$189 Cheap United flights Seattle (SEA) to St. Louis (STL)

View $189 flight on Wed, Feb 4, 2026Opens in a new window

$189 Cheap United flights Seattle (SEA) to St. Louis (STL)

Prices were available within the past 7 days and start at $189 for one-way flights and $253 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Feb 4 - Tue, Feb 10
SEA
Seattle
STL
St. Louis
$253 Roundtrip, found 6 hours ago
$253
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Feb 4 from Seattle to St. Louis, returning Tue, Feb 10, priced at $253 found 6 hours ago
United
Wed, Feb 4 - Tue, Feb 10
SEA
Seattle
STL
St. Louis
$258 Roundtrip, found 6 hours ago
$258
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Feb 4 from Seattle to St. Louis, returning Tue, Feb 10, priced at $258 found 6 hours ago
United
Wed, Feb 4 - Tue, Feb 10
SEA
Seattle
STL
St. Louis
$268 Roundtrip, found 6 hours ago
$268
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Feb 4 from Seattle to St. Louis, returning Tue, Feb 10, priced at $268 found 6 hours ago
United
Wed, Feb 4 - Tue, Feb 10
SEA
Seattle
STL
St. Louis
$286 Roundtrip, found 6 hours ago
$286
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Feb 4 from Seattle to St. Louis, returning Tue, Feb 10, priced at $286 found 6 hours ago
United
Wed, Feb 4 - Tue, Feb 10
SEA
Seattle
STL
St. Louis
$292 Roundtrip, found 6 hours ago
$292
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Feb 4 from Seattle to St. Louis, returning Tue, Feb 10, priced at $292 found 6 hours ago
United
Wed, Feb 4 - Tue, Feb 10
SEA
Seattle
STL
St. Louis
$299 Roundtrip, found 6 hours ago
$299
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Feb 4 from Seattle to St. Louis, returning Tue, Feb 10, priced at $299 found 6 hours ago

Find the cheapest month to fly from Seattle (SEA) to St. Louis (STL)

January is typically the cheapest month to fly

From $126 - $222 per traveler.

Alternative airports near St. Louis

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

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $225
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $225
Flights from Seattle (SEA) to St. Louis (STL)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Popular airline
Delta
Distance
2728 km
Average flight time
5 hours 52 mins