$461 Cheap Flights from Baltimore (BWI) to Sao Luis (SLZ)

View $461 flight on Fri, Nov 28, 2025Opens in a new window

Popular airlines from Baltimore Washington Intl. Airport (BWI) to Sao Luis (SLZ-Marechal Cunha Machado Intl.)

Cheap Flights from Baltimore to Sao Luis (BWI-SLZ)

Prices were available within the past 7 days and start at $461 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

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Flights from Baltimore (BWI) to Sao Luis (SLZ)
Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Marechal Cunha Machado Intl.
Distance
3544 mi

Baltimore to Sao Luis Flights

The cheapest times to fly from Baltimore to Sao Luis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Baltimore to Sao Luis are during the month of . You can find some of the cheapest flights from Baltimore to Sao Luis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Baltimore to Sao Luis

Sunday is one of the best days to book for cheap flights from Baltimore to Sao Luis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Baltimore to Sao Luis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Baltimore to Sao Luis in 2025. You can also book with separate airlines for your outbound and return journeys, from $461 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Baltimore to Sao Luis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Baltimore to Sao Luis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ) cost?
Get a cheap one-way flight from $461 or cheap return flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ)?
The cheapest month to fly from BWI to SLZ is , when demand is low. Off-peak months are generally when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest BWI to SLZ flight.
How many flights per day from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ)?
You'll have to hop on a flight with a layover if you're traveling from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from BWI to SLZ?
Usually you'll find the largest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can change depending on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ)?
To touch down at Marechal Cunha Machado Intl. Airport (SLZ) without delays, pick a flight that takes off from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ) last-minute?
Last-minute fares from BWI to SLZ are generally more expensive. For the lowest prices, start searching for flights as soon as possible. That said, if your travel plans are flexible, you may land a cheap fare just before your departure.
Is it cheaper to book a BWI to SLZ flight and hotel package?
Compared with arranging flights and hotels separately, booking a BWI to SLZ flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one place will take the stress out of travel planning. Just secure your flights and select from our extensive range of hotels, then customize your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ)?
Typically, you can cancel or modify your BWI to SLZ flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you'd like more information, visit our Customer Service portal.

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*Available to One Key members.