and “No cancel fee” boxes when you search for flights. For additional information on modifying or canceling your reservation, head to “Trips,” select your flight and click on “Manage Booking.”