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 quarters on this route
| Quarter | Passengers/day | Avg. fare | Largest carrier | Largest share | Lowest-fare carrier |
|---|---|---|---|---|---|
| 2024 Q1 | 358 | $232 | Alaska | 64% | Alaska |
| 2024 Q2 | 691 | $272 | Alaska | 68% | Alaska |
| 2024 Q3 | 765 | $268 | Alaska | 64% | Alaska |
| 2024 Q4 | 503 | $265 | Alaska | 70% | Southwest |
| 2025 Q1 | 313 | $254 | Alaska | 67% | American |
| 2025 Q2 | 637 | $267 | Alaska | 69% | Alaska |
| 2025 Q3 | 722 | $258 | Alaska | 66% | Alaska |
| 2025 Q4 | 457 | $259 | Alaska | 73% | Southwest |
| 2026 Q1 | 353 | $252 | Alaska | 71% | Southwest |