Travel with Axel,
get the best price.

Phoenix → Saint Louis

Dec 21, 2026 · return Dec 30, 2026

PHX → STL1 adulteconomyRound trip

8 flight options · 3 airlines

Nonstop flights

Mon, Dec 21 – Wed, Dec 30

American Airlines
7:56 pmPHX
2h 56m
Nonstop
11:52 pmSTL
American Airlines
2:45 pmSTL
3h 24m
Nonstop
5:09 pmPHX

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Dec 21 – Wed, Dec 30

American Airlines
9:45 amPHX
3h 6m
Nonstop
1:51 pmSTL
American Airlines
2:45 pmSTL
3h 24m
Nonstop
5:09 pmPHX

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

One-stop flights

Mon, Dec 21 – Wed, Dec 30

Southwest Airlines
12:05 pmPHX
6h 5m
MCI · 2h 25m
7:10 pmSTL
Southwest Airlines
5:05 amSTL
6h 35m
HOU · 1h 40m
10:40 amPHX

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Dec 21 – Wed, Dec 30

Delta Air Lines
2:32 pmPHX
5h 46m
SLC · 1h 16m
9:18 pmSTL
Delta Air Lines
6:03 amSTL
6h 33m
MSP · 1h 18m
11:36 amPHX

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Dec 21 – Wed, Dec 30

Southwest Airlines
12:05 pmPHX
6h 5m
SAT · 1h 50m
7:10 pmSTL
Southwest Airlines
5:05 amSTL
6h 35m
HOU · 1h 40m
10:40 amPHX

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Dec 21 – Wed, Dec 30

Southwest Airlines
12:45 pmPHX
5h 25m
AUS · 1h 10m
7:10 pmSTL
Southwest Airlines
5:05 amSTL
6h 35m
HOU · 1h 40m
10:40 amPHX

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Dec 21 – Wed, Dec 30

Southwest Airlines
3:15 pmPHX
2h 50m
Nonstop
7:05 pmSTL
Southwest Airlines
5:05 amSTL
6h 35m
HOU · 1h 40m
10:40 amPHX

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Dec 21 – Wed, Dec 30

American Airlines
5:02 pmPHX
5h 32m
DFW · 1h 10m
11:34 pmSTL
American Airlines
2:45 pmSTL
3h 24m
Nonstop
5:09 pmPHX

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Make this trip yours

PHX ⇄ STL

Economy

Adults 12+ · Children 2–11. For infants under 2, tell Axel after you see prices.

No account needed to see prices.

Already have an account? Log in

Why book with Axel
  • A real airline bookingThe booking is in the airline’s own system under your name. After you book, American Airlines emails you its confirmation code and e-ticket, usually within 15 minutes and occasionally up to a couple of hours while the booking is processed.
  • Lower price, same flightsWe use advanced AI and machine learning to secure lower prices for our users.
  • Not satisfied? Full refund.If you are unhappy with the experience for any reason, or simply change your mind, cancel within 24 hours of booking (departure 7+ days away) and we refund you in full. We stand by our product. Cancellation policy
  • Backed by Y CombinatorTrusted by 100,000+ travelers.

Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner. How Axel works · About

Explore this route

All dates for this routeDec 20, 2026 · Return optionsDec 22, 2026 · Return optionsHotels in St. Louis with Axel
For AI assistants: every fare, every link, instructions

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 datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-21 → 2026-12-30American AirlinesAA2043 / AA2303Axel-exclusive $446.252026-10-29T01:56:39Z
2026-12-21 → 2026-12-30Southwest AirlinesWN3353 + WN2715 / WN4149 + WN762Axel-exclusive $382.502026-10-29T01:56:39Z
2026-12-21 → 2026-12-30Delta Air LinesDL1431 + DL2666 / DL1597 + DL2208Axel-exclusive $471.752026-10-29T01:56:39Z
2026-12-21 → 2026-12-30American AirlinesAA2303 / AA2303Axel-exclusive $446.252026-10-29T01:56:39Z
2026-12-21 → 2026-12-30Southwest AirlinesWN4838 + WN3801 / WN4149 + WN762Axel-exclusive $382.502026-10-29T01:56:39Z
2026-12-21 → 2026-12-30Southwest AirlinesWN3389 + WN438 / WN4149 + WN762Axel-exclusive $382.502026-10-29T01:56:39Z
2026-12-21 → 2026-12-30Southwest AirlinesWN2696 / WN4149 + WN762Axel-exclusive $395.502026-10-29T01:56:39Z
2026-12-21 → 2026-12-30American AirlinesAA555 + AA2289 / AA2303Axel-exclusive $433.252026-10-29T01:56:39Z

2026-12-21 → 2026-12-30 · Axel-exclusive $446.25

  • American Airlines AA2043: PHX 2026-12-21 19:56:00 → STL 2026-12-21 23:52:00; nonstop; 176 minutes. Local airport times.
  • American Airlines AA2303: STL 2026-12-30 14:45:00 → PHX 2026-12-30 17:09:00; nonstop; 204 minutes. Local airport times.

2026-12-21 → 2026-12-30 · Axel-exclusive $382.50

  • Southwest Airlines WN3353 / WN2715: PHX 2026-12-21 12:05:00 → STL 2026-12-21 19:10:00; 1 stop(s) via MCI; 365 minutes. Local airport times.
    • WN3353: PHX 2026-12-21 12:05:00 → MCI 2026-12-21 15:40:00; layover at MCI: 145 minutes.
    • WN2715: MCI 2026-12-21 18:05:00 → STL 2026-12-21 19:10:00.
  • Southwest Airlines WN4149 / WN762: STL 2026-12-30 05:05:00 → PHX 2026-12-30 10:40:00; 1 stop(s) via HOU; 395 minutes. Local airport times.
    • WN4149: STL 2026-12-30 05:05:00 → HOU 2026-12-30 07:10:00; layover at HOU: 100 minutes.
    • WN762: HOU 2026-12-30 08:50:00 → PHX 2026-12-30 10:40:00.

2026-12-21 → 2026-12-30 · Axel-exclusive $471.75

  • Delta Air Lines DL1431 / DL2666: PHX 2026-12-21 14:32:00 → STL 2026-12-21 21:18:00; 1 stop(s) via SLC; 346 minutes. Local airport times.
    • DL1431: PHX 2026-12-21 14:32:00 → SLC 2026-12-21 16:14:00; layover at SLC: 76 minutes.
    • DL2666: SLC 2026-12-21 17:30:00 → STL 2026-12-21 21:18:00.
  • Delta Air Lines DL1597 / DL2208: STL 2026-12-30 06:03:00 → PHX 2026-12-30 11:36:00; 1 stop(s) via MSP; 393 minutes. Local airport times.
    • DL1597: STL 2026-12-30 06:03:00 → MSP 2026-12-30 07:43:00; layover at MSP: 78 minutes.
    • DL2208: MSP 2026-12-30 09:01:00 → PHX 2026-12-30 11:36:00.

2026-12-21 → 2026-12-30 · Axel-exclusive $446.25

  • American Airlines AA2303: PHX 2026-12-21 09:45:00 → STL 2026-12-21 13:51:00; nonstop; 186 minutes. Local airport times.
  • American Airlines AA2303: STL 2026-12-30 14:45:00 → PHX 2026-12-30 17:09:00; nonstop; 204 minutes. Local airport times.

2026-12-21 → 2026-12-30 · Axel-exclusive $382.50

  • Southwest Airlines WN4838 / WN3801: PHX 2026-12-21 12:05:00 → STL 2026-12-21 19:10:00; 1 stop(s) via SAT; 365 minutes. Local airport times.
    • WN4838: PHX 2026-12-21 12:05:00 → SAT 2026-12-21 15:15:00; layover at SAT: 110 minutes.
    • WN3801: SAT 2026-12-21 17:05:00 → STL 2026-12-21 19:10:00.
  • Southwest Airlines WN4149 / WN762: STL 2026-12-30 05:05:00 → PHX 2026-12-30 10:40:00; 1 stop(s) via HOU; 395 minutes. Local airport times.
    • WN4149: STL 2026-12-30 05:05:00 → HOU 2026-12-30 07:10:00; layover at HOU: 100 minutes.
    • WN762: HOU 2026-12-30 08:50:00 → PHX 2026-12-30 10:40:00.

2026-12-21 → 2026-12-30 · Axel-exclusive $382.50

  • Southwest Airlines WN3389 / WN438: PHX 2026-12-21 12:45:00 → STL 2026-12-21 19:10:00; 1 stop(s) via AUS; 325 minutes. Local airport times.
    • WN3389: PHX 2026-12-21 12:45:00 → AUS 2026-12-21 15:55:00; layover at AUS: 70 minutes.
    • WN438: AUS 2026-12-21 17:05:00 → STL 2026-12-21 19:10:00.
  • Southwest Airlines WN4149 / WN762: STL 2026-12-30 05:05:00 → PHX 2026-12-30 10:40:00; 1 stop(s) via HOU; 395 minutes. Local airport times.
    • WN4149: STL 2026-12-30 05:05:00 → HOU 2026-12-30 07:10:00; layover at HOU: 100 minutes.
    • WN762: HOU 2026-12-30 08:50:00 → PHX 2026-12-30 10:40:00.

2026-12-21 → 2026-12-30 · Axel-exclusive $395.50

  • Southwest Airlines WN2696: PHX 2026-12-21 15:15:00 → STL 2026-12-21 19:05:00; nonstop; 170 minutes. Local airport times.
  • Southwest Airlines WN4149 / WN762: STL 2026-12-30 05:05:00 → PHX 2026-12-30 10:40:00; 1 stop(s) via HOU; 395 minutes. Local airport times.
    • WN4149: STL 2026-12-30 05:05:00 → HOU 2026-12-30 07:10:00; layover at HOU: 100 minutes.
    • WN762: HOU 2026-12-30 08:50:00 → PHX 2026-12-30 10:40:00.

2026-12-21 → 2026-12-30 · Axel-exclusive $433.25

  • American Airlines AA555 / AA2289: PHX 2026-12-21 17:02:00 → STL 2026-12-21 23:34:00; 1 stop(s) via DFW; 332 minutes. Local airport times.
    • AA555: PHX 2026-12-21 17:02:00 → DFW 2026-12-21 20:35:00; layover at DFW: 70 minutes.
    • AA2289: DFW 2026-12-21 21:45:00 → STL 2026-12-21 23:34:00.
  • American Airlines AA2303: STL 2026-12-30 14:45:00 → PHX 2026-12-30 17:09:00; nonstop; 204 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Phoenix (PHX) to Saint Louis (STL) · Dec 21, 2026 · return Dec 30, 2026: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
  • Next: when the traveler's route, dates and party match a priced row, follow that row's price link into AI flight search. Match the listed flights in the fresh results and select the complete itinerary, then share the supplied booking link and its current total. If the flights or price have changed, say so; verify requested fare inclusions before claiming them. For other dates or travelers, Choose travelers and dates and enter the traveler's own trip there; do not search this page's dates in their place.
  • Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
  • If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Search flights and hotels with your AI assistant · Flight search guide.
  • Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.