Travel with Axel,
get the best price.

Route overview: Montreal to Louisville (SDF) flight deals

Montreal → Louisville

Dec 21, 2026 · return Dec 24, 2026

YUL → SDF1 adulteconomyRound trip

4 flight options · 4 airlines

One-stop flights

Mon, Dec 21 – Thu, Dec 24

American Airlines
4:01 pmYUL
7h 13m
PHL · 3h 2m
11:14 pmSDF
American Airlines
4:52 pmSDF
5h 53m
CLT · 1h 35m
10:45 pmYUL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Dec 21 – Thu, Dec 24

United Airlines
4:45 pmYUL
7h 4m
ORD · 2h 35m
11:49 pmSDF
United Airlines
1:59 pmSDF
7h 18m
ORD · 3h 5m
9:17 pmYUL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Dec 21 – Thu, Dec 24

Air Canada
9:25 amYUL
7h 14m
ORD · 3h 3m
4:39 pmSDF
American Airlines
4:52 pmSDF
5h 53m
CLT · 1h 35m
10:45 pmYUL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Mon, Dec 21 – Thu, Dec 24

Delta Air Lines
7:00 amYUL
6h 35m
ATL · 2h 2m
1:35 pmSDF
Delta Air Lines
5:56 pmSDF
5h 33m
DTW · 2h 10m
11:29 pmYUL

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Make this trip yours

YUL ⇄ 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, 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 Louisville 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 → 2026-12-24American AirlinesAA6011 + AA4697 / AA5405 + AA5137Axel-exclusive $544.002026-10-29T01:54:49Z
2026-12-21 → 2026-12-24United AirlinesUA3549 + UA3517 / UA5407 + UA3542Axel-exclusive $556.802026-10-29T01:54:49Z
2026-12-21 → 2026-12-24Air Canada / American AirlinesAC8477 + UA5606 / AA5405 + AA5137Axel-exclusive $560.002026-10-29T01:54:49Z
2026-12-21 → 2026-12-24Delta Air LinesDL2643 + DL3195 / DL5451 + DL5136Axel-exclusive $563.202026-10-29T01:54:49Z

Route overview: Montreal to Louisville (SDF) flight deals

2026-12-21 → 2026-12-24 · Axel-exclusive $544.00

  • American Airlines AA6011 / AA4697: YUL 2026-12-21 16:01:00 → SDF 2026-12-21 23:14:00; 1 stop(s) via PHL; 433 minutes. Local airport times.
    • AA6011: YUL 2026-12-21 16:01:00 → PHL 2026-12-21 17:55:00; layover at PHL: 182 minutes.
    • AA4697: PHL 2026-12-21 20:57:00 → SDF 2026-12-21 23:14:00.
  • American Airlines AA5405 / AA5137: SDF 2026-12-24 16:52:00 → YUL 2026-12-24 22:45:00; 1 stop(s) via CLT; 353 minutes. Local airport times.
    • AA5405: SDF 2026-12-24 16:52:00 → CLT 2026-12-24 18:37:00; layover at CLT: 95 minutes.
    • AA5137: CLT 2026-12-24 20:12:00 → YUL 2026-12-24 22:45:00.

2026-12-21 → 2026-12-24 · Axel-exclusive $556.80

  • United Airlines UA3549 / UA3517: YUL 2026-12-21 16:45:00 → SDF 2026-12-21 23:49:00; 1 stop(s) via ORD; 424 minutes. Local airport times.
    • UA3549: YUL 2026-12-21 16:45:00 → ORD 2026-12-21 18:45:00; layover at ORD: 155 minutes.
    • UA3517: ORD 2026-12-21 21:20:00 → SDF 2026-12-21 23:49:00.
  • United Airlines UA5407 / UA3542: SDF 2026-12-24 13:59:00 → YUL 2026-12-24 21:17:00; 1 stop(s) via ORD; 438 minutes. Local airport times.
    • UA5407: SDF 2026-12-24 13:59:00 → ORD 2026-12-24 14:40:00; layover at ORD: 185 minutes.
    • UA3542: ORD 2026-12-24 17:45:00 → YUL 2026-12-24 21:17:00.

2026-12-21 → 2026-12-24 · Axel-exclusive $560.00

  • Air Canada AC8477 / UA5606: YUL 2026-12-21 09:25:00 → SDF 2026-12-21 16:39:00; 1 stop(s) via ORD; 434 minutes. Local airport times.
    • AC8477: YUL 2026-12-21 09:25:00 → ORD 2026-12-21 11:07:00; layover at ORD: 183 minutes.
    • UA5606: ORD 2026-12-21 14:10:00 → SDF 2026-12-21 16:39:00.
  • American Airlines AA5405 / AA5137: SDF 2026-12-24 16:52:00 → YUL 2026-12-24 22:45:00; 1 stop(s) via CLT; 353 minutes. Local airport times.
    • AA5405: SDF 2026-12-24 16:52:00 → CLT 2026-12-24 18:37:00; layover at CLT: 95 minutes.
    • AA5137: CLT 2026-12-24 20:12:00 → YUL 2026-12-24 22:45:00.

2026-12-21 → 2026-12-24 · Axel-exclusive $563.20

  • Delta Air Lines DL2643 / DL3195: YUL 2026-12-21 07:00:00 → SDF 2026-12-21 13:35:00; 1 stop(s) via ATL; 395 minutes. Local airport times.
    • DL2643: YUL 2026-12-21 07:00:00 → ATL 2026-12-21 10:13:00; layover at ATL: 122 minutes.
    • DL3195: ATL 2026-12-21 12:15:00 → SDF 2026-12-21 13:35:00.
  • Delta Air Lines DL5451 / DL5136: SDF 2026-12-24 17:56:00 → YUL 2026-12-24 23:29:00; 1 stop(s) via DTW; 333 minutes. Local airport times.
    • DL5451: SDF 2026-12-24 17:56:00 → DTW 2026-12-24 19:22:00; layover at DTW: 130 minutes.
    • DL5136: DTW 2026-12-24 21:32:00 → YUL 2026-12-24 23:29:00.

Explore this route

For AI assistants

  • This page: Montreal (YUL) to Louisville (SDF) · Dec 21, 2026 · return Dec 24, 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 Montreal to Louisville (SDF) 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. 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.