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

SEA Airport Page →
1,722 mi airlines charter/private
On-time Some delays Frequent delays
Connecting Flight Schedule 14 1-stop flights Verified 1mo ago
Nonstop Charter / private 1-Stop 2-Stop Hide separate tickets Hide overnight Hide codeshares
  Flight Airline AC Dep Arr Dur OTP Sched  
✈ Nonstop

No flights match your filters.

No scheduled airline flights on this route — it's flown by charter / private operators (). No nonstop flights on this route. connecting options below.

Last scheduled nonstop: Apr 2026.

✦ 1-Stop connections via 10 hubs
MSP Minneapolis 5h 10m AFASDE → DL Minneapolis (MSP) to Cahokia/St Louis flights
PIT Pittsburgh ~6h 36m AS → Pittsburgh (PIT) to Cahokia/St Louis flights
DEN Denver ~6h 45m ASAYCM → SY Denver (DEN) to Cahokia/St Louis flights
SJC San Jose ~6h 53m AMASAY → San Jose (SJC) to Cahokia/St Louis flights
PHX Phoenix ~7h 6m AAAFAS → Phoenix (PHX) to Cahokia/St Louis flights
HOU Houston ~7h 32m WN → Houston (HOU) to Cahokia/St Louis flights
SFO San Francisco ~7h 34m AFAMAS → DL San Francisco (SFO) to Cahokia/St Louis flights
AUS Austin ~7h 41m ASAYDE → Austin (AUS) to Cahokia/St Louis flights
IAH Houston ~8h 1m ASAYBR → UA Houston (IAH) to Cahokia/St Louis flights
LAX Los Angeles ~8h 18m AAAFAM → Los Angeles (LAX) to Cahokia/St Louis flights
✦ 1-STOP More options, longer trips
✧ 2-STOP Loading... Reach the hardest destinations
Seattle to Cahokia/St Louis
Connecting service available through multiple hubs.
1 Airlines 1,722 mi 3h 34m nonstop +2h ahead

SEA–CPS had nonstop service from Sun Country Airlines, last on the schedule in April 2026. There's no nonstop on it right now, so today you'd fly it with one stop. The connecting options below are sorted by layover. Nonstop, it's about 1,722 miles in 3h 34m.

Also explore SEA Routes CPS Routes SEA Live Flights CPS Live Flights SEA Delays
All flights from Cahokia/St Louis (CPS) Cahokia/St Louis to Seattle flights
Carriers on this route

Airline Landscape

Carriers that operated nonstop SEA–CPS service, compared side by side.
Airline Freq/wk Aircraft Duration Dep OTP Alliance Codeshares
SY Sun Country Airlines 0 – – 70% – –
Alliance coverage
Unaffiliated: SY (0 flights/wk, 0%)
OTP based on airport-level delay snapshots. Duration ranges reflect seasonal/directional variation.
Connections

Connection Landscape

1-stop and 2-stop options for SEA to CPS.
1-STOP
One-Stop Connections
14
Hubs
~5h
Fastest
~29h
Longest
MSP ~5h 10m PIT ~6h 36m DEN ~6h 45m SJC ~6h 53m PHX ~7h 6m
Verified with published schedule alignment and minimum connection time.
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.
Reliability

On-Time Performance

What to expect at each end of your journey.
Outbound
SEA → CPS
70%
Moderate delays possible. Allow buffer time.
Departing
70%
Return
CPS → SEA
70%
Moderate delays possible. Allow buffer time.
Arriving
70%
OTP = percentage of flights arriving within 15 min of schedule. Based on airport-level delay snapshots. SEA delays →
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 gate to gate.
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
1-stop connectionsAvailable
Origin: SEA
Full nameSeattle–Tacoma International Airport
IATA / ICAOSEA / KSEA
TimezoneAmerica/Los_Angeles
Passengers/yr50.8M
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 about 3h 34m gate to gate. The route covers 1,722 miles.
1 airline operated the nonstop from SEA to CPS: Sun Country Airlines. The last scheduled nonstop was in April 2026. There's no nonstop right now, so today you'd fly it with one stop. See the connection options above, ranked by layover.
Not right now. The last scheduled nonstop was in April 2026. You can still fly it with one stop, and the connecting options above are sorted by layover. Nonstop, the hop took about 3h 34m.
Yes, 1-stop connections are available, ranked by layover time. Common connecting points include Minneapolis–Saint Paul.
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) had nonstop service from Sun Country Airlines, last on the schedule in April 2026. The nonstop is dormant right now, so the way to fly it today is one connection, and the options above are sorted by layover.

SEA to CPS Flight Duration and Schedule

Nonstop flight time from SEA to CPS is about 3 hours 34 minutes gate to gate. The route covers a distance of 1,722 miles (2,771 km).

Connecting Options and Alternatives

1-stop connecting options are also available, commonly via Minneapolis–Saint Paul.