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
Students
under 26
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 Jan 23 2017 Return: Tue Jan 31 2017 Trip spans 9 days
Major Airline
Major Airline
ONT
11:25p
STL
3:28a
28h 03m
2 stops
STL
8:50a
ONT
1:58a
17h 08m
2 stops
Depart: Tue Jan 10 2017 Return: Wed Jan 18 2017 Trip spans 9 days
United
United
ONT
7:50a
STL
4:58p
9h 08m
1 stop
STL
2:10a
ONT
9:20a
7h 10m
1 stop
Depart: Wed Jan 11 2017 Return: Tue Jan 17 2017 Trip spans 7 days
American Airlines
American Airlines
ONT
9:24a
STL
2:56p
5h 32m
1 stop
STL
9:30a
ONT
3:28p
5h 58m
1 stop
Depart: Sat Feb 4 2017 Return: Tue Feb 7 2017 Trip spans 4 days
Delta
Delta
ONT
8:15a
STL
1:51p
5h 36m
1 stop
STL
1:50p
ONT
8:04p
6h 14m
1 stop
Depart: Thu Mar 23 2017 Return: Mon Mar 27 2017 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
7:45a
STL
5:39p
9h 54m
1 stop
STL
2:25a
ONT
2:31p
12h 06m
1 stop
Depart: Tue Jan 17 2017 Return: Wed Jan 25 2017 Trip spans 9 days
American Airlines
American Airlines
ONT
5:54a
STL
11:23a
5h 29m
1 stop
STL
9:30a
ONT
3:28p
5h 58m
1 stop
Depart: Wed Jan 18 2017 Return: Wed Jan 25 2017 Trip spans 8 days
United
United
ONT
12:38a
STL
5:56a
5h 18m
1 stop
STL
4:01a
ONT
9:45a
5h 44m
1 stop
Depart: Fri Jan 27 2017 Return: Wed Feb 1 2017 Trip spans 6 days
Delta
Delta
ONT
5:36a
STL
11:14a
5h 38m
1 stop
STL
1:50p
ONT
8:04p
6h 14m
1 stop
Depart: Tue Jan 24 2017 Return: Sat Feb 4 2017 Trip spans 12 days
American Airlines
American Airlines
ONT
11:30a
STL
4:51p
5h 21m
1 stop
STL
1:00p
ONT
6:39p
5h 39m
1 stop
Depart: Thu Jan 19 2017 Return: Sat Jan 21 2017 Trip spans 3 days
United
United
ONT
12:38a
STL
6:02a
5h 24m
1 stop
STL
4:01a
ONT
9:47a
5h 46m
1 stop
Depart: Fri Mar 3 2017 Return: Sun Mar 5 2017 Trip spans 3 days
Major Airline
Major Airline
ONT
1:00a
STL
11:53a
10h 53m
1 stop
STL
8:30p
ONT
9:25a
12h 55m
1 stop
Depart: Wed Jan 25 2017 Return: Wed Feb 1 2017 Trip spans 8 days
American Airlines
American Airlines
ONT
1:09a
STL
9:32a
8h 23m
1 stop
STL
4:40a
ONT
10:30a
5h 50m
1 stop
Depart: Thu Jan 5 2017 Return: Mon Jan 9 2017 Trip spans 5 days
United
United
ONT
12:38a
STL
8:44a
8h 06m
1 stop
STL
12:46p
ONT
8:59p
8h 13m
1 stop
Depart: Fri Feb 17 2017 Return: Sun Feb 19 2017 Trip spans 3 days
Major Airline
Major Airline
ONT
1:00a
STL
11:53a
10h 53m
1 stop
STL
8:50a
ONT
1:58a
17h 08m
1 stop
Depart: Sat Jan 28 2017 Return: Sat Feb 4 2017 Trip spans 8 days
American Airlines
American Airlines
ONT
1:15a
STL
6:44a
5h 29m
1 stop
STL
9:30a
ONT
3:24p
5h 54m
1 stop
Depart: Sat Jan 14 2017 Return: Tue Jan 17 2017 Trip spans 4 days
United
United
ONT
12:38a
STL
8:44a
8h 06m
1 stop
STL
12:46p
ONT
8:59p
8h 13m
1 stop
Depart: Wed Feb 8 2017 Return: Wed Feb 15 2017 Trip spans 8 days
American Airlines
American Airlines
ONT
11:30a
STL
4:51p
5h 21m
1 stop
STL
1:00a
ONT
7:09a
6h 09m
1 stop
Depart: Mon Jan 30 2017 Return: Thu Feb 2 2017 Trip spans 4 days
United
United
ONT
12:38a
STL
5:55a
5h 17m
1 stop
STL
2:28a
ONT
9:43a
7h 15m
1 stop
Depart: Fri Dec 16 2016 Return: Mon Dec 19 2016 Trip spans 4 days
Major Airline
Major Airline
ONT
9:23a
STL
2:51p
5h 28m
1 stop
STL
12:55p
ONT
8:56p
8h 01m
1 stop
Depart: Sat Jan 21 2017 Return: Mon Jan 23 2017 Trip spans 3 days
American Airlines
American Airlines
ONT
1:15a
STL
6:44a
5h 29m
1 stop
STL
9:30a
ONT
3:28p
5h 58m
1 stop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

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Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

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
$305
Destination

St. Louis
$305