Round-trip from | $235 (Frontier) |
---|---|
One-way from | $79 (Cheapflightsfares) |
Popular in | May |
Cheapest in | July |
Average price | $310 |
Fly from
Fly to
Route
Depart
Return
Price
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Mon 10/27
4:58 pm-9:07 am
2 stops17h 09m
Lambert-St Louis
Fri 10/31
4:52 pm-10:37 am
2 stops16h 45m
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Wed 9/24
11:35 am-3:04 pm
2 stops28h 29m
Lambert-St Louis
Sun 9/28
10:39 am-10:40 am
2 stops47h 01m
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Fri 10/3
5:05 pm-9:06 am
2 stops17h 01m
Lambert-St Louis
Mon 10/6
7:55 pm-2:13 pm
2 stops17h 18m
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Sat 10/18
12:38 pm-6:02 pm
1 stop6h 24m
Lambert-St Louis
Sun 10/19
1:41 pm-8:52 pm
1 stop6h 11m
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Sun 12/7
5:30 pm-11:15 pm
1 stop6h 45m
Lambert-St Louis
Tue 12/16
6:05 am-12:15 pm
1 stop5h 10m
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Sun 12/7
9:09 pm-8:45 am
1 stop12h 36m
Lambert-St Louis
Wed 12/17
5:11 pm-7:21 pm
1 stop25h 10m
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Mon 9/22
5:05 pm-9:06 am
2 stops17h 01m
Lambert-St Louis
Fri 9/26
7:55 pm-10:55 am
2 stops14h 00m
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Sat 10/4
5:05 pm-9:06 am
2 stops17h 01m
Lambert-St Louis
Tue 10/7
7:52 pm-2:13 pm
2 stops17h 21m
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Sat 10/25
12:38 pm-6:02 pm
1 stop6h 24m
IslipSt. Louis
ISP - STL
ISPSTL
Islip Long Island
Sat 10/18
12:38 pm-6:02 pm
1 stop6h 24m
Currently, August is the cheapest month in which you can book a flight from Islip to St. Louis (average of $311). Flying from Islip to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
When flying from Islip to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Boarding
Entertainment
Overall
Comfort
Food
Crew
Reviews
Mike,Aug 2025
OKC - AUS
Boarding
Entertainment
Overall
Comfort
Food
Crew
Reviews
Mike,Aug 2025
OKC - AUS
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$304 | Average$391 | FlexibilityNo cancel fee | On-time63% |