Cheap flights from St. Louis to Ontario

Round-trip
1 adult
Economy
From?
To?
Sat 10/30
Sat 11/6

Travel Restriction Alert

The COVID-19 (coronavirus) outbreak may impact travel from Lambert-St Louis to Ontario.
View current United States travel restrictions

Flight information for St. Louis to Ontario
(STL to ONT)

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Ontario
Best Price Found$158The best flight deal from St. Louis to Ontario found on momondo in the last 72 hours is $158
Fastest flight time5h 49mThe fastest flight from St. Louis to Ontario takes 5h 49m
Direct flightsNoneThere are no direct flights from St. Louis to Ontario. Popular non-direct route for this connection is Lambert-St Louis Airport - Ontario Airport.
Airports in Ontario1 airportThere is 1 airport near Ontario: Ontario (ONT)

How to get the cheapest flight ticket from St. Louis to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly from St. Louis to Ontario?

August

The cheapest time of year to fly to Ontario from St. Louis is August. Most expensive is December

What is the cheapest day to depart St. Louis for Ontario?

Tuesday

The cheapest day of the week is typically Tuesday. The most expensive is typically Sunday

When is the cheapest time to fly from St. Louis to Ontario?

in the morning

St. Louis to Ontario flights are approximately 24% more expensive in the afternoon than in the morning

What is the cheapest airline that flies to Ontario from St. Louis?

Frontier

American Airlines, Delta, and Frontier are the most popular carriers operating from St. Louis to Ontario

What is the cheapest St. Louis to Ontario flight route?

Lambert-St Louis - Ontario

Fly from Lambert-St Louis to Ontario for the best St. Louis - Ontario flight prices

How far in advance should you book St. Louis to Ontario flights?

42 days before

The cheapest time to buy a flight from St. Louis to Ontario is approximately 42 days to departure


Easily compare round-trip flights from St. Louis to Ontario

Below you can see the best fares for your round-trip flight route over the next three months. All fares were found on momondo this week. Browse the quickest and cheapest flights from St. Louis to Ontario by changing tabs
Frontier
Dec 1
STL4:48 amLambert-St Louis
15h 06m
1 stop
ONT7:54 pmOntario
Dec 7
ONT1:08 pmOntario
9h 20m
1 stop
STL10:28 pmLambert-St Louis
Multiple Airlines
Dec 10
STL6:15 amLambert-St Louis
13h 51m
1 stop
ONT8:06 pmOntario
Dec 11
ONT6:59 pmOntario
10h 22m
1 stop
STL5:21 amLambert-St Louis
American Airlines
Nov 6
STL8:45 amLambert-St Louis
10h 14m
1 stop
ONT6:59 pmOntario
Nov 8
ONT6:59 pmOntario
10h 17m
1 stop
STL5:16 amLambert-St Louis
United Airlines
Jan 12
STL8:33 amLambert-St Louis
9h 10m
1 stop
ONT5:43 pmOntario
Jan 13
ONT6:52 pmOntario
8h 12m
1 stop
STL3:04 amLambert-St Louis
Delta
Dec 5
STL2:20 amLambert-St Louis
6h 50m
1 stop
ONT9:10 amOntario
Dec 6
ONT12:45 amOntario
5h 45m
1 stop
STL6:30 amLambert-St Louis
Frontier
Dec 1
STL1:07 pmLambert-St Louis
15h 00m
1 stop
ONT4:07 amOntario
Dec 8
ONT10:01 amOntario
12h 27m
1 stop
STL10:28 pmLambert-St Louis

Find the cheapest one-way flights from St. Louis to Ontario

If you're looking for one-way flights from St. Louis to Ontario, view some of our deals below provided by American Airlines and Frontier
Frontier
Nov 6
STL5:45 amLambert-St Louis
15h 17m
1 stop
ONT9:02 pmOntario
Multiple Airlines
Nov 3
STL10:57 amLambert-St Louis
8h 23m
1 stop
ONT7:20 pmOntario
American Airlines
Nov 9
STL7:25 amLambert-St Louis
10h 34m
1 stop
ONT5:59 pmOntario

Search last-minute flights to Ontario from St. Louis

Find and compare flight prices for your last-minute flight from St. Louis to Ontario
Multiple Airlines
Nov 4
STL5:39 amLambert-St Louis
12h 32m
1 stop
ONT6:11 pmOntario
Nov 7
ONT6:56 pmOntario
10h 36m
1 stop
STL5:32 amLambert-St Louis
Frontier
Nov 4
STL4:20 amLambert-St Louis
14h 46m
1 stop
ONT7:06 pmOntario
Nov 7
ONT6:56 pmOntario
12h 37m
1 stop
STL7:33 amLambert-St Louis
American Airlines
Nov 2
STL8:25 amLambert-St Louis
10h 34m
1 stop
ONT6:59 pmOntario
Nov 8
ONT6:59 pmOntario
10h 17m
1 stop
STL5:16 amLambert-St Louis
Frontier
Oct 31
STL4:20 amLambert-St Louis
14h 09m
1 stop
ONT6:29 pmOntario
Nov 5
ONT3:43 pmOntario
19h 39m
1 stop
STL11:22 amLambert-St Louis
Frontier
Oct 31
STL5:44 amLambert-St Louis
8h 44m
2 stops
ONT2:28 pmOntario
Nov 5
ONT3:43 pmOntario
19h 39m
1 stop
STL11:22 amLambert-St Louis
Alaska Airlines
Nov 2
STL5:38 amLambert-St Louis
13h 21m
2 stops
ONT6:59 pmOntario
Nov 8
ONT4:10 pmOntario
17h 12m
2 stops
STL9:22 amLambert-St Louis

Best airlines flying from St. Louis to Ontario

Compare and see reviews for airlines that fly from St. Louis to Ontario with momondo
AirlineRatingFree CancellationPrice
Frontier
PriceFrom $156
Free Cancellation
Rating
6.3
6.6

Boarding

5.9

Comfort

7.0

Crew

4.8

Entertainment

5.1

Food

Reviews

I tried to check in at the kiosk, this should have been fast because I prepaid for my carry on and wasn’t checking a bag. The kiosk said I needed to get in line to check in and it was a long line. Once I got to an agent, 35 minutes before my plane was to leave, he said I missed checkin and would have to be rescheduled. This new flight was 4 hours longer and then he forgot to return my passport to me, luckily he found me on the way to the restroom. I will do my best not to fly Frontier again.

1 / 10
United Airlines
PriceFrom $159
Free Cancellation
Rating
6.9
7.3

Boarding

6.7

Comfort

7.5

Crew

6.7

Entertainment

6.2

Food

Reviews

Basic economy experience needs to be at least on par with other airlines. Gate agent was rude and singled us out to step aside. Bags were lost despite paying for then, and claim agent told me it was because I was basic economy.

1 / 10
American Airlines
PriceFrom $199
Free Cancellation
Rating
7.2
7.4

Boarding

7.1

Comfort

7.8

Crew

7.1

Entertainment

6.8

Food

Reviews

Flight attendant for first class is definitely not a morning person. Oh and the WiFi DID NOT WORK!

1 / 10
Delta
PriceFrom $208
Free Cancellation
Rating
8.2
8.2

Boarding

8.4

Comfort

8.3

Crew

8.1

Entertainment

8.0

Food

Reviews

Great

1 / 10

  • Are airlines flying from Lambert-St Louis to Ontario offering flexible cancellation due to COVID-19?

    Due to the global impact of COVID-19, some of our airline partners operating flights from Lambert-St Louis to Ontario, such as American Airlines, Frontier, and United Airlines may have put in place flexible cancellation policies. Use our site to search for all of the airlines offering this flexibility to you.

  • How far is Lambert-St Louis to Ontario by plane?

    A flight from Lambert-St Louis to Ontario will travel around 1552.8 mi. 5h 45m is a normal flight duration for this route.


Can I fly to Ontario from Lambert-St Louis right now?

Information is based on travel restrictions for travel to Ontario within the United States

Most visitors from Lambert-St Louis need to provide a negative COVID-19 test result and/or quarantine to enter Ontario.

COVID-19 testing requirements
Visitors from Lambert-St Louis must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Ontario.

Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Ontario.

Can I fly back to Lambert-St Louis from Ontario?

Returning to Lambert-St Louis from Ontario

COVID-19 testing requirements
Visitors from Ontario must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Lambert-St Louis.

Quarantine requirements
Visitors from Ontario are not required to quarantine after entering Lambert-St Louis.

If you are planning to travel to Ontario at this time, it is recommended that you stay up to date on current restrictions and follow proper safety measures while in public.

Alternative routes for St. Louis to Ontario

Compare alternative flights to and from nearby airports and cities to discover the best prices and most convenient flight times
St. Louis to Los Angeles Flights
Fastest flight time3h 39m
Cheapest price$58
Kansas City to Los Angeles Flights
Fastest flight time3h 26m
Cheapest price$77
Kansas City to Oakland, California Flights
Fastest flight time5h 53m
Cheapest price$89
St. Louis to Oakland, California Flights
Fastest flight time9h 30m
Cheapest price$127
St. Louis to San Diego Flights
Fastest flight time6h 58m
Cheapest price$128
St. Louis to San Francisco Flights
Fastest flight time4h 33m
Cheapest price$140
St. Louis to Santa Ana Flights
Fastest flight time6h 00m
Cheapest price$141
Kansas City to San Diego Flights
Fastest flight time5h 34m
Cheapest price$149
Kansas City to San Francisco Flights
Fastest flight time3h 58m
Cheapest price$156
St. Louis to San Jose Flights
Fastest flight time6h 19m
Cheapest price$162
Kansas City to Santa Ana Flights
Fastest flight time5h 00m
Cheapest price$174
St. Louis to Sacramento Flights
Fastest flight time8h 42m
Cheapest price$176

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