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$312 Cheap Frontier Airlines flights Boston (BOS) to San José (SJO)

View $312 flight on Sat, Aug 8, 2026Opens in a new window

$312 Cheap Frontier Airlines flights Boston (BOS) to San José (SJO)

Prices were available within the past 7 days and start at $312 for one-way flights and $661 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Aug 5 - Sun, Aug 16
BOS
Boston
SJO
San José
$661 Roundtrip, found 1 day ago
$661
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Aug 5 from Boston to San José, returning Sun, Aug 16, priced at $661 found 1 day ago

Find the cheapest month to fly from Boston (BOS) to San José (SJO)

September is typically the cheapest month to fly

From $344 - $422 per traveler.

Travel information

Origin airport
Logan Intl.
Destination airport
Juan Santamaría Intl.
Airlines serving
Aeromexico, Air Canada, American Airlines, Copa, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, United, avianca
Popular airline
Air Canada
Distance
3798 km

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