Seattle to Cahokia/St Louis (SEA–CPS) — Airlines, Schedules & Connections

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1,722 mi airlines 1/wk
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Connecting Flight Schedule 20 1-stop flights Verified 4d ago
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  Flight Airline AC Dep Arr Dur OTP Sched  
✈ Nonstop

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No nonstop flights on this route. connecting options below.

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✧ 2-STOP Loading... Reach the hardest destinations
Seattle to Cahokia/St Louis
1 carrier, 1 flights/week nonstop.
1 Airlines 1 Flights/wk 1,722 mi 3h 34m nonstop +2h ahead 20 1-stop hubs

SEA–CPS is served by 1 airline with nonstop service. Sun Country Airlines leads the route. The flight covers 1,722 miles in approximately 3h 34m. Beyond nonstop, 20 hubs offer 1-stop connections.

Also explore SEA Routes CPS Routes SEA Live Flights CPS Live Flights SEA Delays
Carriers on this route

Airline Landscape

All carriers operating nonstop SEA–CPS service, compared side by side.
Airline Freq/wk Aircraft Duration Dep OTP Alliance Codeshares
SY Sun Country Airlines 1 – – 82% – –
Alliance coverage
Unaffiliated: SY (1 flights/wk, 100%)
OTP based on airport-level delay snapshots. Duration ranges reflect seasonal/directional variation.
Connections

Connection Landscape

Beyond nonstop. 1-stop and 2-stop options for SEA to CPS.
1-STOP
One-Stop Connections
20
Hubs
~5h
Fastest
~29h
Longest
Verified with published schedule alignment and minimum connection time.
2-STOP
Two-Stop Connections
56
Candidates
Two-stop connections loaded in the connections tab above.
Connections computed from published schedules with minimum connection time verification. Use the interactive explorer above the fold to filter by airline, tier, and layover time.
Know before you go

Travel Essentials

Practical planning for this route.
Time Difference
+2h
Cahokia/St Louis is 2 hours ahead of Seattle.
SEA: PDT · CPS: CDT

When it's 6:00 PM in Seattle, it's 8:00 PM in Cahokia/St Louis.
Distance & Flight Time
1,722 mi / 2,771 km
Nonstop flight time is approximately 3h 34m.
Getting to SEA

Link Light Rail runs from downtown Seattle (Westlake station) to the airport in 38 minutes ($3.50 peak). Trains run every 6–12 minutes during peak hours from 5am to 1am. Ride-shares run $30–50 from downtown; SR-99 and I-5 can be heavily congested southbound during afternoon rush (3–7pm).

Sound Transit 574 express bus serves Tacoma ($2.50–4). Sounder commuter rail connects Tacoma to the airport area via a shuttle.

Facts

SEA–CPS Quick Facts

Key statistics for the Seattle to Cahokia/St Louis route.
Route details
Distance1,722 mi / 2,771 km
Flight time3h 34m
Time difference+2 hours
Airlines (nonstop)1
Weekly flights1 out / 1 return
1-stop connections20 hubs
Origin: SEA
Full nameSeattle–Tacoma International Airport
IATA / ICAOSEA / KSEA
TimezoneAmerica/Los_Angeles
Passengers/yr52.6M
Elevation433 ft / 132 m
Destination: CPS
Full nameSt Louis Downtown Airport
IATA / ICAOCPS / KCPS
TimezoneAmerica/Chicago
Elevation413 ft / 126 m
FAQ

Frequently Asked Questions

Common questions about SEA to CPS flights.
Nonstop flights from Seattle–Tacoma International Airport to St Louis Downtown Airport take approximately 3h 34m. The route covers 1,722 miles.
1 airline operates nonstop service: Sun Country Airlines.
There are approximately 1 nonstop flights per week from SEA to CPS. The return direction has about 1 weekly flights.
Yes, 1-stop connections are available through LAS, PIT, SJC, PHX, CLT, IAD, CLE, PHL, BNA, RSW, LAX, BOS, FLL, JFK, MIA, MDW, IAH, AUS, DAL and DFW. These options provide additional schedule flexibility.
Cahokia/St Louis is 2 hours ahead of Seattle.
Yes, return flights from CPS to SEA are available. Use the direction toggle at the top to view the return schedule.
Click the 'Search Flights' button to check availability and prices on Google Flights. You can also compare airlines and schedules on this page to find the best option.
See the On-Time Performance section for the latest delay data at both airports. This shows departure and arrival reliability to help you plan.
Route data is updated regularly from official airline schedules. On-time performance data comes from recent airport delay snapshots.

Flights from SEA to CPS

Seattle–Tacoma International Airport (SEA) and St Louis Downtown Airport (CPS) are connected by nonstop service from Sun Country Airlines. With 1 weekly departures, this is a regularly served route.

SEA to CPS Flight Duration and Schedule

Nonstop flight time from SEA to CPS ranges from 3 hours 34 minutes. The route covers a distance of 1,722 miles (2,771 km). There are approximately 1 weekly flights outbound and 1 return, totaling 2 flights per week in both directions.

Connecting Options and Alternatives

20 one-stop connections are available, with the fastest taking approximately 5 hours via LAS. Two-stop connections are also available via intermediate hubs.