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Flights from Ontario to Seattle – Direct & connecting routes

Non-stop airlines Connecting flights Show map Price search

ONT to SEA flights and routes map ONT to SEA – All flight route options from Ontario International Airport, California, USA to Seattle Tacoma International, Washington, USA. These flights are operated by 8 different airlines. Fly non-stop or choose from 8 different connecting flights. The shortest flight time is 2 hours and 40 minutes. See the full flight schedule and time table, including departure times, airlines and stopover details to find the best option for you.

From
To
USA ONT Ontario Airport Ontario, CA, USA
USA SEA Seattle Tacoma , WA, USA
ONT
Ontario Airport
USAOntario, CA, USA
Seattle Tacoma
USASeattle, WA, USA
SEA
3 direct routes found »
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14 routes with 1 stop found »
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Non-stop route options:

Duration

Alaska Airlines
Non-stop with Alaska Airlines. 4-6 flights per day.

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2h 40m

Alaska Airlines
Non-stop with Alaska Airlines.
2h 40m
4-6 flights per day.
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Delta Air Lines
Non-stop with Delta Air Lines. 4 flights per day.

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2h 48m

Delta Air Lines
Non-stop with Delta Air Lines.
2h 48m
4 flights per day.
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Frontier Airlines
Non-stop with Frontier Airlines. 1 flight per day.

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2h 50m

Frontier Airlines
Non-stop with Frontier Airlines.
2h 50m
1 flight per day.
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1 stop route options with the same airline:

Duration

Via Portland PDX
1 stop with Alaska Airlines. 3 flights per day.

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4h 35m

Via Portland PDX
1 stop with Alaska Airlines.
4h 35m
3 flights per day.
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Via Las Vegas LAS
1 stop with Frontier Airlines. 0-2 flights per day.
Begins in 4/9

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4h 50m

Begins in 4/9
Via Las Vegas LAS
1 stop with Frontier Airlines.
4h 50m
0-2 flights per day.
Begins in 4/9
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Via Sacramento SMF
1 stop with Southwest Airlines. 1-4 flights per day.

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4h 53m

Via Sacramento SMF
1 stop with Southwest Airlines.
4h 53m
1-4 flights per day.
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Via San Jose SJC
1 stop with Southwest Airlines. 0-2 flights per day.

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4h 55m

Via San Jose SJC
1 stop with Southwest Airlines.
4h 55m
0-2 flights per day.
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Via Oakland OAK
1 stop with Southwest Airlines. 0-4 flights per day.

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5h 00m

Via Oakland OAK
1 stop with Southwest Airlines.
5h 00m
0-4 flights per day.
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Via San Francisco SFO
1 stop with United Airlines. 3-5 flights per day.

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5h 31m

Via San Francisco SFO
1 stop with United Airlines.
5h 31m
3-5 flights per day.
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Via Salt Lake City SLC
1 stop with Delta Air Lines. 3-4 flights per day.

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5h 45m

Via Salt Lake City SLC
1 stop with Delta Air Lines.
5h 45m
3-4 flights per day.
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Via Las Vegas LAS
1 stop with Southwest Airlines. 1-2 flights per day.

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6h 00m

Via Las Vegas LAS
1 stop with Southwest Airlines.
6h 00m
1-2 flights per day.
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Via Phoenix PHX
1 stop with Southwest Airlines. 1-2 flights per day.

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6h 00m

Via Phoenix PHX
1 stop with Southwest Airlines.
6h 00m
1-2 flights per day.
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Via Phoenix PHX
1 stop with American Airlines. 2-3 flights per day.

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6h 29m

Via Phoenix PHX
1 stop with American Airlines.
6h 29m
2-3 flights per day.
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1 stop route options with codeshare or different airlines:

Duration

Via Portland PDX With Alaska Airlines & Hawaiian Airlines 3 flights per day.
CODESHARE

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4h 35m

Via Portland PDX
4h 35m
With Alaska Airlines & Hawaiian Airlines 3 flights per day.
CODESHARE
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Via San Francisco SFO With United Airlines & American Airlines 2-3 flights per day.
CODESHARE

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5h 27m

Via San Francisco SFO
5h 27m
With United Airlines & American Airlines 2-3 flights per day.
CODESHARE
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Via Salt Lake City SLC With Delta Air Lines & Alaska Airlines 0-1 flights per day.

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6h 24m

Via Salt Lake City SLC
6h 24m
With Delta Air Lines & Alaska Airlines 0-1 flights per day.
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Via Phoenix PHX With American Airlines & Alaska Airlines 2-4 flights per day.

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6h 30m

Via Phoenix PHX
6h 30m
With American Airlines & Alaska Airlines 2-4 flights per day.
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Ontario to Seattle flights

There are over 11 airlines and as many as 372 flights every week to this destination. You can fly non-stop to Seattle (SEA) from Ontario (ONT) with Alaska Airlines, Frontier Airlines or Delta Air Lines but if a stopover option suits you better you can choose to fly via Portland, Sacramento or any other of the 8 alternatives with connectiing airports.

Ontario to Seattle with Alaska Airlines

You can fly non-stop every weekday with flights departing from 6:00 am to 7:00 pm. You also have the option to do a transit flight via Portland. Alaska Airlines is a member of the air alliance OneWorld.

With Frontier Airlines

You can fly non-stop every weekday with flights departing between 9:00 am and 5:00 pm. You also have the option to do a transit flight via Las Vegas.

Distance & flight times: Ontario International Airport to Seattle Airport

The shortest flight time between ONT and SEA is 2 hours and 40 minutes.

ViaTotal flight timeLayover timeDistance
Direct2h 40m-962 miles (1548 km)
PDX Portland4h 35m56m973 miles (1566 km)
SMF Sacramento4h 53m40m1000 miles (1609 km)
SJC San Jose4h 55m1h 15m1035 miles (1665 km)
OAK Oakland5h 0m1h 35m1038 miles (1670 km)
SFO San Francisco5h 27m1h 46m1047 miles (1685 km)
LAS Las Vegas6h 0m1h 0m1069 miles (1720 km)
SLC Salt Lake City6h 24m2h 23m1252 miles (2014 km)
PHX Phoenix6h 29m1h 45m1439 miles (2315 km)
The flight times and layover times in the table above are approximate and may vary depending on flight number, aircraft, airline, weather, and time of day.ONT-SEA flight routesOntario to Seattle flight routes illustrated on a map.
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You can fly non-stop from Ontario (ONT) to Seattle (SEA) with Alaska Airlines, Frontier Airlines or Delta Air Lines. The flight takes approximately 2 hours and 40 minutes. If you travel with a connecting flight instead, for example via Portland, the total flight time will be 4 hours and 35 minutes.

If you're interested in direct flights, Alaska Airlines, Frontier Airlines or Delta Air Lines is available. For flights with stopovers, Alaska Airlines, Southwest Airlines, United Airlines, American Airlines or Delta Air Lines is also an option.

The flight time between Ontario Airport (ONT) and Seattle Tacoma International (SEA) is approximately 2 hours and 40 minutes. The distance between the two airports is 1439 miles (or 2315 kilometers).

Yes, you can fly non-stop to SEA from ONT with Alaska Airlines, Frontier Airlines or Delta Air Lines.

A codeshare agreement means that cooperating airlines are able to sell seats on each other’s flights. This means that you are able to travel to more destinations than your airline of choice normally offers. Codeshare flights are also beneficial because of the seamless transits you can get with connecting flights from the same airline. The downside of choosing a codeshare flight can be that you in some cases can’t upgrade codeshare flights or use elite benefits.

A connecting or transit flight means that you reach your final destination through two or more flights – in other words a non-direct flight. You will change to a new aircraft after your first flight, this may include moving to another terminal at the airport aswell. The time required to transfer passengers and luggage between flights is called Minimum Connecting Time (MCT) and are always taken into account here on Flightroutes.com.

If you bought your whole flight on a single ticket, the airline will book you on the next available connecting flight.

With connecting flights, checked in luggage is most commonly forwarded to your final destination when buying a single ticket for both flights.

If you miss your connecting flight due to circumstances outside your control such as your first flight being delayed, you should turn to your airline who will provide you with a seat on the next available flight. This is usually done free of charge, and only applies if you purchased your trip as one ticket. If the next connecting flight is the following day, the airline usually provides accommodation and meals.
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