Which airline flies the most flights to ONT? The top airline carrier flying out of Ontario Intl. is Southwest Airlines and they fly over 1,138 flights every month. What are the cheapest flights from ONT? Ontario has a lot of discount flights in the month of March. Check out these great deals on flights from ONT:
- American Airlines - Los Angeles (ONT) to Charlotte (CLT) leaving on 3/31 at 7:25 pm and returning on 4/2 at 8:03 pm for only $641 per person.*
- Frontier Airlines - Los Angeles (ONT) to Denver (DEN) on 4/10 leaving at 5:30 am and returning on 4/12 at 9:07 am for only $147 per person.*
- American Airlines - Los Angeles (ONT) to Las Vegas (LAS) on 4/3 leaving at 12:45 pm and returning on 4/5 at 11:55 am for only $172 per person.*
- United - Los Angeles (ONT) to San Francisco (SFO) on 4/3 leaving at 4:30 pm and returning on 4/5 at 10:02 am for only $231 per person.*
*Prices vary and will be updated when you view current flight availability results. Deals displayed here are based on flight pricing and availability as of 03/20/2018 and may change as you get closer to the actual flight date. Deals displayed whose dates are in the past are no longer valid.