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Cheap flights from St Louis to Ontario from US$159
There are no direct flights from St Louis to Ontario. The fastest way is one stop via Phoenix or Las Vegas, about 4h 45m door to door (263 connections a week on current schedules), with fares from US$159.
No direct flights · 6 connection options From 4h 56m Cheapest in December Prices checked 13 days ago
St Louis to Ontario at a glance
Cheapest one-wayUS$159Frontier Airlines · 1 stop · Fri 18 DecCheapest returnUS$174Tue 22 Dec – Wed 30 DecFastest journey4h 56mFrontier Airlines · 1 stop
Nonstop flightsNoneConnect via Phoenix or Las Vegas
Best ways to fly from St Louis to Ontario
Ranked by how easy the connection is: one airline or alliance first (bags and connection protected), then the quickest self-transfer options.
1Search
STL Phoenix (PHX) ONT
Leg 1: American Airlines, Frontier Airlines, Southwest Airlines · Leg 2: American Airlines, Southwest Airlines, Envoy Air
Mon12:00 STL12:58 PHX0h 47m connection13:45 PHX14:45 ONTSouthwest Airlines
2Search
STL Las Vegas (LAS) ONT
Leg 1: Frontier Airlines, Southwest Airlines, Sun Country Airlines · Leg 2: Frontier Airlines, Southwest Airlines
Wed05:45 STL06:56 LAS0h 49m connection07:45 LAS08:34 ONTSouthwest Airlines
3Search
STL Denver (DEN) ONT
Leg 1: Frontier Airlines, Southwest Airlines, United Airlines · Leg 2: Frontier Airlines, Southwest Airlines, United Airlines
Tue07:00 STL08:02 DEN0h 58m connection09:00 DEN10:05 ONTSouthwest Airlines
4Search
STL Dallas (DFW) ONT
Leg 1: American Airlines, Frontier Airlines, Envoy Air · Leg 2: American Airlines, Frontier Airlines
Wed10:15 STL11:53 DFW0h 52m connection12:45 DFW13:34 ONTAmerican Airlines
5Search
STL Salt Lake City (SLC) ONT
Leg 1: Delta Air Lines, Southwest Airlines · Leg 2: Delta Air Lines, SkyWest
Mon19:45 STL21:45 SLC1h 00m connection22:45 SLC23:23 ONTDelta Air Lines
6Search
STL Chicago (ORD) ONT
Leg 1: American Airlines, United Airlines, GoJet Airlines · Leg 2: United Airlines, Volaris
Sun19:30 STL20:43 ORD1h 02m connection21:45 ORD23:41 ONTUnited Airlines
Connections are computed from flights actually flown over the last 8 weeks, with at least 45 minutes to change on one airline and 2 hours on separate tickets. Times are local. The search shows live itineraries and exact times.
Cheapest dates from St Louis to Ontario
The lowest one-way fares found recently, cheapest first. Prices change; click through for the live fare.
Good to know
- Distance
- 2,500 km1,553 miles
- Journey time
- 4h 56mfastest found
- Time difference
- -2hOntario vs St Louis
- Currency in Ontario
- USD
- Airports
- STL → ONT
Flights from St Louis to Ontario: questions answered
How much is a flight from St Louis to Ontario?
The cheapest one-way fare we found recently is US$159 with 1 stop, departing in December. Return trips start from US$174. Prices change constantly, so search your dates for the live fare.
Are there direct flights from St Louis to Ontario?
No. There is no nonstop service, so you will connect, most easily in Phoenix, Las Vegas and Denver. Some connections are on one airline or alliance, so your bags and connection are protected on a single ticket.
How long is the flight from St Louis to Ontario?
With one connection the journey usually takes around 4h 56m, depending on the layover. The straight-line distance is 2,500 km.
Where do you change planes between St Louis and Ontario?
The best connecting points are Phoenix (PHX), Las Vegas (LAS), Denver (DEN) and Dallas (DFW). American Airlines flies both legs via Phoenix, so you can book it as one ticket.
Which airports serve St Louis and Ontario?
St Louis: St. Louis Lambert International Airport (STL). Ontario: Ontario International Airport (ONT).
What is the time difference between St Louis and Ontario?
Ontario is 2 hours behind St Louis.
