Cheap Flights from Ontario, CA to Seattle, WA from $76

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On Cheapflightsplus.com you will find 13 direct and 113 connecting flights from Ontario to Seattle. You can compare airfare deals from 4 airlines and multiple travel sites from $76, book and save on cheap plane tickets and last minute offers. Also check out ONT-SEA flight schedule to find best flight time, convenient departure and arrival airports.

Find One-Way and Round-Trip Ontario to Seattle Flight Deals

To find the cheapest one way airline ticket select the date with the lowest price on the calendar below and click «Find Flights». To search for round-trip flight deals click on the link «Check prices for return flights» and select the date of the return flight. Cheapest flights in November: $76 (one-way), $130 (round-trip).

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Best Flights from Ontario to Seattle Today

Take a look at the list of non stop flights and flights with layovers from Ontario to Seattle with the lowest price of $76. The fastest direct flight takes 2h 37m and the fastest connecting – 3h 44m.

Price	Departure	Arrival	Flight Duration	Airline	Flight
from $76 Find flight	10:03 Ontario Ontario Int.	12:49 Seattle Seattle-Tacoma Intl	2h 46m	Frontier Airlines	F93164
from $90 Find flight	17:03 Ontario Ontario Int.	19:57 Seattle Seattle-Tacoma Intl	2h 54m	Frontier Airlines	F92275
from $92 Find flight	15:04 Ontario Ontario Int.	17:44 Seattle Seattle-Tacoma Intl	2h 40m	Hawaiian Airlines	HA6290
from $93 Find flight	14:21 Ontario Ontario Int.	16:58 Seattle Seattle-Tacoma Intl	2h 37m	Hawaiian Airlines	HA6307
from $93 Find flight	06:00 Ontario Ontario Int.	08:42 Seattle Seattle-Tacoma Intl	2h 42m	Hawaiian Airlines	HA6288
from $96 Find flight	15:04 Ontario Ontario Int.	17:44 Seattle Seattle-Tacoma Intl	2h 40m	Alaska Airlines	AS1119
from $96 Find flight	19:25 Ontario Ontario Int.	22:05 Seattle Seattle-Tacoma Intl	2h 40m	Alaska Airlines	AS1399
from $97 Find flight	14:21 Ontario Ontario Int.	16:58 Seattle Seattle-Tacoma Intl	2h 37m	Alaska Airlines	AS1242
from $97 Find flight	06:00 Ontario Ontario Int.	08:42 Seattle Seattle-Tacoma Intl	2h 42m	Alaska Airlines	AS1091
from $107 Find flight	18:58 Ontario Ontario Int.	21:37 Seattle Seattle-Tacoma Intl	2h 39m	Alaska Airlines	AS1087
from $136 Find flight	12:00 Ontario Ontario Int.	14:38 Seattle Seattle-Tacoma Intl	2h 38m	Hawaiian Airlines	HA6289
from $98 Find flight	10:03 Ontario Ontario Int.	14:20 Seattle Seattle-Tacoma Intl	4h 17m layover 1h 1m - Portland	Hawaiian Airlines	HA6284 HA6397
from $98 Find flight	18:11 Ontario Ontario Int.	00:31+1 день Seattle Seattle-Tacoma Intl	6h 20m layover 0h 56m - Denver	Frontier Airlines	F92908 F93405
from $98 Find flight	07:30 Ontario Ontario Int.	14:20 Seattle Seattle-Tacoma Intl	6h 50m layover 3h 36m - Portland	Hawaiian Airlines	HA6286 HA6397
from $105 Find flight	00:59 Ontario Ontario Int.	09:40 Seattle Seattle-Tacoma Intl	8h 41m layover 3h 14m - Denver	Frontier Airlines	F91500 F91175
from $106 Find flight	07:10 Ontario Ontario Int.	14:26 Seattle Seattle-Tacoma Intl	7h 16m layover 3h 57m - Portland	Alaska Airlines	AS1058 AS1016

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*Departure and arrival times - local. Prices indicated for one-way flights. Information updated on July 16, 2025

Flight Schedule Ontario (California) to Seattle (Washington)

Full flight schedule will help you in detecting at what time planes fly from Ontario to Seattle. You can also specify the concrete flights and airlines on the route and how long the flight actually is. Use the calendar for today, tomorrow or other specific date as some flights are available only on certain days of the week.

Departure	Flight Details	Flight Duration	Price
06:00 — 08:42	06:00 — 08:42 HA6288 Hawaiian Airlines Ontario — Seattle	2h 42m	Find flight from$93
06:00 — 08:42	06:00 — 08:42 AS1091 Alaska Airlines Ontario — Seattle	2h 42m	Find flight from$97
10:03 — 12:49	10:03 — 12:49 F93164 Frontier Airlines Ontario — Seattle	2h 46m	Find flight from$76
12:00 — 14:38	12:00 — 14:38 AS1111 Alaska Airlines Ontario — Seattle	2h 38m	Find flight from$118
12:00 — 14:38	12:00 — 14:38 HA6289 Hawaiian Airlines Ontario — Seattle	2h 38m	Find flight from$136
14:21 — 16:58	14:21 — 16:58 HA6307 Hawaiian Airlines Ontario — Seattle	2h 37m	Find flight from$93
14:21 — 16:58	14:21 — 16:58 AS1242 Alaska Airlines Ontario — Seattle	2h 37m	Find flight from$97
15:04 — 17:44	15:04 — 17:44 HA6290 Hawaiian Airlines Ontario — Seattle	2h 40m	Find flight from$92
15:04 — 17:44	15:04 — 17:44 AS1119 Alaska Airlines Ontario — Seattle	2h 40m	Find flight from$96
17:03 — 19:57	17:03 — 19:57 F92275 Frontier Airlines Ontario — Seattle	2h 54m	Find flight from$90
18:58 — 21:37	18:58 — 21:37 AS1087 Alaska Airlines Ontario — Seattle	2h 39m	Find flight from$107
18:58 — 21:37	18:58 — 21:37 HA6287 Hawaiian Airlines Ontario — Seattle	2h 39m	Find flight from$136
19:25 — 22:05	19:25 — 22:05 AS1399 Alaska Airlines Ontario — Seattle	2h 40m	Find flight from$96
00:59 — 09:40	00:59 — 04:19 F91500 Frontier Airlines Ontario — Denver 3h 14m stop 16:57 — 18:59 F91175 Frontier Airlines Denver — Seattle	8h 41m including layover	Find flight from$105
00:59 — 00:31 +1 day	00:59 — 04:19 F91500 Frontier Airlines Ontario — Denver 18h 9m stop 22:29 — 00:34 F93405 Frontier Airlines Denver — Seattle	23h 32m including layover	Find flight from$105
07:10 — 14:26	07:10 — 09:27 AS1058 Alaska Airlines Ontario — Portland 3h 57m stop 13:24 — 14:26 AS1016 Alaska Airlines Portland — Seattle	7h 16m including layover	Find flight from$106
07:30 — 14:20	07:30 — 09:44 HA6286 Hawaiian Airlines Ontario — Portland 3h 36m stop 13:25 — 14:25 HA6397 Hawaiian Airlines Portland — Seattle	6h 50m including layover	Find flight from$98
09:35 — 14:19	09:35 — 10:54 UA1585 United Airlines Ontario — San Francisco 1h 11m stop 12:05 — 14:19 UA433 United Airlines San Francisco — Seattle	4h 44m including layover	Find flight from$127
09:35 — 16:09	09:35 — 10:54 UA1585 United Airlines Ontario — San Francisco 3h 1m stop 13:55 — 16:09 UA1008 United Airlines San Francisco — Seattle	6h 34m including layover	Find flight from$132
10:03 — 14:20	10:03 — 12:19 HA6284 Hawaiian Airlines Ontario — Portland 1h 1m stop 13:25 — 14:25 HA6397 Hawaiian Airlines Portland — Seattle	4h 17m including layover	Find flight from$98
13:35 — 18:49	13:35 — 14:54 UA1840 United Airlines Ontario — San Francisco 1h 41m stop 16:35 — 18:49 UA1636 United Airlines San Francisco — Seattle	5h 14m including layover	Find flight from$127
13:35 — 21:06	13:35 — 14:54 UA1840 United Airlines Ontario — San Francisco 3h 58m stop 18:52 — 21:06 UA2019 United Airlines San Francisco — Seattle	7h 31m including layover	Find flight from$132
17:45 — 21:55	17:45 — 20:03 HA6303 Hawaiian Airlines Ontario — Portland 56m stop 20:59 — 21:55 HA6402 Hawaiian Airlines Portland — Seattle	4h 10m including layover	Find flight from$119
18:11 — 00:31 +1 day	18:13 — 21:35 F92908 Frontier Airlines Ontario — Denver 56m stop 17:17 — 19:27 F93405 Frontier Airlines Denver — Seattle	6h 20m including layover	Find flight from$98
18:11 — 09:40 +1 day	17:21 — 20:44 F92908 Frontier Airlines Ontario — Denver 10h 1m stop 16:44 — 18:46 F91175 Frontier Airlines Denver — Seattle	15h 29m including layover	Find flight from$105
20:09 — 08:34 +1 day	20:09 — 01:24 F92924 Frontier Airlines Ontario — Dallas 4h 46m stop 06:10 — 08:34 F94065 Frontier Airlines Dallas — Seattle	12h 25m including layover	Find flight from$129

Departure	Arrival	Flight Details	Flight Time	Price
		stop stop	including layover	Find flight from$

*Departure and arrival times - local. Updated on July 16, 2025

Flight Information

Below we will explain in detail what the flights cost on the destination from Ontario to Seattle depends on and how to choose the most interesting flight option for you.

Distance between Ontario and Seattle is 1540 miles. Time difference between the cities is 0h. Airplanes depart 00:59 to 20:09 from 2 Ontario airports and arrive 00:59 to 20:09 to 3 Seattle airports. Average flight time is 2h 40m.

The fastest flight 2h 37m
Average flight time 2h 40m
The earliest flight 00:59
The latest flight 20:09
Distance 957 ml

The cheapest months to travel to Seattle are december (from 73 $), july (from 73 $), august (from 76 $).

The most expensive months are february (from 251 $), november (from 148 $), october (from 96 $).

What is the lowest airfare Ontario to Seattle?

The cheapest plane ticket found by our users is $76. This airfare is for economy class on one-way F93164 flight by Frontier Airlines for August 15, 2025 which leaves Ontario Int. in Ontario at 10:03 am and arrives at Seattle Seattle-Tacoma Intl at 12:49.

Economy class

$76

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Business class

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First class

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Popular Airlines on the Route

The flight Ontario — Seattle is served by 4 regular airlines and 1 low-cost airline. Most of the flights on this route are operated by Alaska Airlines - 46 departures per week at the price of from $ 96 . And the most expensive tickets are offered by United Airlines airline - from $ 583.

Direct flights

There are 13 nonstop flights on the route. The fastest direct flight is HA6307 by Hawaiian Airlines takes 2h 37m and the cheapest is F93164 by Frontier Airlines for $76.

AS - Alaska Airlines

from $96

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F9 - Frontier Airlines

from $76

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HA - Hawaiian Airlines

from $92

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See more direct flights

Connecting Flights

There are 113 flights with layovers on the route. The fastest connecting flight is AS2202 by Alaska Airlines takes 3h 44m and the cheapest is F93164 by Frontier Airlines for $98.

AS - Alaska Airlines

from $106

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F9 - Frontier Airlines

from $98

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HA - Hawaiian Airlines

from $98

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UA - United Airlines

from $127

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See more connecting flights

Airports

You can fly from Ontario to Seattle from 2 airports (Ontario Int., International Heliport).

Ontario airports

Ontario Int.-ONT

from $76
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International Heliport-JIO

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Seattle airports

Boeing Field International Airport-BFI

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Seattle-Tacoma Intl-SEA

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Kenmore Air Harbor SPB-LKE

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Airplanes

There are flights to Seattle from Ontario by 4 airlines that use 0 aircraft brands. They range from huge modern airplanes to small-sized.

Top Domestic Destinations from Ontario

You may also consider searching for discounted plane tickets to some other popular places from Ontario within United States.

Ontario — Phoenix

from $56

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Ontario — Denver

from $65

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Ontario — Austin

from $67

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Ontario — Miami

from $62

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Ontario — Tucson

from $80

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Ontario — Las Vegas

from $63

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Ontario — Seattle

from $65

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Ontario — Boise

from $70

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Ontario — Chicago

from $78

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Ontario — Philadelphia

from $62

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Top International Destinations from Ontario

Our state-of-the art metasearch will definitely provide you with the best airfare on international flights. We’re proud to partner with many reliable travel suppliers located outside the US what gives us an opportunity to offer the most competitive prices on far destinations.

Ontario — London

from $62

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Ontario — San Jose

from $61

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Ontario — Guadalajara

from $70

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Ontario — Cancun

from $74

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How to book a plane ticket yourself?

Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find flights»
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That's it — you will receive an email with your e-ticket usually within 10 minutes after your flight is confirmed. Please, print the e-ticket and have it with you at the airport. You would need to have only a passport and/or a required form of ID to travel. Please, check your Visa requirements if you travel outside of the United States or Canada.
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