Cheap flights from Ontario to St. Louis

Round-trip
1 adult
Economy
From?
To?
Sun 10/24
Sun 10/31

Travel Restriction Alert

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

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

Find info about flight duration, direct flights, and airports for your flight from Ontario to St. Louis
Best Price Found$167The best flight deal from Ontario to St. Louis found on momondo in the last 72 hours is $167
Fastest flight time5h 17mThe fastest flight from Ontario to St. Louis takes 5h 17m
Direct flightsNoneThere are no direct flights from Ontario to St. Louis. Popular non-direct route for this connection is Ontario Airport - Lambert-St Louis Airport.
Airports in St. Louis1 airportThere is 1 airport near St. Louis: Lambert-St Louis (STL)

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

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 Ontario to St. Louis?

September

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

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

Tuesday

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

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

in the afternoon

Ontario to St. Louis flights are approximately 46% more expensive in the morning than in the afternoon

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

Frontier

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

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

Ontario - Lambert-St Louis

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

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

40 days before

The cheapest time to buy a flight from Ontario to St. Louis is approximately 40 days to departure


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

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 Ontario to St. Louis by changing tabs
Frontier
Dec 7
ONT10:38 amOntario
15h 32m
1 stop
STL2:10 amLambert-St Louis
Dec 11
STL5:26 pmLambert-St Louis
20h 19m
1 stop
ONT1:45 pmOntario
Multiple Airlines
Nov 12
ONT6:56 pmOntario
10h 36m
1 stop
STL5:32 amLambert-St Louis
Nov 15
STL3:08 pmLambert-St Louis
16h 23m
1 stop
ONT7:31 amOntario
American Airlines
Nov 8
ONT6:59 pmOntario
10h 17m
1 stop
STL5:16 amLambert-St Louis
Nov 10
STL1:00 amLambert-St Louis
6h 10m
1 stop
ONT7:10 amOntario
United Airlines
Dec 19
ONT8:21 amOntario
8h 08m
1 stop
STL4:29 pmLambert-St Louis
Jan 5
STL3:46 amLambert-St Louis
5h 47m
1 stop
ONT9:33 amOntario
Frontier
Dec 9
ONT6:34 pmOntario
8h 46m
1 stop
STL3:20 amLambert-St Louis
Dec 11
STL4:53 amLambert-St Louis
15h 13m
1 stop
ONT8:06 pmOntario
Multiple Airlines
Dec 7
ONT8:20 amOntario
5h 33m
1 stop
STL1:53 pmLambert-St Louis
Dec 11
STL4:53 amLambert-St Louis
15h 13m
1 stop
ONT8:06 pmOntario

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

If you're looking for one-way flights from Ontario to St. Louis, view some of our deals below provided by American Airlines, Frontier and United Airlines
Frontier
Oct 27
ONT6:05 pmOntario
6h 01m
1 stop
STL12:06 amLambert-St Louis
American Airlines
Nov 15
ONT6:59 pmOntario
10h 17m
1 stop
STL5:16 amLambert-St Louis
United Airlines
Nov 13
ONT12:25 amOntario
5h 23m
1 stop
STL5:48 amLambert-St Louis

Search last-minute flights to St. Louis from Ontario

Find and compare flight prices for your last-minute flight from Ontario to St. Louis
Frontier
Oct 27
ONT6:05 pmOntario
6h 01m
1 stop
STL12:06 amLambert-St Louis
Nov 2
STL2:23 pmLambert-St Louis
16h 40m
1 stop
ONT7:03 amOntario
Multiple Airlines
Oct 27
ONT9:44 amOntario
20h 48m
2 stops
STL6:32 amLambert-St Louis
Nov 2
STL2:23 pmLambert-St Louis
16h 40m
1 stop
ONT7:03 amOntario
Frontier
Oct 28
ONT6:05 pmOntario
6h 01m
1 stop
STL12:06 amLambert-St Louis
Nov 1
STL4:30 amLambert-St Louis
9h 06m
2 stops
ONT1:36 pmOntario
Multiple Airlines
Oct 27
ONT6:05 pmOntario
6h 01m
1 stop
STL12:06 amLambert-St Louis
Nov 2
STL9:40 amLambert-St Louis
25h 19m
3 stops
ONT10:59 amOntario
Frontier
Oct 28
ONT11:31 amOntario
21h 15m
2 stops
STL8:46 amLambert-St Louis
Nov 1
STL4:30 amLambert-St Louis
9h 06m
2 stops
ONT1:36 pmOntario
Multiple Airlines
Oct 28
ONT6:05 pmOntario
6h 01m
1 stop
STL12:06 amLambert-St Louis
Nov 1
STL3:33 amLambert-St Louis
6h 49m
1 stop
ONT10:22 amOntario

Best airlines flying from Ontario to St. Louis

Compare and see reviews for airlines that fly from Ontario to St. Louis with momondo
AirlineRatingFree CancellationPrice
Frontier
PriceFrom $104
Free Cancellation
Rating
6.3
6.6

Boarding

6.0

Comfort

7.1

Crew

4.8

Entertainment

5.1

Food

Reviews

Las azafatas NO eran amables. No te dan ni agua. Para todo hay que pagar. Los asientos super duros y no reclinaban. Pesimo!!

1 / 10
Delta
PriceFrom $149
Free Cancellation
Rating
8.2
8.2

Boarding

8.4

Comfort

8.3

Crew

8.1

Entertainment

8.0

Food

Reviews

Great

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

Not because the flight is going to Africa we can’t get better service on board

1 / 10
American Airlines
PriceFrom $159
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

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

    Some of our partner airlines flying from Ontario to Lambert-St Louis are adopting new policies due to the global impact of COVID-19. Some of the airlines that may be waiving their cancellation fees are American Airlines, Frontier, and United Airlines. You can search for the full list of airlines like American Airlines that are offering this flexibility.

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

    There are 1552.8 mi between Ontario and Lambert-St Louis. 5h 17m is a normal flight duration for this route.


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

Information is based on travel restrictions for travel to Lambert-St Louis within the United States

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

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.

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

Returning to Ontario from Lambert-St Louis

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.

If you are planning to travel to St. Louis 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 Ontario to St. Louis

Compare alternative flights to and from nearby airports and cities to discover the best prices and most convenient flight times
Los Angeles to St. Louis Flights
Fastest flight time3h 28m
Cheapest price$53
Oakland, California to Kansas City Flights
Fastest flight time4h 49m
Cheapest price$65
Los Angeles to Kansas City Flights
Fastest flight time3h 00m
Cheapest price$77
Oakland, California to St. Louis Flights
Fastest flight time6h 11m
Cheapest price$89
Ontario to Kansas City Flights
Fastest flight time5h 15m
Cheapest price$125
Santa Ana to Kansas City Flights
Fastest flight time5h 37m
Cheapest price$127
Santa Ana to St. Louis Flights
Fastest flight time6h 43m
Cheapest price$133
San Diego to Kansas City Flights
Fastest flight time5h 25m
Cheapest price$138
Burbank to St. Louis Flights
Fastest flight time5h 47m
Cheapest price$138
San Diego to St. Louis Flights
Fastest flight time5h 20m
Cheapest price$142
San Francisco to St. Louis Flights
Fastest flight time5h 14m
Cheapest price$142
San Francisco to Kansas City Flights
Fastest flight time3h 19m
Cheapest price$153

Similar Ontario to St. Louis flights

Flexible with your destination? Broaden your search and find flights similar to your Ontario to St. Louis route