Travel with Axel,
get the best price.

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

Denver → Saint Louis

May 29, 2027 · return Jun 5, 2027

DEN → STL1 adulteconomyRound trip

12 flight options · 4 airlines

Nonstop flights

Sat, May 29 – Sat, Jun 5

Frontier Airlines
12:23 pmDEN
2h 3m
Nonstop
3:26 pmSTL
Frontier Airlines
7:59 pmSTL
2h 31m
Nonstop
9:30 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, May 29 – Sat, Jun 5

Southwest Airlines
10:30 amDEN
2h
Nonstop
1:30 pmSTL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

Frontier Airlines
7:55 amDEN
2h 8m
Nonstop
11:03 amSTL
Frontier Airlines
7:59 pmSTL
2h 31m
Nonstop
9:30 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, May 29 – Sat, Jun 5

Southwest Airlines
9:55 pmDEN
2h
Nonstop
12:55 am+1STL
Southwest Airlines
12:55 pmSTL
2h 20m
Nonstop
2:15 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

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

Explore this route

All dates for this routeMay 28, 2027 → Jun 4, 2027May 30, 2027 → Jun 6, 2027
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: opening any fare on this page checks it live and shows the current bookable total for 1 adult. Check live prices for Denver (DEN) to Saint Louis (STL), May 29, 2027 · return Jun 5, 2027

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

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2027-05-29 → 2027-06-05Frontier AirlinesF9630 / F94567$198.882026-10-29T01:05:09Z
2027-05-29 → 2027-06-05Southwest AirlinesWN719 / WN1508$349.382026-10-29T01:05:09Z
2027-05-29 → 2027-06-05United AirlinesUA1639 / UA663$360.132026-10-29T01:05:09Z
2027-05-29 → 2027-06-05American Airlines / Southwest AirlinesAA2579 + AA2246 / WN1508$360.882026-10-29T01:05:09Z
2027-05-29 → 2027-06-05Frontier AirlinesF93302 / F94567$198.882026-10-29T01:05:09Z
2027-05-29 → 2027-06-05Southwest AirlinesWN1845 / WN1508$349.382026-10-29T01:05:09Z
2027-05-29 → 2027-06-05United AirlinesUA652 / UA663$360.132026-10-29T01:05:09Z
2027-05-29 → 2027-06-05Southwest AirlinesWN2832 + WN3131 / WN1508$355.132026-10-29T01:05:09Z
2027-05-29 → 2027-06-05Southwest AirlinesWN1573 + WN742 / WN1508$355.132026-10-29T01:05:09Z
2027-05-29 → 2027-06-05Southwest AirlinesWN1706 + WN3113 / WN1508$355.132026-10-29T01:05:09Z
2027-05-29 → 2027-06-05Southwest AirlinesWN2075 + WN2715 / WN1508$355.132026-10-29T01:05:09Z
2027-05-29 → 2027-06-05Southwest AirlinesWN235 + WN4472 / WN1508$355.132026-10-29T01:05:09Z

2027-05-29 → 2027-06-05 · $198.88

  • Frontier Airlines F9630: DEN 2027-05-29 12:23:00 → STL 2027-05-29 15:26:00; nonstop; 123 minutes. Local airport times.
  • Frontier Airlines F94567: STL 2027-06-05 19:59:00 → DEN 2027-06-05 21:30:00; nonstop; 151 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $349.38

  • Southwest Airlines WN719: DEN 2027-05-29 10:30:00 → STL 2027-05-29 13:30:00; nonstop; 120 minutes. Local airport times.
  • Southwest Airlines WN1508: STL 2027-06-05 12:55:00 → DEN 2027-06-05 14:15:00; nonstop; 140 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $360.13

  • United Airlines UA1639: DEN 2027-05-29 13:55:00 → STL 2027-05-29 16:57:00; nonstop; 122 minutes. Local airport times.
  • United Airlines UA663: STL 2027-06-05 16:39:00 → DEN 2027-06-05 18:10:00; nonstop; 151 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $360.88

  • American Airlines AA2579 / AA2246: DEN 2027-05-29 13:15:00 → STL 2027-05-29 19:36:00; 1 stop(s) via DFW; 321 minutes. Local airport times.
    • AA2579: DEN 2027-05-29 13:15:00 → DFW 2027-05-29 16:20:00; layover at DFW: 95 minutes.
    • AA2246: DFW 2027-05-29 17:55:00 → STL 2027-05-29 19:36:00.
  • Southwest Airlines WN1508: STL 2027-06-05 12:55:00 → DEN 2027-06-05 14:15:00; nonstop; 140 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $198.88

  • Frontier Airlines F93302: DEN 2027-05-29 07:55:00 → STL 2027-05-29 11:03:00; nonstop; 128 minutes. Local airport times.
  • Frontier Airlines F94567: STL 2027-06-05 19:59:00 → DEN 2027-06-05 21:30:00; nonstop; 151 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $349.38

  • Southwest Airlines WN1845: DEN 2027-05-29 21:55:00 → STL 2027-05-30 00:55:00; nonstop; 120 minutes. Local airport times.
  • Southwest Airlines WN1508: STL 2027-06-05 12:55:00 → DEN 2027-06-05 14:15:00; nonstop; 140 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $360.13

  • United Airlines UA652: DEN 2027-05-29 09:35:00 → STL 2027-05-29 12:38:00; nonstop; 123 minutes. Local airport times.
  • United Airlines UA663: STL 2027-06-05 16:39:00 → DEN 2027-06-05 18:10:00; nonstop; 151 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $355.13

  • Southwest Airlines WN2832 / WN3131: DEN 2027-05-29 11:05:00 → STL 2027-05-29 16:45:00; 1 stop(s) via MSP; 280 minutes. Local airport times.
    • WN2832: DEN 2027-05-29 11:05:00 → MSP 2027-05-29 14:05:00; layover at MSP: 65 minutes.
    • WN3131: MSP 2027-05-29 15:10:00 → STL 2027-05-29 16:45:00.
  • Southwest Airlines WN1508: STL 2027-06-05 12:55:00 → DEN 2027-06-05 14:15:00; nonstop; 140 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $355.13

  • Southwest Airlines WN1573 / WN742: DEN 2027-05-29 14:25:00 → STL 2027-05-29 20:45:00; 1 stop(s) via BNA; 320 minutes. Local airport times.
    • WN1573: DEN 2027-05-29 14:25:00 → BNA 2027-05-29 17:45:00; layover at BNA: 105 minutes.
    • WN742: BNA 2027-05-29 19:30:00 → STL 2027-05-29 20:45:00.
  • Southwest Airlines WN1508: STL 2027-06-05 12:55:00 → DEN 2027-06-05 14:15:00; nonstop; 140 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $355.13

  • Southwest Airlines WN1706 / WN3113: DEN 2027-05-29 10:40:00 → STL 2027-05-29 17:00:00; 1 stop(s) via MKE; 320 minutes. Local airport times.
    • WN1706: DEN 2027-05-29 10:40:00 → MKE 2027-05-29 13:55:00; layover at MKE: 105 minutes.
    • WN3113: MKE 2027-05-29 15:40:00 → STL 2027-05-29 17:00:00.
  • Southwest Airlines WN1508: STL 2027-06-05 12:55:00 → DEN 2027-06-05 14:15:00; nonstop; 140 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $355.13

  • Southwest Airlines WN2075 / WN2715: DEN 2027-05-29 14:00:00 → STL 2027-05-29 19:10:00; 1 stop(s) via MCI; 250 minutes. Local airport times.
    • WN2075: DEN 2027-05-29 14:00:00 → MCI 2027-05-29 16:35:00; layover at MCI: 90 minutes.
    • WN2715: MCI 2027-05-29 18:05:00 → STL 2027-05-29 19:10:00.
  • Southwest Airlines WN1508: STL 2027-06-05 12:55:00 → DEN 2027-06-05 14:15:00; nonstop; 140 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $355.13

  • Southwest Airlines WN235 / WN4472: DEN 2027-05-29 18:30:00 → STL 2027-05-30 00:35:00; 1 stop(s) via DAL; 305 minutes. Local airport times.
    • WN235: DEN 2027-05-29 18:30:00 → DAL 2027-05-29 21:30:00; layover at DAL: 80 minutes.
    • WN4472: DAL 2027-05-29 22:50:00 → STL 2027-05-30 00:35:00.
  • Southwest Airlines WN1508: STL 2027-06-05 12:55:00 → DEN 2027-06-05 14:15:00; nonstop; 140 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Denver (DEN) to Saint Louis (STL) · May 29, 2027 · return Jun 5, 2027: 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 this page, share this page's complete link unchanged: Denver (DEN) to Saint Louis (STL), May 29, 2027 · return Jun 5, 2027. Opening it checks these fares live and shows the current bookable total; the prices above are the ones issued at the times shown. 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.