$397 Find Cheap Flights from Ontario to West Yellowstone - Compare and Save

Only Economy Class is available on flights from Ontario to West Yellowstone.

There are currently no nonstop flights available from Ontario to West Yellowstone. Flights with 1 layover take between 4h 52m and 7h 22m in total, depending on the connection.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

Round-trip flights from Ontario to West Yellowstone range from $388 to $481, with an average of $428 over the past 12 months. Anything below $388 counts as a good deal.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $509 to $1,159. That means the highest observed fare was about 2x higher than the lowest one.

Flights from Ontario to West Yellowstone usually depart from Ontario (ONT) and arrive at West Yellowstone (WYS).

Connecting flights from Ontario to West Yellowstone most commonly pass through:

• Salt Lake City (SLC) - 59% of one-stop connections
• Denver Intl (DEN) - 41% of one-stop connections
Together, these airports account for 100% of one-stop bookings on this route.

Yes. Being flexible with your travel dates can save you up to 49% on the Ontario to West Yellowstone route. Friday is the cheapest departure day at $293 round-trip on average, while Thursday is the most expensive at $573, a difference of $280. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Flying via Salt Lake City (SLC) gives the shortest average 1-stop total travel time at 4h 52m, compared with 7h 22m via Denver Intl (DEN).

West Yellowstone is 1 hour ahead of Ontario (Mountain Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.