$158 Cheap United flights St. Louis (STL) to San Juan (SJU)

View $158 flight on Sun, Jan 4, 2026Opens in a new window

$158 Cheap United flights St. Louis (STL) to San Juan (SJU)

Prices were available within the past 7 days and start at $158 for one-way flights and $285 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Jan 5 - Tue, Jan 13
STL
St. Louis
SJU
San Juan
$285 Roundtrip, found 1 day ago
$285
Roundtrip
found 1 day ago
Select United flight, departing Mon, Jan 5 from St. Louis to San Juan, returning Tue, Jan 13, priced at $285 found 1 day ago

Find the cheapest month to fly from St. Louis (STL) to San Juan (SJU)

January is typically the cheapest month to fly

From $138 - $504 per traveler.

Alternative airports near San Juan

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Luis Munoz Marin Intl. SJU. Cheapest option available. Average driving time to city center is 16 minutes. Flights from $236
SJU
Luis Munoz Marin Intl.
Cheapest
Average driving time to city center16 min
Flights from $236
Flights from St. Louis (STL) to San Juan (SJU)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Luis Munoz Marin Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines
Popular airline
American Airlines
Distance
3239 km
Average flight time
4 hours 20 mins