Flights from Seattle Tacoma to Ontario

Our cheapest offers for flights from Seattle Tacoma to Ontario

Here you can compare cheap flights from Seattle Tacoma (SEA) to Ontario (ONT) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to Ontario. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
Seattle-Tacoma
Ontario
Outbound
10/23/25
1 Stopover (DEN)
F93406, F91261
20h 33min
Return
10/26/25
direct
F93164
02h 56min
Frontier Airlines
$206
Best option
Seattle-Tacoma
Ontario
Outbound
10/23/25
direct
AS1003
02h 38min
Return
10/26/25
direct
AS0607
02h 50min
Alaska Airlines ?
$334
Seattle-Tacoma
Ontario
Outbound
10/23/25
1 Stopover (DEN)
F93406, F91261
20h 33min
Return
10/26/25
direct
F93164
02h 56min
Frontier Airlines
$207
Seattle-Tacoma
Ontario
Outbound
10/23/25
1 Stopover (LAS)
F94830, F92231
05h 29min
Return
10/26/25
direct
F93164
02h 56min
Frontier Airlines
$217
Seattle-Tacoma
Ontario
Outbound
10/23/25
direct
AS1254
02h 46min
Return
10/26/25
direct
AS0607
02h 50min
Alaska Airlines ?
$917
Prices based on recent searches, subject to last-minute changes
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Tips and tricks to help you find cheap flights from Seattle Tacoma to Ontario

Favorite airline: Frontier Airlines
The majority of passengers on the route Seattle-Tacoma – Ontario prefer to fly with Frontier Airlines.
Frontier Airlines
58 %
Alaska Airlines
26 %
Delta
12 %
Cheapest weekday: Tuesday
The cheapest flights on this route are operated on Tuesday.
Stopover flights are the cheapest connection
Direct flights on this route are $80.00 more expensive on average than flights with a stopover.
non stop flight
1 stop
02h 34min
19h 50min
$191
$111
Favourite connection: via Las Vegas
Flights with a stopover in Las Vegas are the most popular connection for this route.
Route
bookings
1 stopover Las Vegas - McCarran International Airport, NV
23h 41min, from $162
47 %
1 stopover Denver International Airport, CO
19h 50min, from $111
45 %
1 stopover Salt Lake City International Airport, UT
06h 52min, from $355
6 %

Important flight information

Flight information: Seattle-Tacoma - Ontario

Roundtrip from $205.95
Flight duration min. 02:30 / max. 03:20
Return flight duration min. 02:45/ max. 08:05
Distance 1542 km
Flights per week 23
Departure airport Airport Seattle-Tacoma International Airport, WA (SEA)
Arrival airport Airport Ontario-CA (ONT)
Destination country Flights to United States
Alternative routes to United States
Alternative flights to Ontario
Flight destinations with a similar price
Flight destinations with a similar price