Book United St. Louis to Seattle flight deals from $270

Select journey type

Enter to select travel class and passengers

Search flights from St. Louis to Seattle (STL - SEA)

October

Skip to content

Tuesday 16th

Return Wednesday 31st
from$ 282*Viewed: 2 hours ago

Tuesday 23rd

Return Wednesday 7th
from$ 282*Viewed: 2 hours ago

Tuesday 30th

Return Wednesday 14th
from$ 270*Viewed: 2 hours ago

November

Skip to content

Tuesday 13th

Return Wednesday 28th
from$ 270*Viewed: 2 hours ago

Wednesday 14th

Return Thursday 29th
from$ 288*Viewed: 2 hours ago

Thursday 22nd

Return Friday 7th
from$ 306*Viewed: 2 hours ago

December

Skip to content

Saturday 1st

Return Sunday 16th
from$ 352*Viewed: 2 hours ago

Wednesday 12th

Return Thursday 27th
from$ 382*Viewed: 2 hours ago

Wednesday 19th

Return Thursday 3rd
from$ 370*Viewed: 2 hours ago
**Prices have been available for round trips within the last 48 hours and may not be currently available. Fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply..
Downtown Seattle at sunset

Plan ahead for flights from St. Louis to Seattle

from
to
Type
Dates
Price*
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Tue 30 Oct 2018
Return Wed 14 Nov 2018
from$ 270*Viewed: 2 hours ago
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Tue 13 Nov 2018
Return Wed 28 Nov 2018
from$ 270*Viewed: 2 hours ago
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Tue 16 Oct 2018
Return Wed 31 Oct 2018
from$ 282*Viewed: 2 hours ago
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Tue 23 Oct 2018
Return Wed 7 Nov 2018
from$ 282*Viewed: 2 hours ago
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Wed 14 Nov 2018
Return Thu 29 Nov 2018
from$ 288*Viewed: 2 hours ago
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Mon 15 Oct 2018
Return Tue 30 Oct 2018
from$ 292*Viewed: 2 hours ago
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Fri 19 Oct 2018
Return Sat 3 Nov 2018
from$ 292*Viewed: 2 hours ago
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Fri 26 Oct 2018
Return Sat 10 Nov 2018
from$ 292*Viewed: 2 hours ago
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Wed 17 Oct 2018
Return Thu 1 Nov 2018
from$ 300*Viewed: 2 hours ago
St. Louis (STL)
to Seattle (SEA)
Roundtrip
Depart Sat 20 Oct 2018
Return Sun 4 Nov 2018
from$ 300*Viewed: 2 hours ago
*Prices have been available for round trips within the last 48 hours and may not be currently available. Fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply.