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
08/24/25
direct
AS1040
02h 42min
Return
-
Alaska Airlines
$178
Best option
Seattle-Tacoma
Ontario
Outbound
10/18/25
direct
AS1003
02h 34min
Return
11/17/25
direct
AS0594
02h 49min
Alaska Airlines ?
$168
Seattle-Tacoma
Ontario
Outbound
10/18/25
direct
AS1254
02h 43min
Return
11/17/25
direct
F93164
02h 56min
Alaska Airlines
$171
Seattle-Tacoma
Ontario
Outbound
10/18/25
direct
AS1003
02h 34min
Return
11/17/25
direct
AS0594
02h 49min
Alaska Airlines
$173
Seattle-Tacoma
Ontario
Outbound
10/18/25
direct
AS1254
02h 43min
Return
11/17/25
direct
AS0607
02h 50min
Alaska Airlines ?
$174
Seattle-Tacoma
Ontario
Outbound
10/18/25
1 Stopover (DEN)
F93406, F91499
17h 50min
Return
11/17/25
direct
F93164
02h 56min
Frontier Airlines
$201
Seattle-Tacoma
Ontario
Outbound
10/18/25
1 Stopover (DEN)
F93406, F91499
17h 50min
Return
11/17/25
direct
F93164
02h 56min
Frontier Airlines
$211
Seattle-Tacoma
Ontario
Outbound
10/18/25
1 Stopover (SFO)
UA2482, UA0448
05h 17min
Return
11/17/25
1 Stopover (SFO)
UA0277, UA0433
06h 51min
United Airlines ?
$251
Seattle-Tacoma
Ontario
Outbound
10/18/25
direct
AS1254
02h 43min
Return
11/17/25
direct
HA6361
02h 50min
Alaska Airlines ?
$302
Seattle-Tacoma
Ontario
Outbound
08/24/25
direct
AS1040
02h 42min
Return
08/31/25
direct
AS1111
02h 40min
Alaska Airlines
$317
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

Cheapest outbound flight from $177.97
Roundtrip from $167.19
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