$69+ Cheap flights from Ontario to Seattle (ONT - SEA)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Ontario to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.The best prices from Ontario to Seattle/Tacoma Intl are usually found in October or September, booked 89 days in advance, depart on a Friday or Saturday and return on a Tuesday
Cheap flight deals from Ontario to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated enero 23, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $106 (Cheapflightsfares) |
One-way from | $69 (Cheapflightsfares) |
Popular in | December |
Cheapest in | October |
Average price | $177 |
Good round-trip deal | $175 or less |
Good one-way deal | $127 or less |
Find flight deals from Ontario to Seattle
Cheapest flights from Ontario to SeattleExplore the most affordable flight options available from Ontario to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 23, 2025.
Explore the most affordable flight options available from Ontario to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 23, 2025.
This Cheapflightsfares deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Expedia deal was found by Cheapflights users on 1/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Alaska Airlines deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Southwest deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This American Airlines deal was found by Cheapflights users on 1/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Find flights from Ontario to Seattle within your budget
Customize your flight search to find flights from Ontario to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated enero 23, 2025.
Fly from
Fly to
Route
Depart
Return
Price
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
vie. 2/21
11:25 am-2:16 pm
Nonstop2h 51m
Seattle/Tacoma Intl
vie. 2/28
1:36 pm-4:13 pm
Nonstop2h 37m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
mar. 2/25
6:00 am-8:50 am
Nonstop2h 50m
Seattle/Tacoma Intl
jue. 2/27
12:52 pm-3:29 pm
Nonstop2h 37m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
mar. 4/22
11:46 am-2:31 pm
Nonstop2h 45m
Seattle/Tacoma Intl
mar. 4/22
5:55 pm-8:29 pm
Nonstop2h 34m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
sáb. 3/1
4:05 pm-7:00 pm
Nonstop2h 55m
Seattle/Tacoma Intl
lun. 3/3
7:45 pm-10:32 pm
Nonstop2h 47m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
vie. 2/14
5:10 pm-12:25 am
1 stop7h 15m
Seattle/Tacoma Intl
dom. 2/16
6:55 am-11:05 am
1 stop4h 10m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
sáb. 3/1
7:40 pm-12:55 am
1 stop5h 15m
Seattle/Tacoma Intl
lun. 3/3
3:24 pm-8:40 pm
1 stop5h 16m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
mar. 2/4
6:10 am-2:02 pm
1 stop7h 52m
Seattle/Tacoma Intl
jue. 2/6
6:10 am-12:06 pm
1 stop5h 56m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
dom. 2/2
11:27 am-2:18 pm
Nonstop2h 51m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
mié. 3/5
6:00 am-8:50 am
Nonstop2h 50m
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
mié. 2/26
6:00 am-8:55 am
Nonstop2h 55m
Compare providers for flights from Ontario to Seattle
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Seattle in January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Ontario with our price prediction graph.
Travel insights for flights from Ontario to Seattle
Get recent, data-driven insights about flights from Ontario to Seattle including ideal travel times, pricing trends, and more.
How far ahead should I book a flight from Ontario to Seattle?
Use this chart to determine the optimal time to book a round-trip flight from Ontario to Seattle. Price data was last updated on January 17, 2025.
To ensure you get the cheapest price possible for a flight from Ontario to Seattle, you should look to book at least 89 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Ontario to Seattle?
Currently, January is the cheapest month in which you can book a flight from Ontario to Seattle (average of $238). Flying from Ontario to Seattle in July is currently the most expensive (average of $411). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to SEA?
Find hourly flight availability from Ontario to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated enero 23, 2025.
It’s typically best to fly out from Ontario to Seattle in the morning. Doing so could potentially save you 40% on the flight price compared to flying at noon, which is usually more expensive.
What is the cheapest day to fly from Ontario to Seattle?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Seattle. Price data was last updated on January 21, 2025.
Travelers seeking maximum savings on their Ontario to Seattle flight should consider departing on Friday mornings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Ontario to Seattle
Explore weekly flight availability from Ontario to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated enero 23, 2025.
The most flights from ONT to SEA are scheduled on a Thursday (18 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (9 on average).
Rainfall in Seattle by month
Plan your trip to Seattle by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.
Temperature in Seattle by month
Plan your trip to Seattle by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated enero 23, 2025.
Read reviews from past customers who have flown Frontier, Alaska Airlines and Delta from Ontario to Seattle. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
Boarding
Entertainment
Overall
Food
Comfort
Reviews
Sheila did great! First time I have ever seen all three people in an exit row get out and read the safety information card AFTER the briefing. I like the boarding process. It seems a shame to UN-differentiate SW because of abuse of the early boarding process.
Crew
Boarding
Entertainment
Overall
Food
Comfort
Reviews
Sheila did great! First time I have ever seen all three people in an exit row get out and read the safety information card AFTER the briefing. I like the boarding process. It seems a shame to UN-differentiate SW because of abuse of the early boarding process.
Crew
Boarding
Entertainment
Overall
Food
Comfort
Reviews
Sheila did great! First time I have ever seen all three people in an exit row get out and read the safety information card AFTER the briefing. I like the boarding process. It seems a shame to UN-differentiate SW because of abuse of the early boarding process.
Crew
Boarding
Entertainment
Overall
Food
Comfort
Reviews
Sheila did great! First time I have ever seen all three people in an exit row get out and read the safety information card AFTER the briefing. I like the boarding process. It seems a shame to UN-differentiate SW because of abuse of the early boarding process.
Crew
Boarding
Entertainment
Overall
Food
Comfort
Reviews
Sheila did great! First time I have ever seen all three people in an exit row get out and read the safety information card AFTER the briefing. I like the boarding process. It seems a shame to UN-differentiate SW because of abuse of the early boarding process.
Crew
Boarding
Entertainment
Overall
Food
Comfort
Reviews
Sheila did great! First time I have ever seen all three people in an exit row get out and read the safety information card AFTER the briefing. I like the boarding process. It seems a shame to UN-differentiate SW because of abuse of the early boarding process.
Related info for your journey
Find useful and relevant information for your journey from Ontario to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Ontario?
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Alternative routes for Ontario to Seattle
See prices for flight routes from nearby airports that may be better suited for you.
Top 4 airlines flying from Ontario to Seattle
Discover the top 4 airlines that operate flights from Ontario to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated enero 23, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$62 | Average$140 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$71 | Average$130 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$104 | Average$253 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$131 | Average$262 | FlexibilityNo cancel fee | On-time75% |