Travel with Axel,
get the best price.

Denver → Louisville

Dec 5, 2026 · return Dec 13, 2026

DEN → SDF1 adulteconomyRound trip

9 flight options · 3 airlines

Nonstop flights

Sat, Dec 5 – Sun, Dec 13

Southwest Airlines
6:20 pmDEN
2h 35m
Nonstop
10:55 pmSDF
Southwest Airlines
6:50 amSDF
3h 10m
Nonstop
8:00 amDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 5 – Sun, Dec 13

United Airlines
9:47 amDEN
2h 35m
Nonstop
2:22 pmSDF
United Airlines
8:00 amSDF
3h 4m
Nonstop
9:04 amDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 5 – Sun, Dec 13

United Airlines
5:45 pmDEN
2h 39m
Nonstop
10:24 pmSDF
United Airlines
8:00 amSDF
3h 4m
Nonstop
9:04 amDEN

Round-trip total · 1 adult · Taxes included

One-stop flights

Sat, Dec 5 – Sun, Dec 13

American Airlines
1:15 pmDEN
6h
DFW · 1h 47m
9:15 pmSDF
American Airlines
1:14 pmSDF
6h 6m
ORD · 1h 26m
5:20 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 5 – Sun, Dec 13

Southwest Airlines
2:25 pmDEN
6h 20m
BNA · 2h 55m
10:45 pmSDF
Southwest Airlines
6:50 amSDF
3h 10m
Nonstop
8:00 amDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 5 – Sun, Dec 13

Southwest Airlines
8:45 amDEN
4h 50m
MDW · 1h 15m
3:35 pmSDF
Southwest Airlines
6:50 amSDF
3h 10m
Nonstop
8:00 amDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 5 – Sun, Dec 13

Southwest Airlines
9:05 amDEN
5h 55m
HOU · 1h 25m
5:00 pmSDF
Southwest Airlines
6:50 amSDF
3h 10m
Nonstop
8:00 amDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 5 – Sun, Dec 13

United Airlines
4:35 pmDEN
5h 14m
ORD · 1h 5m
11:49 pmSDF
United Airlines
8:00 amSDF
3h 4m
Nonstop
9:04 amDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 5 – Sun, Dec 13

United Airlines
5:00 amDEN
6h 23m
IAH · 1h 27m
1:23 pmSDF
United Airlines
8:00 amSDF
3h 4m
Nonstop
9:04 amDEN

Round-trip total · 1 adult · Taxes included

Make this trip yours

DEN ⇄ SDF

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, Southwest 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)
2026-12-05 → 2026-12-13Southwest AirlinesWN1150 / WN3403$300.002026-10-29T01:05:09Z
2026-12-05 → 2026-12-13United AirlinesUA1479 / UA405$335.002026-10-29T01:05:09Z
2026-12-05 → 2026-12-13American AirlinesAA2579 + AA3673 / AA5316 + AA1466$300.002026-10-29T01:05:09Z
2026-12-05 → 2026-12-13United AirlinesUA514 / UA405$335.002026-10-29T01:05:09Z
2026-12-05 → 2026-12-13Southwest AirlinesWN1573 + WN4368 / WN3403$290.002026-10-29T01:05:09Z
2026-12-05 → 2026-12-13Southwest AirlinesWN1697 + WN349 / WN3403$290.002026-10-29T01:05:09Z
2026-12-05 → 2026-12-13Southwest AirlinesWN1649 + WN2189 / WN3403$290.002026-10-29T01:05:09Z
2026-12-05 → 2026-12-13United AirlinesUA675 + UA3517 / UA405$322.502026-10-29T01:05:09Z
2026-12-05 → 2026-12-13United AirlinesUA320 + UA3990 / UA405$322.502026-10-29T01:05:09Z

2026-12-05 → 2026-12-13 · $300.00

  • Southwest Airlines WN1150: DEN 2026-12-05 18:20:00 → SDF 2026-12-05 22:55:00; nonstop; 155 minutes. Local airport times.
  • Southwest Airlines WN3403: SDF 2026-12-13 06:50:00 → DEN 2026-12-13 08:00:00; nonstop; 190 minutes. Local airport times.

2026-12-05 → 2026-12-13 · $335.00

  • United Airlines UA1479: DEN 2026-12-05 09:47:00 → SDF 2026-12-05 14:22:00; nonstop; 155 minutes. Local airport times.
  • United Airlines UA405: SDF 2026-12-13 08:00:00 → DEN 2026-12-13 09:04:00; nonstop; 184 minutes. Local airport times.

2026-12-05 → 2026-12-13 · $300.00

  • American Airlines AA2579 / AA3673: DEN 2026-12-05 13:15:00 → SDF 2026-12-05 21:15:00; 1 stop(s) via DFW; 360 minutes. Local airport times.
    • AA2579: DEN 2026-12-05 13:15:00 → DFW 2026-12-05 16:20:00; layover at DFW: 107 minutes.
    • AA3673: DFW 2026-12-05 18:07:00 → SDF 2026-12-05 21:15:00.
  • American Airlines AA5316 / AA1466: SDF 2026-12-13 13:14:00 → DEN 2026-12-13 17:20:00; 1 stop(s) via ORD; 366 minutes. Local airport times.
    • AA5316: SDF 2026-12-13 13:14:00 → ORD 2026-12-13 13:57:00; layover at ORD: 86 minutes.
    • AA1466: ORD 2026-12-13 15:23:00 → DEN 2026-12-13 17:20:00.

2026-12-05 → 2026-12-13 · $335.00

  • United Airlines UA514: DEN 2026-12-05 17:45:00 → SDF 2026-12-05 22:24:00; nonstop; 159 minutes. Local airport times.
  • United Airlines UA405: SDF 2026-12-13 08:00:00 → DEN 2026-12-13 09:04:00; nonstop; 184 minutes. Local airport times.

2026-12-05 → 2026-12-13 · $290.00

  • Southwest Airlines WN1573 / WN4368: DEN 2026-12-05 14:25:00 → SDF 2026-12-05 22:45:00; 1 stop(s) via BNA; 380 minutes. Local airport times.
    • WN1573: DEN 2026-12-05 14:25:00 → BNA 2026-12-05 17:45:00; layover at BNA: 175 minutes.
    • WN4368: BNA 2026-12-05 20:40:00 → SDF 2026-12-05 22:45:00.
  • Southwest Airlines WN3403: SDF 2026-12-13 06:50:00 → DEN 2026-12-13 08:00:00; nonstop; 190 minutes. Local airport times.

2026-12-05 → 2026-12-13 · $290.00

  • Southwest Airlines WN1697 / WN349: DEN 2026-12-05 08:45:00 → SDF 2026-12-05 15:35:00; 1 stop(s) via MDW; 290 minutes. Local airport times.
    • WN1697: DEN 2026-12-05 08:45:00 → MDW 2026-12-05 12:05:00; layover at MDW: 75 minutes.
    • WN349: MDW 2026-12-05 13:20:00 → SDF 2026-12-05 15:35:00.
  • Southwest Airlines WN3403: SDF 2026-12-13 06:50:00 → DEN 2026-12-13 08:00:00; nonstop; 190 minutes. Local airport times.

2026-12-05 → 2026-12-13 · $290.00

  • Southwest Airlines WN1649 / WN2189: DEN 2026-12-05 09:05:00 → SDF 2026-12-05 17:00:00; 1 stop(s) via HOU; 355 minutes. Local airport times.
    • WN1649: DEN 2026-12-05 09:05:00 → HOU 2026-12-05 12:25:00; layover at HOU: 85 minutes.
    • WN2189: HOU 2026-12-05 13:50:00 → SDF 2026-12-05 17:00:00.
  • Southwest Airlines WN3403: SDF 2026-12-13 06:50:00 → DEN 2026-12-13 08:00:00; nonstop; 190 minutes. Local airport times.

2026-12-05 → 2026-12-13 · $322.50

  • United Airlines UA675 / UA3517: DEN 2026-12-05 16:35:00 → SDF 2026-12-05 23:49:00; 1 stop(s) via ORD; 314 minutes. Local airport times.
    • UA675: DEN 2026-12-05 16:35:00 → ORD 2026-12-05 20:15:00; layover at ORD: 65 minutes.
    • UA3517: ORD 2026-12-05 21:20:00 → SDF 2026-12-05 23:49:00.
  • United Airlines UA405: SDF 2026-12-13 08:00:00 → DEN 2026-12-13 09:04:00; nonstop; 184 minutes. Local airport times.

2026-12-05 → 2026-12-13 · $322.50

  • United Airlines UA320 / UA3990: DEN 2026-12-05 05:00:00 → SDF 2026-12-05 13:23:00; 1 stop(s) via IAH; 383 minutes. Local airport times.
    • UA320: DEN 2026-12-05 05:00:00 → IAH 2026-12-05 08:33:00; layover at IAH: 87 minutes.
    • UA3990: IAH 2026-12-05 10:00:00 → SDF 2026-12-05 13:23:00.
  • United Airlines UA405: SDF 2026-12-13 08:00:00 → DEN 2026-12-13 09:04:00; nonstop; 184 minutes. Local airport times.

More dates for this route