BKK to ONT, Suvarnabhumi Airport to Ontario International Airport Cheap Flights

Based on HopeGoo data, STARLUX Airlines offers one-way fares as low as US$456 on Cheapest nonstop routes (e.g. BKK to ONT on Wed, Mar 25), while STARLUX Airlines offers Cheapest nonstop round-trips from US$753 departing on Mon, Mar 23 and returning on Mon, Mar 30.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Bangkok to Ontario is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from Bangkok to Ontario, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Wed, Mar 25, with one-way flights priced at just US$456. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is STARLUX Airlines. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for Ontario travel is around September. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Bangkok to Ontario is October, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Bangkok to Ontario on February 27, 2026 with STARLUX Airlines, with prices starting at US$680.

The time difference between Ontario and Bangkok is 15h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your HopeGoo, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.