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Route overview: Denver to Saint Louis (STL) flight deals

Denver → Saint Louis

Dec 6, 2026 · return Dec 16, 2026

DEN → STL1 adulteconomyRound trip

12 flight options · 4 airlines

Nonstop flights

Sun, Dec 6 – Wed, Dec 16

Frontier Airlines
12:21 pmDEN
2h 2m
Nonstop
3:23 pmSTL
Frontier Airlines
4:18 pmSTL
2h 30m
Nonstop
5:48 pmDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

Southwest Airlines
7:10 pmDEN
2h
Nonstop
10:10 pmSTL
Southwest Airlines
6:30 amSTL
2h 25m
Nonstop
7:55 amDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

United Airlines
1:55 pmDEN
2h 5m
Nonstop
5:00 pmSTL
United Airlines
8:40 amSTL
2h 31m
Nonstop
10:11 amDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

Frontier Airlines
8:00 amDEN
2h 4m
Nonstop
11:04 amSTL
Southwest Airlines
6:30 amSTL
2h 25m
Nonstop
7:55 amDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

Southwest Airlines
10:30 amDEN
2h
Nonstop
1:30 pmSTL
Southwest Airlines
6:30 amSTL
2h 25m
Nonstop
7:55 amDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

United Airlines
9:35 amDEN
2h 3m
Nonstop
12:38 pmSTL
United Airlines
8:40 amSTL
2h 31m
Nonstop
10:11 amDEN

Round-trip total · 1 adult · Taxes included

One-stop flights

Sun, Dec 6 – Wed, Dec 16

American Airlines
1:15 pmDEN
5h 21m
DFW · 1h 35m
7:36 pmSTL
Southwest Airlines
6:30 amSTL
2h 25m
Nonstop
7:55 amDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

Southwest Airlines
6:30 pmDEN
5h 5m
DAL · 1h 20m
12:35 am+1STL
Southwest Airlines
6:30 amSTL
2h 25m
Nonstop
7:55 amDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

Southwest Airlines
2:00 pmDEN
4h 10m
MCI · 1h 30m
7:10 pmSTL
Southwest Airlines
6:30 amSTL
2h 25m
Nonstop
7:55 amDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

Southwest Airlines
10:40 amDEN
5h 20m
MKE · 1h 45m
5:00 pmSTL
Southwest Airlines
6:30 amSTL
2h 25m
Nonstop
7:55 amDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

Southwest Airlines
11:05 amDEN
4h 40m
MSP · 1h 5m
4:45 pmSTL
Southwest Airlines
6:30 amSTL
2h 25m
Nonstop
7:55 amDEN

Round-trip total · 1 adult · Taxes included

Sun, Dec 6 – Wed, Dec 16

Southwest Airlines
2:25 pmDEN
5h 20m
BNA · 1h 45m
8:45 pmSTL
Southwest Airlines
6:30 amSTL
2h 25m
Nonstop
7:55 amDEN

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.

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Explore this route

All dates for this routeDec 5, 2026 → Dec 15, 2026Dec 7, 2026 → Dec 17, 2026
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.

Live price for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the flights there to get the current bookable total; the listed prices are the ones issued at the times shown.

Route overview: Denver to Saint Louis (STL) flight deals

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-06 → 2026-12-16Frontier AirlinesF93302 / F94567$145.002026-10-29T01:05:09Z
2026-12-06 → 2026-12-16Southwest AirlinesWN1844 / WN4140$270.002026-10-29T01:05:09Z
2026-12-06 → 2026-12-16United AirlinesUA1639 / UA1605$280.002026-10-29T01:05:09Z
2026-12-06 → 2026-12-16American Airlines / Southwest AirlinesAA2579 + AA2246 / WN4140$282.502026-10-29T01:05:09Z
2026-12-06 → 2026-12-16Frontier Airlines / Southwest AirlinesF93302 / WN4140$207.502026-10-29T01:05:09Z
2026-12-06 → 2026-12-16Southwest AirlinesWN1807 / WN4140$270.002026-10-29T01:05:09Z
2026-12-06 → 2026-12-16United AirlinesUA652 / UA1605$280.002026-10-29T01:05:09Z
2026-12-06 → 2026-12-16Southwest AirlinesWN235 + WN4472 / WN4140$277.502026-10-29T01:05:09Z
2026-12-06 → 2026-12-16Southwest AirlinesWN2075 + WN2715 / WN4140$277.502026-10-29T01:05:09Z
2026-12-06 → 2026-12-16Southwest AirlinesWN1706 + WN3113 / WN4140$277.502026-10-29T01:05:09Z
2026-12-06 → 2026-12-16Southwest AirlinesWN2832 + WN3131 / WN4140$277.502026-10-29T01:05:09Z
2026-12-06 → 2026-12-16Southwest AirlinesWN1573 + WN742 / WN4140$277.502026-10-29T01:05:09Z

2026-12-06 → 2026-12-16 · $145.00

  • Frontier Airlines F93302: DEN 2026-12-06 12:21:00 → STL 2026-12-06 15:23:00; nonstop; 122 minutes. Local airport times.
  • Frontier Airlines F94567: STL 2026-12-16 16:18:00 → DEN 2026-12-16 17:48:00; nonstop; 150 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $270.00

  • Southwest Airlines WN1844: DEN 2026-12-06 19:10:00 → STL 2026-12-06 22:10:00; nonstop; 120 minutes. Local airport times.
  • Southwest Airlines WN4140: STL 2026-12-16 06:30:00 → DEN 2026-12-16 07:55:00; nonstop; 145 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $280.00

  • United Airlines UA1639: DEN 2026-12-06 13:55:00 → STL 2026-12-06 17:00:00; nonstop; 125 minutes. Local airport times.
  • United Airlines UA1605: STL 2026-12-16 08:40:00 → DEN 2026-12-16 10:11:00; nonstop; 151 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $282.50

  • American Airlines AA2579 / AA2246: DEN 2026-12-06 13:15:00 → STL 2026-12-06 19:36:00; 1 stop(s) via DFW; 321 minutes. Local airport times.
    • AA2579: DEN 2026-12-06 13:15:00 → DFW 2026-12-06 16:20:00; layover at DFW: 95 minutes.
    • AA2246: DFW 2026-12-06 17:55:00 → STL 2026-12-06 19:36:00.
  • Southwest Airlines WN4140: STL 2026-12-16 06:30:00 → DEN 2026-12-16 07:55:00; nonstop; 145 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $207.50

  • Frontier Airlines F93302: DEN 2026-12-06 08:00:00 → STL 2026-12-06 11:04:00; nonstop; 124 minutes. Local airport times.
  • Southwest Airlines WN4140: STL 2026-12-16 06:30:00 → DEN 2026-12-16 07:55:00; nonstop; 145 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $270.00

  • Southwest Airlines WN1807: DEN 2026-12-06 10:30:00 → STL 2026-12-06 13:30:00; nonstop; 120 minutes. Local airport times.
  • Southwest Airlines WN4140: STL 2026-12-16 06:30:00 → DEN 2026-12-16 07:55:00; nonstop; 145 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $280.00

  • United Airlines UA652: DEN 2026-12-06 09:35:00 → STL 2026-12-06 12:38:00; nonstop; 123 minutes. Local airport times.
  • United Airlines UA1605: STL 2026-12-16 08:40:00 → DEN 2026-12-16 10:11:00; nonstop; 151 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $277.50

  • Southwest Airlines WN235 / WN4472: DEN 2026-12-06 18:30:00 → STL 2026-12-07 00:35:00; 1 stop(s) via DAL; 305 minutes. Local airport times.
    • WN235: DEN 2026-12-06 18:30:00 → DAL 2026-12-06 21:30:00; layover at DAL: 80 minutes.
    • WN4472: DAL 2026-12-06 22:50:00 → STL 2026-12-07 00:35:00.
  • Southwest Airlines WN4140: STL 2026-12-16 06:30:00 → DEN 2026-12-16 07:55:00; nonstop; 145 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $277.50

  • Southwest Airlines WN2075 / WN2715: DEN 2026-12-06 14:00:00 → STL 2026-12-06 19:10:00; 1 stop(s) via MCI; 250 minutes. Local airport times.
    • WN2075: DEN 2026-12-06 14:00:00 → MCI 2026-12-06 16:35:00; layover at MCI: 90 minutes.
    • WN2715: MCI 2026-12-06 18:05:00 → STL 2026-12-06 19:10:00.
  • Southwest Airlines WN4140: STL 2026-12-16 06:30:00 → DEN 2026-12-16 07:55:00; nonstop; 145 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $277.50

  • Southwest Airlines WN1706 / WN3113: DEN 2026-12-06 10:40:00 → STL 2026-12-06 17:00:00; 1 stop(s) via MKE; 320 minutes. Local airport times.
    • WN1706: DEN 2026-12-06 10:40:00 → MKE 2026-12-06 13:55:00; layover at MKE: 105 minutes.
    • WN3113: MKE 2026-12-06 15:40:00 → STL 2026-12-06 17:00:00.
  • Southwest Airlines WN4140: STL 2026-12-16 06:30:00 → DEN 2026-12-16 07:55:00; nonstop; 145 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $277.50

  • Southwest Airlines WN2832 / WN3131: DEN 2026-12-06 11:05:00 → STL 2026-12-06 16:45:00; 1 stop(s) via MSP; 280 minutes. Local airport times.
    • WN2832: DEN 2026-12-06 11:05:00 → MSP 2026-12-06 14:05:00; layover at MSP: 65 minutes.
    • WN3131: MSP 2026-12-06 15:10:00 → STL 2026-12-06 16:45:00.
  • Southwest Airlines WN4140: STL 2026-12-16 06:30:00 → DEN 2026-12-16 07:55:00; nonstop; 145 minutes. Local airport times.

2026-12-06 → 2026-12-16 · $277.50

  • Southwest Airlines WN1573 / WN742: DEN 2026-12-06 14:25:00 → STL 2026-12-06 20:45:00; 1 stop(s) via BNA; 320 minutes. Local airport times.
    • WN1573: DEN 2026-12-06 14:25:00 → BNA 2026-12-06 17:45:00; layover at BNA: 105 minutes.
    • WN742: BNA 2026-12-06 19:30:00 → STL 2026-12-06 20:45:00.
  • Southwest Airlines WN4140: STL 2026-12-16 06:30:00 → DEN 2026-12-16 07:55:00; nonstop; 145 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Denver (DEN) to Saint Louis (STL) · Dec 6, 2026 · return Dec 16, 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 Denver to Saint Louis (STL) flight deals · 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. Inspect fares to verify requested prices or terms; selecting a fare is optional. Use that fare’s booking link to preserve its Membership price basis. State anything unverified. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and explain what remains unresolved. Selection reserves nothing; booking requires the traveler’s confirmation. 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.