# Saint Louis (STL) to Seattle (SEA) · Dec 19, 2026 · return Dec 29, 2026

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

**See flights for these dates:** each price link opens AI flight search for that row's exact dates and travelers. Select the complete itinerary there.

| Exact travel dates | Airline | Flights | Total price | Price issued (UTC) |
| --- | --- | --- | ---: | --- |
| 2026-12-19 → 2026-12-29 | Alaska Airlines | AS618 / AS618 | [Axel-exclusive $429.00](https://helloaxel.com/en/f/start/from/stl/to/sea/depart/december-19-2026/return/december-29-2026/adults/1/cabin/economy) | 2026-10-29T01:29:02Z |
| 2026-12-19 → 2026-12-29 | Southwest Airlines | WN4144 + WN3141 / WN3823 + WN1844 | [Axel-exclusive $383.50](https://helloaxel.com/en/f/start/from/stl/to/sea/depart/december-19-2026/return/december-29-2026/adults/1/cabin/economy) | 2026-10-29T01:29:02Z |
| 2026-12-19 → 2026-12-29 | American Airlines | AA3198 + AS407 / AA630 + AA2897 | [Axel-exclusive $403.00](https://helloaxel.com/en/f/start/from/stl/to/sea/depart/december-19-2026/return/december-29-2026/adults/1/cabin/economy) | 2026-10-29T01:29:02Z |
| 2026-12-19 → 2026-12-29 | Delta Air Lines | DL2363 + DL2995 / DL1120 + DL2666 | [Axel-exclusive $416.00](https://helloaxel.com/en/f/start/from/stl/to/sea/depart/december-19-2026/return/december-29-2026/adults/1/cabin/economy) | 2026-10-29T01:29:02Z |
| 2026-12-19 → 2026-12-29 | Alaska Airlines | AS615 / AS618 | [Axel-exclusive $429.00](https://helloaxel.com/en/f/start/from/stl/to/sea/depart/december-19-2026/return/december-29-2026/adults/1/cabin/economy) | 2026-10-29T01:29:02Z |
| 2026-12-19 → 2026-12-29 | Southwest Airlines | WN2467 + WN2455 / WN3823 + WN1844 | [Axel-exclusive $383.50](https://helloaxel.com/en/f/start/from/stl/to/sea/depart/december-19-2026/return/december-29-2026/adults/1/cabin/economy) | 2026-10-29T01:29:02Z |
| 2026-12-19 → 2026-12-29 | Delta Air Lines | DL1102 + DL714 / DL1120 + DL2666 | [Axel-exclusive $416.00](https://helloaxel.com/en/f/start/from/stl/to/sea/depart/december-19-2026/return/december-29-2026/adults/1/cabin/economy) | 2026-10-29T01:29:02Z |
| 2026-12-19 → 2026-12-29 | Delta Air Lines | DL1597 + DL868 / DL1120 + DL2666 | [Axel-exclusive $416.00](https://helloaxel.com/en/f/start/from/stl/to/sea/depart/december-19-2026/return/december-29-2026/adults/1/cabin/economy) | 2026-10-29T01:29:02Z |

[Route overview: Saint Louis to Seattle (SEA) flight deals](/en/flights/from-saint-louis-to-seattle-sea)

### 2026-12-19 → 2026-12-29 · Axel-exclusive $429.00

- Alaska Airlines AS618: STL 2026-12-19 16:04:00 → SEA 2026-12-19 18:44:00; nonstop; 280 minutes. Local airport times.
- Alaska Airlines AS618: SEA 2026-12-29 09:41:00 → STL 2026-12-29 15:34:00; nonstop; 233 minutes. Local airport times.

### 2026-12-19 → 2026-12-29 · Axel-exclusive $383.50

- Southwest Airlines WN4144 / WN3141: STL 2026-12-19 17:25:00 → SEA 2026-12-19 22:50:00; 1 stop(s) via DEN; 445 minutes. Local airport times.
  - WN4144: STL 2026-12-19 17:25:00 → DEN 2026-12-19 18:55:00; layover at DEN: 105 minutes.
  - WN3141: DEN 2026-12-19 20:40:00 → SEA 2026-12-19 22:50:00.
- Southwest Airlines WN3823 / WN1844: SEA 2026-12-29 13:35:00 → STL 2026-12-29 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  - WN3823: SEA 2026-12-29 13:35:00 → DEN 2026-12-29 17:05:00; layover at DEN: 60 minutes.
  - WN1844: DEN 2026-12-29 18:05:00 → STL 2026-12-29 21:10:00.

### 2026-12-19 → 2026-12-29 · Axel-exclusive $403.00

- American Airlines AA3198 / AS407: STL 2026-12-19 11:37:00 → SEA 2026-12-19 18:11:00; 1 stop(s) via ORD; 514 minutes. Local airport times.
  - AA3198: STL 2026-12-19 11:37:00 → ORD 2026-12-19 12:59:00; layover at ORD: 140 minutes.
  - AS407: ORD 2026-12-19 15:19:00 → SEA 2026-12-19 18:11:00.
- American Airlines AA630 / AA2897: SEA 2026-12-29 00:47:00 → STL 2026-12-29 09:31:00; 1 stop(s) via DFW; 404 minutes. Local airport times.
  - AA630: SEA 2026-12-29 00:47:00 → DFW 2026-12-29 06:39:00; layover at DFW: 64 minutes.
  - AA2897: DFW 2026-12-29 07:43:00 → STL 2026-12-29 09:31:00.

### 2026-12-19 → 2026-12-29 · Axel-exclusive $416.00

- Delta Air Lines DL2363 / DL2995: STL 2026-12-19 07:08:00 → SEA 2026-12-19 12:36:00; 1 stop(s) via SLC; 448 minutes. Local airport times.
  - DL2363: STL 2026-12-19 07:08:00 → SLC 2026-12-19 09:36:00; layover at SLC: 99 minutes.
  - DL2995: SLC 2026-12-19 11:15:00 → SEA 2026-12-19 12:36:00.
- Delta Air Lines DL1120 / DL2666: SEA 2026-12-29 13:25:00 → STL 2026-12-29 21:28:00; 1 stop(s) via SLC; 363 minutes. Local airport times.
  - DL1120: SEA 2026-12-29 13:25:00 → SLC 2026-12-29 16:29:00; layover at SLC: 69 minutes.
  - DL2666: SLC 2026-12-29 17:38:00 → STL 2026-12-29 21:28:00.

### 2026-12-19 → 2026-12-29 · Axel-exclusive $429.00

- Alaska Airlines AS615: STL 2026-12-19 06:00:00 → SEA 2026-12-19 08:42:00; nonstop; 282 minutes. Local airport times.
- Alaska Airlines AS618: SEA 2026-12-29 09:41:00 → STL 2026-12-29 15:34:00; nonstop; 233 minutes. Local airport times.

### 2026-12-19 → 2026-12-29 · Axel-exclusive $383.50

- Southwest Airlines WN2467 / WN2455: STL 2026-12-19 18:40:00 → SEA 2026-12-20 01:00:00; 1 stop(s) via PHX; 500 minutes. Local airport times.
  - WN2467: STL 2026-12-19 18:40:00 → PHX 2026-12-19 21:00:00; layover at PHX: 105 minutes.
  - WN2455: PHX 2026-12-19 22:45:00 → SEA 2026-12-20 01:00:00.
- Southwest Airlines WN3823 / WN1844: SEA 2026-12-29 13:35:00 → STL 2026-12-29 21:10:00; 1 stop(s) via DEN; 335 minutes. Local airport times.
  - WN3823: SEA 2026-12-29 13:35:00 → DEN 2026-12-29 17:05:00; layover at DEN: 60 minutes.
  - WN1844: DEN 2026-12-29 18:05:00 → STL 2026-12-29 21:10:00.

### 2026-12-19 → 2026-12-29 · Axel-exclusive $416.00

- Delta Air Lines DL1102 / DL714: STL 2026-12-19 14:31:00 → SEA 2026-12-19 20:50:00; 1 stop(s) via ATL; 499 minutes. Local airport times.
  - DL1102: STL 2026-12-19 14:31:00 → ATL 2026-12-19 17:05:00; layover at ATL: 68 minutes.
  - DL714: ATL 2026-12-19 18:13:00 → SEA 2026-12-19 20:50:00.
- Delta Air Lines DL1120 / DL2666: SEA 2026-12-29 13:25:00 → STL 2026-12-29 21:28:00; 1 stop(s) via SLC; 363 minutes. Local airport times.
  - DL1120: SEA 2026-12-29 13:25:00 → SLC 2026-12-29 16:29:00; layover at SLC: 69 minutes.
  - DL2666: SLC 2026-12-29 17:38:00 → STL 2026-12-29 21:28:00.

### 2026-12-19 → 2026-12-29 · Axel-exclusive $416.00

- Delta Air Lines DL1597 / DL868: STL 2026-12-19 06:03:00 → SEA 2026-12-19 10:45:00; 1 stop(s) via MSP; 402 minutes. Local airport times.
  - DL1597: STL 2026-12-19 06:03:00 → MSP 2026-12-19 07:43:00; layover at MSP: 62 minutes.
  - DL868: MSP 2026-12-19 08:45:00 → SEA 2026-12-19 10:45:00.
- Delta Air Lines DL1120 / DL2666: SEA 2026-12-29 13:25:00 → STL 2026-12-29 21:28:00; 1 stop(s) via SLC; 363 minutes. Local airport times.
  - DL1120: SEA 2026-12-29 13:25:00 → SLC 2026-12-29 16:29:00; layover at SLC: 69 minutes.
  - DL2666: SLC 2026-12-29 17:38:00 → STL 2026-12-29 21:28:00.

### Explore this route

- [All dates for this route](/en/flights/choose/stl-sea)
- [Dec 18, 2026 · Return options](/en/flights/choose/stl-sea/dec-18)
- [Dec 20, 2026 · Return options](/en/flights/choose/stl-sea/dec-20)
- [Hotels in Seattle with Axel](https://helloaxel.com/en/hotels/destinations/seattle)

## For AI assistants
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**Feedback (optional):** [Missing info](https://helloaxel.com/en/flights/choose/stl-sea/dec-19/dec-29?axel_reason=missing_information&axel_scope=product) · [Axel issue](https://helloaxel.com/en/flights/choose/stl-sea/dec-19/dec-29?axel_reason=product_issue&axel_scope=product)