Frontier Airlines flights from ONT to SEA
Find comprehensive Frontier Airlines flight information, schedules, and booking details for direct flights from ONT to SEA. Frontier Airlines operates 4-9 flights daily flights on this route.• Flight Duration: 2h 40m - 3h 07m (average flight time)• Distance: 962 miles (1548 km) (air miles between airports)• Daily Flights: 4-9 flights (scheduled departures per day)
ONT
SEA
FLIGHT TIME
2h 40m - 3h 07m
FLIGHT DISTANCE
962 miles (1548 km)
2h 57m - 2h 57m
18:01
18:01
962 miles (1548 km)
April
1 (Show)
52
Frontier Airlines Flight Schedule from ONT to SEA
| Flight | Airline | Departure | Arrival | Aircraft |
|---|---|---|---|---|
F92275 |  Frontier Airlines | 18:01 | 20:58:00 | Airbus A321 |
Frontier Airlines Monthly Flight Calendar
December 2025
Route Insights
Pricing patterns: April typically offers lower prices due to reduced demand outside peak travel seasons.
Best departure times: Peak departure times are 18:00, offering more flight options and potentially better connections.
ONT - SEA flight price statistics
$249
ApproximateThe numbers are average prices found based on user searches for direct flights between the airports. It's calculated from the cheapest prices found per month for a round-trip with 1 adult and can vary depending on the amount of data we have for this particular route.
$196
Jan$438
Feb$217
Mar$158
Apr$158
May$398
Jun$311
Jul$258
Aug$198
Sep$198
Oct$218
Nov$238
DecFrontier Airlines Terminal Information
Terminal information for Frontier Airlines on this route is currently being updated. Please check back soon or contact the airports directly for terminal details.
Frequently Asked Questions about Frontier Airlines Flights
How many Frontier Airlines flights operate from ONT to SEA?
Frontier Airlines operates 1 flight from ONT to SEA.
What city does SEA airport serve?
SEA airport serves SeaTac.
How long is the Frontier Airlines flight from ONT to SEA?
The flight duration is approximately 2h 40m - 3h 07m.
What is the distance from ONT to SEA?
The distance is 962 miles (1548 km).
What aircraft does Frontier Airlines use on this route?
Frontier Airlines uses Airbus A321 on this route.
Which other airlines operate on this route?
2 other airlines operate on this route: Alaska Airlines, Delta Air Lines.
What is the cheapest month to fly Frontier Airlines from ONT to SEA?
April is typically the cheapest month to fly Frontier Airlines on this route.
What is the average price for a Frontier Airlines flight from ONT to SEA?
The average price for a round-trip Frontier Airlines flight on this route is approximately $249. Prices can vary based on booking time and demand.
How many Frontier Airlines flights operate per week on this route?
Frontier Airlines operates approximately 52 flights per week from ONT to SEA.