Cheap flights from ONT to SEA (Ontario Intl. Airport to Seattle - Tacoma Intl.)

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Cheap Flights from ONT to SEA starting at $40 One Way, $105 Round Trip

Prices starting at $105 for return flights and $40 for one-way flights to Seattle - Tacoma Intl. were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Nov 13 - Mon, Nov 16
ONT
Ontario
SEA
Seattle
$105 Roundtrip, found 4 hours ago
$105
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Fri, Nov 13 from Ontario to Seattle, returning Mon, Nov 16, priced at $105 found 4 hours ago
Wed, Nov 11 - Sun, Nov 15
ONT
Ontario
SEA
Seattle
$127 Roundtrip, just found
$127
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Nov 11 from Ontario to Seattle, returning Sun, Nov 15, priced at $127 just found
Sat, Dec 5 - Mon, Dec 7
ONT
Ontario
SEA
Seattle
$138 Roundtrip, found 4 hours ago
$138
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Sat, Dec 5 from Ontario to Seattle, returning Mon, Dec 7, priced at $138 found 4 hours ago
Wed, Nov 11 - Sun, Nov 15
ONT
Ontario
SEA
Seattle
$140 Roundtrip, just found
$140
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Nov 11 from Ontario to Seattle, returning Sun, Nov 15, priced at $140 just found
Tue, Dec 15 - Tue, Jan 5
ONT
Ontario
SEA
Seattle
$245 Roundtrip, found 19 hours ago
$245
Roundtrip
found 19 hours ago
Select Bargain Flight flight, departing Tue, Dec 15 from Ontario to Seattle, returning Tue, Jan 5, priced at $245 found 19 hours ago

ONT to SEA Route Info

Origin Airport
Destination Airport
Number Of Airlines Serving
Distance
Shortest Flight Departure Time
Shortest Flight Departure Date
ONT Address & GPS
Address:
2900 E. Airport Drive
Ontario CA, 91761
United States
IATA Code:
ONT
Longitude:
-117.601193
Latitude:
34.056001
Time Zone:
America/Los_Angeles
SEA Address & GPS
Address:
Seattle WA, 98158
United States
IATA Code:
SEA
Longitude:
-122.301732
Latitude:
47.443839
Time Zone:
America/Los_Angeles

Frequently asked questions

Are there non-stop flights from ONT to Sea-Tac Airport?
We're just about to make your upcoming vacation even better — there are 3 airlines that will take you directly from ONT to SEA. Regular jetsetters recommend these top carriers:

  • Alaska Airlines
  • Delta Air Lines
  • Frontier Airlines

What is the shortest flight from ONT to Sea-Tac Airport?
If the weather is good and there are no delays, you could be jetting into SEA from Los Angeles - Ontario Intl. Airport (ONT) in as little as 2 hours and 51 minutes. With such a brief flight time, contemplate traveling with hand luggage only.
How many hours flight from ONT to Seattle - Tacoma Intl. Airport (SEA)?
The general flight time from ONT to SEA is a leisurely 2 hours and 54 minutes. So, throw a few things in your suitcase and hop on a flight. There's nothing more exhilarating than an impromptu vacation.
What airlines have the most flights from Ontario Airport to Sea-Tac Airport?
A worry-free, full-of-fun vacation starts with choosing a top-notch airline. Frontier Airlines (F9) offers 15 flights every month from ONT to Seattle - Tacoma Intl. Airport (SEA). Why not step on board and see why it has a reputation for being one of the best? Delta Air Lines (DL) also services the route from Ontario to Seattle. It's another reliable choice and has 73 flights monthly.

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Fare, taxes & fees: Fares include all taxes and fees, except baggage fees. Rates shown reflect fares found by other Orbitz users over the past 7 days. Due to rapidly changing airline prices & seat availability, these fares may no longer be available.

Refunds/changes/cancellations: Itinerary changes, if permitted for the fare, will have a $30 service fee charged by Orbitz. Additional airline charges may apply.

Other conditions: Schedules, fares and rules are subject to change without notice. Seats are limited and may not be available on all flights/dates or in all markets. Lower fares may be available. Fares will not be honored retroactively or in exchange for any wholly/partially unused ticket. Tickets are non-transferable and non-refundable. Fare rules are provided for the selected itinerary before booking.

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