Find Deals on Flights from Ontario to Lambert-St Louis (ONT - STL)

Depart
Return
1 adult
Adults
18-64
Seniors
65+
Youths
12-17
Children
2-11
Seat Infants
under 2
Lap Infants
under 2
The price shown for each flight will be the average for all passengers including any infants.
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Book cheap flights from Ontario to Lambert-St Louis

(Round-trip)
Depart: Mon Mar 27 2017 Return: Tue Apr 4 2017 Trip spans 9 days
American Airlines
American Airlines
ONT
9:15p
STL
2:47a
5h 32m
1 stop
STL
5:39a
ONT
11:38a
5h 59m
1 stop
Depart: Tue Apr 11 2017 Return: Tue Apr 25 2017 Trip spans 15 days
United
United
ONT
9:25a
STL
4:56p
7h 31m
1 stop
STL
1:50a
ONT
10:36a
8h 46m
1 stop
Depart: Thu Apr 20 2017 Return: Wed Apr 26 2017 Trip spans 7 days
Delta
Delta
ONT
12:47p
STL
6:19p
5h 32m
1 stop
STL
1:40a
ONT
7:47a
6h 07m
1 stop
Depart: Wed May 17 2017 Return: Fri May 19 2017 Trip spans 3 days
Major Airline
Major Airline
ONT
12:45p
STL
3:54a
15h 09m
2 stops
STL
6:35a
ONT
2:10p
7h 35m
2 stops
Depart: Fri May 12 2017 Return: Sun May 14 2017 Trip spans 3 days
Alaska Airlines
Alaska Airlines
ONT
4:45p
STL
7:54a
15h 09m
1 stop
STL
3:20p
ONT
7:52a
16h 32m
1 stop
Depart: Wed Apr 12 2017 Return: Sat Apr 15 2017 Trip spans 4 days
American Airlines
American Airlines
ONT
10:30a
STL
3:59p
5h 29m
1 stop
STL
11:30a
ONT
7:00p
7h 30m
1 stop
Depart: Wed Apr 19 2017 Return: Wed May 10 2017 Trip spans 22 days
American Airlines
American Airlines
ONT
12:30p
STL
5:55p
5h 25m
1 stop
STL
3:20a
ONT
9:41a
6h 21m
1 stop
Depart: Fri Apr 14 2017 Return: Sat Apr 15 2017 Trip spans 2 days
United
United
ONT
3:56a
STL
11:34a
7h 38m
1 stop
STL
3:05a
ONT
10:06a
7h 01m
1 stop
Depart: Fri Apr 7 2017 Return: Sun Apr 9 2017 Trip spans 3 days
Delta
Delta
ONT
12:47p
STL
6:19p
5h 32m
1 stop
STL
1:40a
ONT
7:47a
6h 07m
1 stop
Depart: Tue Jun 6 2017 Return: Tue Jun 13 2017 Trip spans 8 days
United
United
ONT
1:35a
STL
9:42a
8h 07m
1 stop
STL
3:28a
ONT
10:38a
7h 10m
1 stop
Depart: Tue Mar 14 2017 Return: Tue Mar 21 2017 Trip spans 8 days
American Airlines
American Airlines
ONT
6:49a
STL
12:23p
5h 34m
1 stop
STL
2:00p
ONT
7:39p
5h 39m
1 stop
Depart: Sat May 6 2017 Return: Mon May 15 2017 Trip spans 10 days
American Airlines
American Airlines
ONT
6:55a
STL
2:07p
7h 12m
1 stop
STL
3:15p
ONT
9:20p
6h 05m
1 stop
Depart: Wed Mar 29 2017 Return: Tue Apr 4 2017 Trip spans 7 days
United
United
ONT
9:30a
STL
4:59p
7h 29m
1 stop
STL
4:55a
ONT
10:36a
5h 41m
1 stop
Depart: Fri Apr 21 2017 Return: Sun Apr 23 2017 Trip spans 3 days
Delta
Delta
ONT
12:47p
STL
6:19p
5h 32m
1 stop
STL
1:40a
ONT
7:47a
6h 07m
1 stop
Depart: Wed May 10 2017 Return: Thu Jun 1 2017 Trip spans 23 days
American Airlines
American Airlines
ONT
12:30p
STL
5:55p
5h 25m
1 stop
STL
3:20a
ONT
9:41a
6h 21m
1 stop
Depart: Tue May 23 2017 Return: Sun May 28 2017 Trip spans 6 days
United
United
ONT
1:35a
STL
9:42a
8h 07m
1 stop
STL
12:45p
ONT
6:34p
5h 49m
1 stop
Depart: Wed Mar 1 2017 Return: Sun Mar 5 2017 Trip spans 5 days
Major Airline
Major Airline
ONT
12:00a
STL
1:05a
1h 05m
nonstop
STL
8:00a
ONT
1:05p
5h 05m
nonstop
Depart: Mon Apr 17 2017 Return: Fri Apr 21 2017 Trip spans 5 days
Delta
Delta
ONT
12:47p
STL
6:19p
5h 32m
1 stop
STL
1:40a
ONT
7:47a
6h 07m
1 stop
Depart: Sat May 27 2017 Return: Thu Jun 1 2017 Trip spans 6 days
American Airlines
American Airlines
ONT
12:30p
STL
5:55p
5h 25m
1 stop
STL
3:20a
ONT
9:41a
6h 21m
1 stop
Depart: Thu Mar 2 2017 Return: Sun Mar 5 2017 Trip spans 4 days
Major Airline
Major Airline
ONT
12:00a
STL
1:05a
1h 05m
nonstop
STL
8:00a
ONT
1:05p
5h 05m
nonstop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

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Airports
Origin

Ontario
$308
Destination

St. Louis
$308