Ontario to St Louis (ONT–STL) — Airlines, Schedules & Connections

ONT Airport Page →
airlines charter/private
On-time Some delays Frequent delays
Connecting Flight Schedule 20 1-stop flights
Nonstop Charter / private 1-Stop 2-Stop Hide separate tickets Hide overnight Hide codeshares
  Flight Airline AC Dep Arr Dur OTP Sched  
✈ Nonstop

No flights match your filters.

No scheduled airline flights on this route — it's flown by charter / private operators (). No nonstop flights on this route. connecting options below.

✦ 1-Stop connections via 10 hubs
DEN Denver 4h 55m ACF9UA → EJAF9UA Denver (DEN) to St Louis flights
LAS Las Vegas 4h 55m F9WNY4 → EJAF9WN Las Vegas (LAS) to St Louis flights
PHX Phoenix 4h 57m AACIPD → AAWN Phoenix (PHX) to St Louis flights
SLC Salt Lake City 5h 27m AFAMDL → DLKE Salt Lake City (SLC) to St Louis flights
DAL Dallas 5h 29m WN → WN Dallas (DAL) to St Louis flights
DFW Dallas-Fort Worth 5h 46m AABAF9 → AAASAY Dallas-Fort Worth (DFW) to St Louis flights
MDW Chicago 5h 48m WN → WN Chicago (MDW) to St Louis flights
BNA Nashville 5h 50m WN → WN Nashville (BNA) to St Louis flights
HOU Houston 5h 50m WN → EJAWN Houston (HOU) to St Louis flights
SMF Sacramento 6h 5m WN → WN Sacramento (SMF) to St Louis flights
✦ 1-STOP More options, longer trips
✧ 2-STOP Loading... Reach the hardest destinations
Ontario to St Louis
Connecting service available through multiple hubs.
+2h ahead

While no nonstop service exists between ONT and STL, 1-stop connecting options are available.

Also explore Browse available seat maps ONT Routes STL Routes ONT Live Flights STL Live Flights ONT Delays STL Delays
All flights from St Louis (STL) St Louis to Ontario flights
Connections

Connection Landscape

1-stop and 2-stop options for ONT to STL.
1-STOP
One-Stop Connections
20
Hubs
~4h
Fastest
~7h
Longest
DEN ~4h 55m LAS ~4h 55m PHX ~4h 57m SLC ~5h 27m DAL ~5h 29m
Verified with published schedule alignment and minimum connection time.
2-STOP
Two-Stop Connections
1,070
Candidates
Two-stop connections loaded in the connections tab above.
Connections computed from published schedules with minimum connection time verification. Use the interactive explorer above the fold to filter by airline, tier, and layover time.
Reliability

On-Time Performance

What to expect at each end of your journey.
Outbound
ONT → STL
100%
Generally reliable. Most flights run on time.
Departing
100%
Arriving
100%
Return
STL → ONT
0%
Frequent delays expected. Consider flexible booking.
Departing
0%
Arriving
100%
OTP = percentage of flights arriving within 15 min of schedule. Based on airport-level delay snapshots. ONT delays → STL delays →
Alternatives

Other ways to reach St Louis from Ontario

Nearby airports with service to St. Louis Lambert International Airport.
Metric ONT→STL SBD→STL SNA→STL
Distance from ONT – 21 mi 30 mi
Nonstop airlines – 2 7
Weekly flights – 1 1
Departure OTP 100% – –
San Bernardino (SBD) to St Louis flights · Santa Ana (SNA) to St Louis flights · Long Beach (LGB) to St Louis flights
Airports within 200 miles of ONT with service to St. Louis Lambert International Airport.
Know before you go

Travel Essentials

Practical planning for this route.
Time Difference
+2h
St Louis is 2 hours ahead of Ontario.
ONT: PDT · STL: CDT

When it's 6:00 PM in Ontario, it's 8:00 PM in St Louis.
Facts

ONT–STL Quick Facts

Key statistics for the Ontario to St Louis route.
Route details
Time difference+2 hours
Airlines (nonstop)0
1-stop connectionsAvailable
Origin: ONT
Full nameOntario International Airport
IATA / ICAOONT / KONT
TimezoneAmerica/Los_Angeles
Passengers/yr7.0M
Elevation944 ft / 288 m
Destination: STL
Full nameSt. Louis Lambert International Airport
IATA / ICAOSTL / KSTL
TimezoneAmerica/Chicago
Passengers/yr15.6M
Elevation618 ft / 188 m
FAQ

Frequently Asked Questions

Common questions about ONT to STL flights.
Yes, 1-stop connections are available, ranked by layover time. Common connecting points include Denver, Harry Reid and Phoenix Sky Harbor.
On a single ticket, yes. Your bags are checked through to STL and move between planes without you. On two separate tickets you collect your bags at the connecting airport and recheck them, so build in extra layover time.
St Louis is 2 hours ahead of Ontario.
Yes, return flights from STL to ONT are available. Use the direction toggle at the top to view the return schedule.
Nearby alternatives include SBD, SNA and LGB. See the Alternatives section for a full comparison.
Click the 'Search Flights' button to check availability and prices on Google Flights. You can also compare airlines and schedules on this page to find the best option.
See the On-Time Performance section for the latest delay data at both airports. This shows departure and arrival reliability to help you plan.
Route data is updated regularly from official airline schedules. On-time performance data comes from recent airport delay snapshots.

Connecting Options and Alternatives

1-stop connecting options are also available, commonly via Denver, Harry Reid and Phoenix Sky Harbor. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include San Bernardino (SBD), Santa Ana (SNA) and Long Beach (LGB).