Cheap Flights from Boston to Saint Mary's from €875️ (BOS-KSM)

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Flights from Boston to Saint Mary's Starting at €875

For as little as €875, you can take your next adventure to Saint Mary's without breaking the bank. Choose between one-way and return tickets from Boston below.

One way
Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Find the best time to fly from Boston to Saint Mary's

Price trend charts are a great way of tracking how much your flights cost in the lead up to departure and can help you choose when to book your tickets. See how prices to Saint Mary's from Boston have changed and are set to move below.

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Airlines Flying from Boston to Saint Mary's

Which airline provides the cheapest flights from Boston to Saint Mary's? Discover the option that best suits your travel needs before embarking on your journey.

Alaska Airlines

From €875

Delta Air Lines

From €1,116

Hawaiian Airlines

From €1,840

Find more flights and airlines

Alternative Routes from Boston to Saint Mary's

Did you know that you can save money and time on an alternative route from Boston to Saint Mary's? Check out some of the different available routes below.

Cheapest
BOS
17:55
23h 45m
2 transfer
KSM
13:40
General Edward Lawrence Logan International Airport - Saint Mary's Airport
Tue, Jan 7Alaska Airlines
€875
BOS
17:55
23h 45m
2 transfer
KSM
13:40
General Edward Lawrence Logan International Airport - Saint Mary's Airport
Tue, Jan 7Alaska Airlines
€875
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FAQ

When are flight tickets from Boston (BOS) to Saint Mary's (KSM) the cheapest?
Airlines adjust prices for flights from Boston to Saint Mary's based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the cheapest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much are flights from Boston (BOS) to Saint Mary's (KSM) cost?
According to Trip.com's data, the lowest price is around €926.
How many airports in Saint Mary's (KSM)?
There are 1 airport(s) in Saint Mary's (KSM): Saint Mary's Airport.

How to find a cheap flight from Boston to Saint Mary's

Understanding the common pitfalls when booking your flight tickets can help you save massively when it comes time to fly. We’ve listed our six essential steps to keep in mind when you’re booking flight tickets to help you find the best price.

Book Early

Once prices are gone, they're gone. Lock in deals while you can!

Compare Flight Prices

Compare prices on travel agency and airline websites.

Look Out for Deals

Check airline and travel agency websites for latest flight deals

Check One-way Fares

Buying two cheap one-way flights can sometimes be a better deal than a round-trip.

Try Different Dates

Flying during the week, early in the morning, or late at night can help save money.

Use the Trip.com App

Save up to £10 per person when booking your flights on Trip.com