Seattle to St Louis (SEA–STL) — Airlines, Schedules & Connections

SEA Airport Page →
1,705 mi airlines 21/wk
On-time Some delays Frequent delays
Flight Schedule 6 flights Verified 36m ago
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  Flight Airline AC Dep Arr Dur OTP Sched  
✓
→
AS618
AS Alaska
7M9
7:55 AM
MDT
1:51 PM
EDT
3h 56m
—
M T W T F S S
Prices
✓
→
AS388
AS Alaska
73J
8:55 AM
MDT
2:51 PM
EDT
3h 56m
—
M T W T F S S
Prices
✓
→
AS615
AS Alaska
739
6:07 PM
MDT
11:59 PM
EDT
3h 52m
—
M T W T F S S
Prices
✓
←
AS473
AS Alaska
739
7:00 AM
EDT T1
9:42 AM
MDT
4h 42m
—
M T W T F S S
Prices
✓
←
AS314
AS Alaska
7M9
2:44 PM
EDT T1
5:17 PM
MDT
4h 33m
—
M T W T F S S
Prices
✓
←
AS388
AS Alaska
73J
3:50 PM
EDT T1
6:23 PM
MDT
4h 33m
—
M T W T F S S
Prices

No flights match your filters.

No nonstop flights on this route. connecting options below.

✦ 1-STOP
✧ 2-STOP Loading...
Seattle to St Louis
1 carrier, 21 flights/week nonstop.
1 Airlines 21 Flights/wk 1,705 mi 3h 52m nonstop +2h ahead 61 1-stop hubs

SEA–STL is served by 1 airline with nonstop service. Alaska Airlines leads the route. The flight covers 1,705 miles in approximately 3h 52m. Beyond nonstop, 61 hubs offer 1-stop connections.

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

Airline Landscape

All carriers operating nonstop SEA–STL service, compared side by side.
Airline Freq/wk Aircraft Duration Dep OTP Alliance Codeshares
AS Alaska Airlines 21 739, 73J, 7M9 3h52-3h56 94% Oneworld –
Aircraft on this route
739 Boeing 737-900 – AS
73J Boeing 737-900ER – AS
7M9 Boeing 737 MAX 9 – AS
Alliance coverage
Oneworld: AS (21 flights/wk, 100%)
OTP based on airport-level delay snapshots. Duration ranges reflect seasonal/directional variation.
Schedule

Weekly Schedule Pattern

Nonstop flight frequency by day of week, SEA to STL direction.
Mon
3
flights
Tue
3
flights
Wed
3
flights
Thu
3
flights
Fri
3
flights
Sat
3
flights
Sun
3
flights
Departure time distribution
12 AM6 AM12 PM6 PM12 AM
Morning departures
Afternoon/evening departures
3
Nonstop flights
21
Outbound / wk
21
Return / wk
Connections

Connection Landscape

Beyond nonstop. 1-stop and 2-stop options for SEA to STL.
1-STOP
One-Stop Connections
61
Hubs
~4h
Fastest
~40h
Longest
BZN ~4h 42m MKC ~4h 46m JAC ~4h 47m EGE ~5h 16m BUR ~6h 9m
Verified with published schedule alignment and minimum connection time.
2-STOP
Two-Stop Connections
3,007
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.
Reliability

On-Time Performance

What to expect at each end of your journey.
Outbound
SEA → STL
94%
Generally reliable. Most flights run on time.
Departing
94%
Arriving
87%
Return
STL → SEA
73%
Moderate delays possible. Allow buffer time.
Departing
73%
Arriving
100%
OTP = percentage of flights arriving within 15 min of schedule. Based on airport-level delay snapshots. SEA delays → STL delays →
Know before you go

Travel Essentials

Practical planning for this route.
Time Difference
+2h
St Louis is 2 hours ahead of Seattle.
SEA: MDT · STL: EDT

When it's 6:00 PM in Seattle, it's 8:00 PM in St Louis.
Distance & Flight Time
1,705 mi / 2,744 km
Nonstop flight time is approximately 3h 52m to 3h 56m.
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–STL Quick Facts

Key statistics for the Seattle to St Louis route.
Route details
Distance1,705 mi / 2,744 km
Flight time3h 52m to 3h 56m
Time difference+2 hours
Airlines (nonstop)1
Weekly flights21 out / 21 return
1-stop connections61 hubs
Origin: SEA
Full nameSeattle–Tacoma International Airport
IATA / ICAOSEA / KSEA
TimezoneAmerica/Boise
Passengers/yr52.6M
Elevation433 ft / 132 m
Destination: STL
Full nameSt. Louis Lambert International Airport
IATA / ICAOSTL / KSTL
TimezoneAmerica/Indiana/Vincennes
Passengers/yr15.6M
Elevation618 ft / 188 m
FAQ

Frequently Asked Questions

Common questions about SEA to STL flights.
Nonstop flights from Seattle–Tacoma International Airport to St. Louis Lambert International Airport take approximately 3h 52m to 3h 56m. The route covers 1,705 miles.
1 airline operates nonstop service: Alaska Airlines.
There are approximately 21 nonstop flights per week from SEA to STL. The return direction has about 21 weekly flights.
Yes, 1-stop connections are available through BZN, MKC, JAC, EGE, BUR, AFW, ICT, SJC, PSP, OKC, TUL, SBD, MKE, CMH, MDW, MEM, CLT, MCI, ORD, DEN, DFW, PHX, PIT, RDU, SLC, LAX, BNA, DTW, SFO, ATL, BOS, LAS, SMF, MSY, MCO, MSP, IAH, FLL, IAD, EWR, IND, AUS, PHL, SAN, MIA, OMA, BWI, DAL, TPA, RSW, DCA, SAT, SJD, CHS, YYZ, PVR, CUN, CLE, HND, FRA and CVG. These options provide additional schedule flexibility.
St Louis is 2 hours ahead of Seattle.
Yes, return flights from STL 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 STL

Seattle–Tacoma International Airport (SEA) and St. Louis Lambert International Airport (STL) are connected by nonstop service from Alaska Airlines. With 21 weekly departures, this is a well served route.

SEA to STL Flight Duration and Schedule

Nonstop flight time from SEA to STL ranges from 3 hours 52 minutes to 3 hours 56 minutes. The route covers a distance of 1,705 miles (2,744 km). There are approximately 21 weekly flights outbound and 21 return, totaling 42 flights per week in both directions.

Connecting Options and Alternatives

61 one-stop connections are available, with the fastest taking approximately 4 hours via BZN. Two-stop connections are also available via intermediate hubs.