United Flight WN1603 Deals & Information (2025/2026)

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United Flight 1603 Route Deals From $152

The cheapest prices found with in the last 7 days for return flights were $237 and $152 for one-way flights to San Francisco Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Oct 27 - Thu, Nov 6
STL
Lambert-St. Louis Intl.
SFO
San Francisco Intl.
$237 Roundtrip, found 1 day ago
$237
Roundtrip
found 1 day ago
Select United flight, departing Mon, Oct 27 from Lambert-St. Louis Intl. to San Francisco Intl., returning Thu, Nov 6, priced at $237 found 1 day ago
Fri, Dec 12 - Tue, Dec 16
STL
Lambert-St. Louis Intl.
SFO
San Francisco Intl.
$298 Roundtrip, found 3 days ago
$298
Roundtrip
found 3 days ago
Select United flight, departing Fri, Dec 12 from Lambert-St. Louis Intl. to San Francisco Intl., returning Tue, Dec 16, priced at $298 found 3 days ago