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

STL Airport Page →
1,543 mi airlines 0/wk
On-time Some delays Frequent delays
Connecting Flight Schedule 45 1-stop flights Verified 3w ago
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  Flight Airline AC Dep Arr Dur OTP Sched  
✈ Nonstop

No flights match your filters.

No nonstop flights on this route. connecting options below.

✦ 1-STOP More options, longer trips
✧ 2-STOP Loading... Reach the hardest destinations
St Louis to Ontario
Connecting service available through multiple hubs.
1,543 mi 4h 31m nonstop -2h behind 45 1-stop hubs

While no nonstop service exists between STL and ONT, connecting options are available through 45 hubs.

Also explore STL Routes ONT Routes STL Live Flights ONT Live Flights STL Delays ONT Delays
Connections

Connection Landscape

Beyond nonstop. 1-stop and 2-stop options for STL to ONT.
1-STOP
One-Stop Connections
45
Hubs
~5h
Fastest
~31h
Longest
Verified with published schedule alignment and minimum connection time.
2-STOP
Two-Stop Connections
1,267
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.
Know before you go

Travel Essentials

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

When it's 6:00 PM in St Louis, it's 4:00 PM in Ontario.
Distance & Flight Time
1,543 mi / 2,483 km
Nonstop flight time is approximately 4h 31m.
Facts

STL–ONT Quick Facts

Key statistics for the St Louis to Ontario route.
Route details
Distance1,543 mi / 2,483 km
Flight time4h 31m
Time difference-2 hours
Airlines (nonstop)0
1-stop connections45 hubs
Origin: STL
Full nameSt. Louis Lambert International Airport
IATA / ICAOSTL / KSTL
TimezoneAmerica/Chicago
Passengers/yr15.6M
Elevation618 ft / 188 m
Destination: ONT
Full nameOntario International Airport
IATA / ICAOONT / KONT
TimezoneAmerica/Los_Angeles
Passengers/yr7.0M
Elevation944 ft / 288 m
FAQ

Frequently Asked Questions

Common questions about STL to ONT flights.
Nonstop flights from St. Louis Lambert International Airport to Ontario International Airport take approximately 4h 31m. The route covers 1,543 miles.
Yes, 1-stop connections are available through VNY, AFW, SBD, APA, IND, SCF, SJC, LIT, SBA, MSP, BUR, BOI, LEX, SJD, CVG, PBI, MCO, GYR, PHL, EWR, FLL, MLB, BOS, MIA, ATL, ORD, IAH, CLT, KOA, DFW, PHX, DEN, LAS, SEA, BNA, SMF, SLC, HOU, PDX, AUS, SFO, MDW, DAL, BWI and JFK. These options provide additional schedule flexibility.
Ontario is 2 hours behind St Louis.
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.

Flights from STL to ONT

St. Louis Lambert International Airport (STL) and Ontario International Airport (ONT) are connected through multiple connecting hub airports.

STL to ONT Flight Duration and Schedule

Nonstop flight time from STL to ONT ranges from 4 hours 31 minutes. The route covers a distance of 1,543 miles (2,483 km).

Connecting Options and Alternatives

45 one-stop connections are available, with the fastest taking approximately 5 hours via VNY. Two-stop connections are also available via intermediate hubs.