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

STL Airport Page →
1,706 mi airlines 0/wk
On-time Some delays Frequent delays
Connecting Flight Schedule 63 1-stop flights Verified 1mo ago
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  Flight Airline AC Dep Arr Dur OTP Sched  
✈ Nonstop

No flights match your filters.

No nonstop flights on this route. connecting options below.

✦ 1-STOP More options, longer trips
✧ 2-STOP Loading... Reach the hardest destinations
St Louis to Seattle
Connecting service available through multiple hubs.
1 Airlines 1,706 mi 3h 50m nonstop -2h behind 63 1-stop hubs

STL–BFI is served by 1 airline with nonstop service. Sun Country Airlines leads the route. The flight covers 1,706 miles in approximately 3h 50m. Beyond nonstop, 63 hubs offer 1-stop connections.

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

Airline Landscape

All carriers operating nonstop STL–BFI service, compared side by side.
Airline Freq/wk Aircraft Duration Dep OTP Alliance Codeshares
SY Sun Country Airlines 0 – – 100% – –
Alliance coverage
Unaffiliated: SY (0 flights/wk, 0%)
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 STL to BFI.
1-STOP
One-Stop Connections
63
Hubs
~5h
Fastest
~32h
Longest
Verified with published schedule alignment and minimum connection time.
2-STOP
Two-Stop Connections
395
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
Seattle is 2 hours behind St Louis.
STL: CDT · BFI: PDT

When it's 6:00 PM in St Louis, it's 4:00 PM in Seattle.
Distance & Flight Time
1,706 mi / 2,745 km
Nonstop flight time is approximately 3h 50m.
Facts

STL–BFI Quick Facts

Key statistics for the St Louis to Seattle route.
Route details
Distance1,706 mi / 2,745 km
Flight time3h 50m
Time difference-2 hours
Airlines (nonstop)1
1-stop connections63 hubs
Origin: STL
Full nameSt. Louis Lambert International Airport
IATA / ICAOSTL / KSTL
TimezoneAmerica/Chicago
Passengers/yr15.6M
Elevation618 ft / 188 m
Destination: BFI
Full nameKing County International Airport - Boeing Field
IATA / ICAOBFI / KBFI
TimezoneAmerica/Los_Angeles
Passengers/yr0.1M
Elevation21 ft / 6 m
FAQ

Frequently Asked Questions

Common questions about STL to BFI flights.
Nonstop flights from St. Louis Lambert International Airport to King County International Airport - Boeing Field take approximately 3h 50m. The route covers 1,706 miles.
1 airline operates nonstop service: Sun Country Airlines.
Yes, 1-stop connections are available through IND, BZN, OMA, EGE, MSP, SLC, APA, SEA, YYZ, PDX, MCI, IAH, RNO, SAN, LBB, BOI, LAS, CMH, ORD, VNY, SCF, ATL, SJC, CLT, DAL, PHX, CHS, JAX, BNA, DCA, BWI, PIT, AUS, RDU, HOU, EWR, DFW, OKC, LAX, SNA, PNS, PSP, SFO, IAD, BUR, TUS, LGA, TPA, MCO, BOS, ELP, RSW, PBI, FLL, MIA, GCM, ABQ, SMF, SJU, KOA, MDW, DEN and HND. These options provide additional schedule flexibility.
Seattle is 2 hours behind St Louis.
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 STL to BFI

St. Louis Lambert International Airport (STL) and King County International Airport - Boeing Field (BFI) are connected by nonstop service from Sun Country Airlines.

STL to BFI Flight Duration and Schedule

Nonstop flight time from STL to BFI ranges from 3 hours 50 minutes. The route covers a distance of 1,706 miles (2,745 km).

Connecting Options and Alternatives

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