Routes/Seattle, WA to St. Louis, MO

Seattle, WA to St. Louis, MO

Average one-way fare in 2026 Q1: $252 · 1709 nonstop miles · 353 passengers per day.

2026 Q1 fare$252
2025 Q1 fare$254
Change−$3
Passengers/day353
Distance1709 mi

The average fare a year earlier (2025 Q1) was $254. The change is $3 lower (1.1%).

The largest carrier on this route in 2026 Q1 was Alaska with 71% of passengers. The lowest-fare carrier was Southwest with 10% of passengers, at an average fare of $237.

All routes from Seattle, WA · All routes from St. Louis, MO

All quarters on this route

QuarterPassengers/dayAvg. fareLargest carrierLargest shareLowest-fare carrier
2024 Q1358$232Alaska64%Alaska
2024 Q2691$272Alaska68%Alaska
2024 Q3765$268Alaska64%Alaska
2024 Q4503$265Alaska70%Southwest
2025 Q1313$254Alaska67%American
2025 Q2637$267Alaska69%Alaska
2025 Q3722$258Alaska66%Alaska
2025 Q4457$259Alaska73%Southwest
2026 Q1353$252Alaska71%Southwest

Source: U.S. Department of Transportation, Consumer Airfare Report Table 1, 2026 Q1. Figures are average one-way fares paid, including taxes and fees, for the quarter shown. Record: city markets 30559 and 31123; U.S. Department of Transportation, Domestic Airline Consumer Airfare Report, Table 1: top 1,000 contiguous-state city-pair markets (average one-way fare, passengers per day, largest carrier, lowest-fare carrier). Fetched 2026-09-27T00:40:04Z. Source data.