St. Louis (STL)Chicago O'Hare (ORD)
- non-stop flights:
- 3–12 per day
- flight duration:
- at least
direct flight availability- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
airlinesfrom $250number of non-stop flights per airline and day of the week Sun Mon Tue Wed Thu Fri Sat 
2–5 2–5 2–5 2–5 1–5 2–5 2–5 
2–5 2–5 1–5 1–5 1–5 2–5 2–6 
1 1 1 1 1 1 1 Chicago (CHI)St. Louis (STL)
- non-stop flights:
- 7–16 per day
- flight duration:
- at least
direct flight availability- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
airlinesfrom $336number of non-stop flights per airline and day of the week Sun Mon Tue Wed Thu Fri Sat 
5 4–5 4–5 2–5 5 3 4–5 
2–5 2–5 2–5 2–5 2–5 2–5 2–5 
2–3 2–3 1–3 2–5 2–3 1–3 2–3 
1 1 1 1 1 1 1 St. Louis (STL)Chicago (CHI)
- non-stop flights:
- 6–17 per day
- flight duration:
- at least
direct flight availability- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
airlinesfrom $250number of non-stop flights per airline and day of the week Sun Mon Tue Wed Thu Fri Sat 
5 4–5 4–5 2–5 5 3 4–5 
2–5 2–5 2–5 2–5 1–5 2–5 2–5 
2–5 2–5 1–5 1–5 1–5 2–5 2–6 
1 1 1 1 1 1 1 Chicago O'Hare (ORD)St. Louis (STL)
- non-stop flights:
- 4–11 per day
- flight duration:
- at least
direct flight availability- Sun
- Mon
- Tue
- Wed
- Thu
- Fri
- Sat
airlinesfrom $395number of non-stop flights per airline and day of the week Sun Mon Tue Wed Thu Fri Sat 
2–5 2–5 2–5 2–5 2–5 2–5 2–5 
2–3 2–3 1–3 2–5 2–3 1–3 2–3 
1 1 1 1 1 1 1