Denver (DEN)Louisville (SDF)
- non-stop flights:
- 4–7 per day
- flight duration:
- at least
- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
from $464number of non-stop flights per airline and day of the week Sun Mon Tue Wed Thu Fri Sat 
4–7 4–7 4–7 4–7 4–7 4–7 4–7 Chicago (CHI)Louisville (SDF)
- non-stop flights:
- 7–20 per day
- flight duration:
- at least
- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
from $222number of non-stop flights per airline and day of the week Sun Mon Tue Wed Thu Fri Sat 
4–11 4–11 4–11 4–11 4–11 4–11 4–10 
3–9 3–9 3–9 3–9 3–9 3–9 3–10 Chicago O'Hare (ORD)Louisville (SDF)
- non-stop flights:
- 7–20 per day
- flight duration:
- at least
- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
from $222number of non-stop flights per airline and day of the week Sun Mon Tue Wed Thu Fri Sat 
4–11 4–11 4–11 4–11 4–11 4–11 4–10 
3–9 3–9 3–9 3–9 3–9 3–9 3–10 Atlanta (ATL)Louisville (SDF)
- non-stop flights:
- 9–17 per day
- flight duration:
- at least
- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
from $315number of non-stop flights per airline and day of the week Sun Mon Tue Wed Thu Fri Sat 
8–15 9–15 9–15 9–15 9–15 9–15 9–15 
1 1 1 0 0 0 0 
1 0 0 0 1 0 0 Washington DC (DCA)Louisville (SDF)
- non-stop flights:
- 1–5 per day
- flight duration:
- at least
- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
from $243number of non-stop flights per airline and day of the week Sun Mon Tue Wed Thu Fri Sat 
1–4 1–4 1–4 1–4 1–4 1–5 1–4 Cleveland (CLE)Louisville (SDF)
- non-stop flights:
- only flights with stopover
- flight duration:
- at least
- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
from $334