Ontario airport area
Isn't Panda Inn owned by the same people who own the Panda Express chain?
Ontario really isn't known for it's great food...really the entire area isn't know for it's great food, but there are some standouts in the surrounding area.
There's a great breakfast place in Rancho Cucamonga, which is roughly 10 mins north of where you're staying. Kick Back Jack/BC Cafe. Family-owned and operated...and blueberry pancakes so good...they taste like a blueberry muffin that's been smashed flat. The Super Home fries are awesome, too! Cut red potatoes that are cooked in a skillet and covered with cheese, green onion, sour cream, bacon, and avocado. They have a pretty mean corned beef hash, if you're interested. A little salty, but cooked to perfection so that you have the right amount to crunchy, crispy crust to balance the smooth mash of corned beef and potatoes.
If you're not from California, you should try In-N-Out...the best burgers...period. There are a couple by the airport. Visit the website for locations.
If you're a sushi fanatic, Ken's Restaurant in Rancho Cucamonga gets great reviews on this board. I've never been to Ken's, but I can recommend Kazama in Claremont and Sho Sushi in Upland. Kazama has a chef with over 30 years experience, and makes a great omakase. Sho Sushi is a really good AYCE place.
Old World Deli in Upland has some awesome broasted chicken...it's way flavorful and crispy than your run-of-the-mill fried chicken and comes with a broasted potato and a side order from their deli counter.
Handel's ice cream is the world's best ice cream. Every flavor accurately mimics what it's supposed to taste like. The cotton candy melts in your mouth. Other favorite flavors: strawberry cheesecake, blueberry cobbler, caramel apple, candy apple, banana cream pie, cinammon sticky bun, peppermint stick, rocky road...I think could go on and on.
Handel's Homemade Ice Cream
373 S Mountain Ave, Upland, CA 91786
101 N Indian Hill Blvd Ste C1-104A, Claremont, CA 91711
Old World Delicatessens
821 N Mountain Ave, Upland, CA
B C Cafe
10123 Foothill Blvd, Rancho Cucamonga, CA 91730
Sho Sushi Restaurant
373 E Foothill Blvd Ste D, Upland, CA 91786
What kind of food are you looking for? I know of a new Cuban place off of Archibald/8th that is doing alot of advertising, but I haven't personally been there. It's called Flamingo Palms. Taxi-able to get there from Ontario Airport...
You can probably shuttle to Ontario Mills, there are the run of the mill chain restaurants there. Victorial Gardens has a Cheesecake Factory, Fleming's, Corner Bakery- and a great crepe place.