Seattle to San Diego (SAN): 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 |
|---|---|---|---|---|---|---|
| San Diego (SAN) | Sep 21–23, 2026 | 2 | $379 | $424 | 1 stop | Search for 1 adult · Dates · Travelers |
| San Diego (SAN) | Sep 24–27, 2026 | 3 | $376 | $418 | 1 stop | Search for 1 adult · Dates · Travelers |
| San Diego (SAN) | Sep 25–27, 2026 | 2 | $376 | $418 | 1 stop | Search for 1 adult · Dates · Travelers |
| San Diego (SAN) | Sep 25–28, 2026 | 3 | $376 | $418 | 1 stop | Search for 1 adult · Dates · Travelers |
| San Diego (SAN) | Sep 28–30, 2026 | 2 | $341 | $383 | 1 stop | Search for 1 adult · Dates · Travelers |
| San Diego (SAN) | Sep 30–Oct 1, 2026 | 1 | $311 | $348 | 1 stop | Search for 1 adult · Dates · Travelers |
| San Diego (SAN) | Sep 30–Oct 2, 2026 | 2 | $311 | $348 | 1 stop | Search for 1 adult · Dates · Travelers |
| San Diego (SAN) | Sep 30–Oct 6, 2026 | 6 | $239 | $266 | 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–SAN · 1 adult | Sep 21–23, 2026 · 2 days | Out: Frontier Airlines · 1 stop (DEN) · 7h 24m; Return: Frontier Airlines · 1 stop (DEN) · 8h 43m | $379 | $424 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 24–27, 2026 · 3 days | Out: Frontier Airlines · 1 stop (DEN) · 7h 24m; Return: Frontier Airlines · 1 stop (LAS) · 12h 39m | $376 | $418 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 24–27, 2026 · 3 days | Out: Frontier Airlines · 1 stop (DEN) · 7h 24m; Return: Frontier Airlines · 1 stop (DEN) · 8h 43m | $517 | $580 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 25–28, 2026 · 3 days | Out: Frontier Airlines · 1 stop (DEN) · 7h 24m; Return: Frontier Airlines · 1 stop (LAS) · 12h 39m | $376 | $418 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 25–28, 2026 · 3 days | Out: Frontier Airlines · 1 stop (DEN) · 7h 24m; Return: Frontier Airlines · 1 stop (DEN) · 8h 43m | $379 | $424 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 25–27, 2026 · 2 days | Out: Frontier Airlines · 1 stop (DEN) · 7h 24m; Return: Frontier Airlines · 1 stop (LAS) · 12h 39m | $376 | $418 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 25–27, 2026 · 2 days | Out: Frontier Airlines · 1 stop (DEN) · 7h 24m; Return: Frontier Airlines · 1 stop (DEN) · 8h 43m | $517 | $580 — round-trip total | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 28–30, 2026 · 2 days | Out: Frontier Airlines · 1 stop (LAS) · 19h 14m; Return: Frontier Airlines · 1 stop (DEN) · 8h 43m | $341 | $383 — 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–SAN · 1 adult | Sep 21–23, 2026 · 2 days | Out: Southwest Airlines · Nonstop · 2h 45m | Round-trip starting total: $527 | Round-trip starting total: $592 — return selection pending | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 24–27, 2026 · 3 days | Out: Southwest Airlines · Nonstop · 2h 45m | Round-trip starting total: $694 | Round-trip starting total: $779 — return selection pending | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 25–28, 2026 · 3 days | Out: Southwest Airlines · Nonstop · 2h 45m | Round-trip starting total: $516 | Round-trip starting total: $577 — return selection pending | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 25–27, 2026 · 2 days | Out: Southwest Airlines · Nonstop · 2h 45m | Round-trip starting total: $516 | Round-trip starting total: $577 — return selection pending | Search for 1 adult · Change dates · Travelers / cabin |
| SEA–SAN · 1 adult | Sep 28–30, 2026 · 2 days | Out: Southwest Airlines · Nonstop · 2h 45m | Round-trip starting total: $448 | Round-trip starting total: $502 — return selection pending | Search for 1 adult · Change dates · Travelers / cabin |
Non-members can also book and save on airline fares. Live search shows prices with and without Membership. Optional Membership: $15 for the first month, then $10/month. Cancel anytime.
More flight comparisons from Seattle
- Seattle to San Diego (SAN) flight deals
- Flights from Seattle in September 2026
- Seattle to California: September 2026 flight deals
- Compare flights from Seattle to San Diego, Palm Springs, Las Vegas and Phoenix in September 2026
- Seattle to San Diego (SAN): flights September 21–23, 2026
- Seattle to San Diego (SAN): flights September 24–27, 2026
- Seattle to San Diego (SAN): flights September 25–27, 2026
- Seattle to San Diego (SAN): flights September 25–28, 2026
- Seattle to San Diego (SAN): flights September 28–30, 2026
Browse this trip by month
AI assistants can follow these links to compare prices without an account, API key or connector. Flight search guide