Seattle to Saint Louis (STL): September 2026 flight deals
Compare trip dates and fares.
Round-trip fare examples
Observed September 16, 2026 (UTC). Search a trip for current prices and flight details.
Round-trip totals in USD for 1 adult · Economy.
| Destination | Trip dates | Days | Axel Member | Airline fare | Stops | Search |
|---|---|---|---|---|---|---|
| Saint Louis (STL) | Sep 21–23, 2026 | 2 | $381 | $428 | 1 stop | Search for 1 adult · Dates · Travelers |
| Saint Louis (STL) | Sep 24–27, 2026 | 3 | $406 | $451 | 1 stop | Search for 1 adult · Dates · Travelers |
| Saint Louis (STL) | Sep 25–27, 2026 | 2 | $406 | $451 | 1 stop | Search for 1 adult · Dates · Travelers |
| Saint Louis (STL) | Sep 25–28, 2026 | 3 | $406 | $451 | 1 stop | Search for 1 adult · Dates · Travelers |
| Saint Louis (STL) | Sep 28–30, 2026 | 2 | $380 | $426 | 1 stop | Search for 1 adult · Dates · Travelers |
| Saint Louis (STL) | Sep 29–30, 2026 | 1 | $357 | $398 | 1 stop | Search for 1 adult · Dates · Travelers |
Compare trip dates
Observed September 17, 2026 (UTC). Check current prices.
USD for the listed travelers.
1 adult · Complete round-trip totals · 2–4 days
Complete round-trip totals; both flights included.
| Trip / travelers | Dates | Flights | Axel Member | Airline fare | Next step |
|---|---|---|---|---|---|
| SEA–STL · 1 adult | Sep 24–27, 2026 · 3 days | Out: American Airlines · 1 stop (ORD) · 6h 46m; Return: American Airlines · 1 stop (ORD) · 7h 9m | $406 | $451 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–STL · 1 adult | Sep 24–27, 2026 · 3 days | Out: American Airlines · 1 stop (ORD) · 6h 46m; Return: Alaska Airlines · Nonstop · 4h 22m | $762 | $850 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–STL · 1 adult | Sep 25–27, 2026 · 2 days | Out: American Airlines · 1 stop (ORD) · 6h 46m; Return: American Airlines · 1 stop (ORD) · 7h 9m | $406 | $451 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–STL · 1 adult | Sep 25–27, 2026 · 2 days | Out: American Airlines · 1 stop (ORD) · 6h 46m; Return: Alaska Airlines · Nonstop · 4h 22m | $762 | $850 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–STL · 1 adult | Sep 28–30, 2026 · 2 days | Out: Frontier Airlines · 1 stop (LAS) · 11h 47m; Return: Frontier Airlines · 1 stop (DEN) · 20h 58m | $380 | $426 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
1 adult · Round-trip starting totals · 2–4 days
Starting totals are for the round trip. Choose a return flight to confirm the final total.
| Trip / travelers | Dates | Flights | Axel Member | Airline fare | Next step |
|---|---|---|---|---|---|
| SEA–STL · 1 adult | Sep 24–27, 2026 · 3 days | Out: Alaska Airlines · Nonstop · 3h 56m | Round-trip starting total: $614 | Round-trip starting total: $685 — return selection pending | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–STL · 1 adult | Sep 25–27, 2026 · 2 days | Out: Alaska Airlines · Nonstop · 3h 56m | Round-trip starting total: $614 | Round-trip starting total: $685 — return selection pending | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–STL · 1 adult | Sep 28–30, 2026 · 2 days | Out: Alaska Airlines · Nonstop · 3h 56m | Round-trip starting total: $605 | Round-trip starting total: $677 — return selection pending | Search for 1 adult · Change dates · Travelers / cabin |
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More flight comparisons from Seattle
- Seattle to Saint Louis (STL) flight deals
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- Seattle to Saint Louis (STL): flights September 21–23, 2026
- Seattle to Saint Louis (STL): flights September 24–27, 2026
- Seattle to Saint Louis (STL): flights September 25–27, 2026
- Seattle to Saint Louis (STL): flights September 25–28, 2026
- Seattle to Saint Louis (STL): flights September 28–30, 2026
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