Travel with Axel,
get the best price.

Denver → Saint Louis

Dec 9, 2026 · return Dec 19, 2026

DEN → STL1 adulteconomyRound trip

12 flight options · 4 airlines

Nonstop flights

Wed, Dec 9 – Sat, Dec 19

Frontier Airlines
12:21 pmDEN
2h 2m
Nonstop
3:23 pmSTL
Frontier Airlines
7:59 pmSTL
2h 31m
Nonstop
9:30 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Southwest Airlines
12:25 pmDEN
1h 55m
Nonstop
3:20 pmSTL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

United Airlines
1:55 pmDEN
2h 2m
Nonstop
4:57 pmSTL
United Airlines
4:39 pmSTL
2h 31m
Nonstop
6:10 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Frontier Airlines
8:00 amDEN
2h 4m
Nonstop
11:04 amSTL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Southwest Airlines
6:05 pmDEN
2h 5m
Nonstop
9:10 pmSTL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

United Airlines
9:35 amDEN
2h 3m
Nonstop
12:38 pmSTL
United Airlines
4:39 pmSTL
2h 31m
Nonstop
6:10 pmDEN

Round-trip total · 1 adult · Taxes included

One-stop flights

Wed, Dec 9 – Sat, Dec 19

American Airlines
1:15 pmDEN
5h 21m
DFW · 1h 35m
7:36 pmSTL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Southwest Airlines
11:05 amDEN
4h 40m
MSP · 1h 5m
4:45 pmSTL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Southwest Airlines
10:40 amDEN
5h 20m
MKE · 1h 45m
5:00 pmSTL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Southwest Airlines
6:30 pmDEN
5h 5m
DAL · 1h 20m
12:35 am+1STL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Southwest Airlines
2:00 pmDEN
4h 10m
MCI · 1h 30m
7:10 pmSTL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Wed, Dec 9 – Sat, Dec 19

Southwest Airlines
2:25 pmDEN
5h 20m
BNA · 1h 45m
8:45 pmSTL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Make this trip yours

DEN ⇄ 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, Frontier 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

More dates

All dates for this routeNov 20, 2026 → Nov 23, 2026Nov 27, 2026 → Dec 4, 2026Nov 20, 2026 · One way
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.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-09 → 2026-12-19Frontier AirlinesF93302 / F94567$166.752026-10-29T01:05:09Z
2026-12-09 → 2026-12-19Southwest AirlinesWN1807 / WN1508$310.502026-10-29T01:05:09Z
2026-12-09 → 2026-12-19United AirlinesUA1639 / UA663$322.002026-10-29T01:05:09Z
2026-12-09 → 2026-12-19American Airlines / Southwest AirlinesAA2579 + AA2246 / WN1508$323.002026-10-29T01:05:09Z
2026-12-09 → 2026-12-19Frontier Airlines / Southwest AirlinesF93302 / WN1508$248.002026-10-29T01:05:09Z
2026-12-09 → 2026-12-19Southwest AirlinesWN1844 / WN1508$310.502026-10-29T01:05:09Z
2026-12-09 → 2026-12-19United AirlinesUA652 / UA663$322.002026-10-29T01:05:09Z
2026-12-09 → 2026-12-19Southwest AirlinesWN2832 + WN3131 / WN1508$318.002026-10-29T01:05:09Z
2026-12-09 → 2026-12-19Southwest AirlinesWN1706 + WN3113 / WN1508$318.002026-10-29T01:05:09Z
2026-12-09 → 2026-12-19Southwest AirlinesWN235 + WN4472 / WN1508$318.002026-10-29T01:05:09Z
2026-12-09 → 2026-12-19Southwest AirlinesWN2075 + WN2715 / WN1508$318.002026-10-29T01:05:09Z
2026-12-09 → 2026-12-19Southwest AirlinesWN1573 + WN742 / WN1508$318.002026-10-29T01:05:09Z

2026-12-09 → 2026-12-19 · $166.75

  • Frontier Airlines F93302: DEN 2026-12-09 12:21:00 → STL 2026-12-09 15:23:00; nonstop; 122 minutes. Local airport times.
  • Frontier Airlines F94567: STL 2026-12-19 19:59:00 → DEN 2026-12-19 21:30:00; nonstop; 151 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $310.50

  • Southwest Airlines WN1807: DEN 2026-12-09 12:25:00 → STL 2026-12-09 15:20:00; nonstop; 115 minutes. Local airport times.
  • Southwest Airlines WN1508: STL 2026-12-19 12:55:00 → DEN 2026-12-19 14:15:00; nonstop; 140 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $322.00

  • United Airlines UA1639: DEN 2026-12-09 13:55:00 → STL 2026-12-09 16:57:00; nonstop; 122 minutes. Local airport times.
  • United Airlines UA663: STL 2026-12-19 16:39:00 → DEN 2026-12-19 18:10:00; nonstop; 151 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $323.00

  • American Airlines AA2579 / AA2246: DEN 2026-12-09 13:15:00 → STL 2026-12-09 19:36:00; 1 stop(s) via DFW; 321 minutes. Local airport times.
    • AA2579: DEN 2026-12-09 13:15:00 → DFW 2026-12-09 16:20:00; layover at DFW: 95 minutes.
    • AA2246: DFW 2026-12-09 17:55:00 → STL 2026-12-09 19:36:00.
  • Southwest Airlines WN1508: STL 2026-12-19 12:55:00 → DEN 2026-12-19 14:15:00; nonstop; 140 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $248.00

  • Frontier Airlines F93302: DEN 2026-12-09 08:00:00 → STL 2026-12-09 11:04:00; nonstop; 124 minutes. Local airport times.
  • Southwest Airlines WN1508: STL 2026-12-19 12:55:00 → DEN 2026-12-19 14:15:00; nonstop; 140 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $310.50

  • Southwest Airlines WN1844: DEN 2026-12-09 18:05:00 → STL 2026-12-09 21:10:00; nonstop; 125 minutes. Local airport times.
  • Southwest Airlines WN1508: STL 2026-12-19 12:55:00 → DEN 2026-12-19 14:15:00; nonstop; 140 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $322.00

  • United Airlines UA652: DEN 2026-12-09 09:35:00 → STL 2026-12-09 12:38:00; nonstop; 123 minutes. Local airport times.
  • United Airlines UA663: STL 2026-12-19 16:39:00 → DEN 2026-12-19 18:10:00; nonstop; 151 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $318.00

  • Southwest Airlines WN2832 / WN3131: DEN 2026-12-09 11:05:00 → STL 2026-12-09 16:45:00; 1 stop(s) via MSP; 280 minutes. Local airport times.
    • WN2832: DEN 2026-12-09 11:05:00 → MSP 2026-12-09 14:05:00; layover at MSP: 65 minutes.
    • WN3131: MSP 2026-12-09 15:10:00 → STL 2026-12-09 16:45:00.
  • Southwest Airlines WN1508: STL 2026-12-19 12:55:00 → DEN 2026-12-19 14:15:00; nonstop; 140 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $318.00

  • Southwest Airlines WN1706 / WN3113: DEN 2026-12-09 10:40:00 → STL 2026-12-09 17:00:00; 1 stop(s) via MKE; 320 minutes. Local airport times.
    • WN1706: DEN 2026-12-09 10:40:00 → MKE 2026-12-09 13:55:00; layover at MKE: 105 minutes.
    • WN3113: MKE 2026-12-09 15:40:00 → STL 2026-12-09 17:00:00.
  • Southwest Airlines WN1508: STL 2026-12-19 12:55:00 → DEN 2026-12-19 14:15:00; nonstop; 140 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $318.00

  • Southwest Airlines WN235 / WN4472: DEN 2026-12-09 18:30:00 → STL 2026-12-10 00:35:00; 1 stop(s) via DAL; 305 minutes. Local airport times.
    • WN235: DEN 2026-12-09 18:30:00 → DAL 2026-12-09 21:30:00; layover at DAL: 80 minutes.
    • WN4472: DAL 2026-12-09 22:50:00 → STL 2026-12-10 00:35:00.
  • Southwest Airlines WN1508: STL 2026-12-19 12:55:00 → DEN 2026-12-19 14:15:00; nonstop; 140 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $318.00

  • Southwest Airlines WN2075 / WN2715: DEN 2026-12-09 14:00:00 → STL 2026-12-09 19:10:00; 1 stop(s) via MCI; 250 minutes. Local airport times.
    • WN2075: DEN 2026-12-09 14:00:00 → MCI 2026-12-09 16:35:00; layover at MCI: 90 minutes.
    • WN2715: MCI 2026-12-09 18:05:00 → STL 2026-12-09 19:10:00.
  • Southwest Airlines WN1508: STL 2026-12-19 12:55:00 → DEN 2026-12-19 14:15:00; nonstop; 140 minutes. Local airport times.

2026-12-09 → 2026-12-19 · $318.00

  • Southwest Airlines WN1573 / WN742: DEN 2026-12-09 14:25:00 → STL 2026-12-09 20:45:00; 1 stop(s) via BNA; 320 minutes. Local airport times.
    • WN1573: DEN 2026-12-09 14:25:00 → BNA 2026-12-09 17:45:00; layover at BNA: 105 minutes.
    • WN742: BNA 2026-12-09 19:30:00 → STL 2026-12-09 20:45:00.
  • Southwest Airlines WN1508: STL 2026-12-19 12:55:00 → DEN 2026-12-19 14:15:00; nonstop; 140 minutes. Local airport times.

More dates for this route