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Find cheap flights from Seattle to St. Charles from $59

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to St. Charles departing on 9/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Thu 6/27
Thu 7/4

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Good to know

Low season

January

High season

April

Cheapest flight

$59
Best time to beat the crowds with an average 31% drop in price.
Most popular time to fly with an average 1% increase in price.
Flight from Seattle to St. Louis

When to book flights from Seattle to St. Charles

Are your dates flexible? Find out the best times to travel from Seattle to St. Charles based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

FAQs for booking flights from Seattle to St. Charles

  • Which airports will I be using when flying from Seattle to St. Charles?

    When flying out of Seattle you’ll be using Seattle/Tacoma Intl. St. Charles does not have its own airport so you’ll be flying into nearby Lambert-St Louis airport, which is 7.2 mi away.

  • How long does a flight from Seattle to St. Charles take?

    Direct flights cover the 1,704 miles separating Seattle and St. Charles in about 3h 49m.

  • How many flights are there between Seattle and St. Charles?

    15 direct flights run between Seattle and St. Charles on a daily basis. On average, there are about 109 departures each week.

  • What’s the cheapest day of the week to fly between Seattle and St. Charles?

    Consider leaving on a Wednesday and avoid Mondays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Tuesdays and the most expensive ones on Saturdays.

  • How does KAYAK find such low prices on flights from Seattle to St. Charles?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to St. Charles.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to St. Charles?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Charles from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to St. Charles?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Charles with an airline and back to Seattle with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to St. Charles?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Charles from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which airlines provide the cheapest flights from Seattle to St. Charles?

    In the last 72 hours, the cheapest one-way ticket between Seattle and St. Charles found on KAYAK was with Spirit Airlines for $59. Spirit Airlines offered a round-trip connection from $150 and Frontier from $179.

See more FAQs

Top tips for finding cheap flights from Seattle to St. Charles

  • There is no airport in St. Charles. Instead, you’ll be flying into St. Louis Lambert Airport when flying between Seattle and St. Charles.
  • The cheapest flight from Seattle to St. Charles was found 71 days before departure, on average.
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be June, July and August. The cheapest month to fly is January.
See more tips

Top 5 airlines serving Seattle to St. Charles

 
Need help choosing which airline to fly with from Seattle to St. Charles? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9192 reviews
8.2Boarding
7.9Comfort
7.3Food
7.3Entertainment
8.6Crew
Airline reviews

The boarding gate is literally just an aisle to the concourse. There is no seating and it's shared with several other airlines. It's crowded, hot, and standing-room only. It's difficult to hear gate announcements over the PA system with too many other carriers crammed into a small space. I've enjoyed flying AA in the past on the west coast, but the BNA single gate experience is horrendous! Never again from BNA to SEA with AA.

4.0 OkayBrent, May 2024SEA - BNA
Read more about Alaska Airlines reviews

The boarding gate is literally just an aisle to the concourse. There is no seating and it's shared with several other airlines. It's crowded, hot, and standing-room only. It's difficult to hear gate announcements over the PA system with too many other carriers crammed into a small space. I've enjoyed flying AA in the past on the west coast, but the BNA single gate experience is horrendous! Never again from BNA to SEA with AA.

It was a partial full flight. But even with a spare seat it was hard to get comfortable More on me being a wide body probably

Our flights using Alaska Airlines went great! All of the flight attendants were very friendly. Big shout out to the pilots for getting us to and from our destinations safely!

I can’t complain. Perhaps passing out headphones, but it was on me to bring my own since I could have used some for my personal device.

I liked only the crew. The flyght was too much fast, faster than it should be, on 20 min faster, but not safer, I experienced on myself astranautic overload from suddenly appearing in the sky and all the vibrations of the turbines, because I had my place at the level of the wings. Pregnant woman should not be seated on the level of the wings with all turbines, pregnant woman should be offered to charge place to seat closer to front or in the back, but not at the level of all the turbines. Vibrations of turbines are not healthy for pregnancy. I hold all the flight my belly in my hands to avoid miscarriage. If it would be longer flying distances, I could have miscarriage with Alaskan airlines.

I didn't have food or use entertainment, so those evaluations are invalid.

I do not feel the priority seating I paid for was was adequate for the cost. there was no difference from coach on any other airline, and it was very uncomfortable

First flights on Alaska Air, and I will go out of my way to fly them whenever I can in the future. An incredible experience, above and beyond any other airline.

It was warm on the plane. Perhaps the people who were coughing quite often should be encouraged to wear a mask?! It was a long 4 hours.

Why do you ask about food when only a snack is served? Actual food needs to be bought.

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

Had a broken tray in business class. Crew just shrugged it off.

Everything was great except for the seat. The backrest would not stay in the upright position.

public website still broken for years randomly blocking browsers with privacy options active after loading a page maybe once. check-in on laptop was almost impossible but eventually randomly worked. had to print pass at airport since couldn't get back in to load digital pass on mobile firefox or chrome. red eye flight so smooth onboarding, plenty of room to spread out, easy offboarding. onboard wifi instructions mention vpn can cause problems connecting but fails to also mention private dns. no printed or built in menu list, seems weird to require personal device to point at qr code link for menu which does not even allow direct ordering. people with health condition risk related dietary restrictions trying to avoid for example cholesterol and sugar are left guessing what they can order either way without nutritional info highlights (cranberry juice was minute maid cocktail with as much suger as typical can of soda). tap to pay wasn't working and always seems sketchy to manually enter card info. good movie variety, so limited tv was okay.

Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.

Flight diverted in SD. Later take off in Seattle by 1.3hrs

Mi primera conexión se retrasó por lo cual perdí mi segunda conexión la cual salió adelantada

Crew was not friendly when I went to request a seat change.

There were choices for the snacks. Good choices and tasty lunch and breakfast as well.

The flight crew was amazing. I’m very tall and they moved me to an exit row unsolicited!!! Amazing service.

Dinner was okay but the breakfast was not eatable on the flight San Francisco to Zurich.

There was no screens on board AND the WiFi didn’t work. My seat was broken and couldn’t recline so I couldn’t even sleep. The flight attendants didn’t offer anything to make it more comfortable. It was such an old cramped plane, when the person in front of me reclined I couldn’t even open my tray table. All the United ads talk about guaranteeing everyone gets a screen!

The Wi-Fi was unavailable on this flight for some reason.

On time take off…US cabins look tired and need of refresh!

Fantastic. Smooth boarding with an infant. Never experienced it with any other carriers.

This was a Lufthansa flight, not United. The CSA at the counter, Ashley, was not only incompetent, but quite rude. Me and two other PAX waited over 7 minutes standing in front of her and another CSA and they ignored us. We joked that we must have accidently taken invisibility pills. She could have at least said "I'll be with you in a moment, I'm currently....". I could go on about how rude she and the other CSAs were (whispering, not communicating with me, blaming the situation on others, etc.). She would not work for me. Then, she gave me literally the worst seat on the plane. the worst. My seat kept getting bumped (rammed twice by the crew with their carts and about every 5 minutes by someone using the bathroom), listening to the bathroom all night, crowded seat, etc.

My seat was broken. WiFi didn’t work. Gate crew at HOU were rude and condescending. Treated all the passengers badly. Bad experience, United.

First flight of the day… MINIMUM FUEL! 15 minute landing delay at HOU due to fog turned into a 2+ hour delay! Rather than circle, they had to divert to another city to refuel! Sat on tarmac at Austin to refuel. We ALL missed our connections! The crew, including pilots, were clueless. Crew was really a mess. At HOU, Untied employees were exceedingly rude to all. It was pitiful.

An hour and a half late is UNACCEPTABLE. The negative impact to our family is unconscionable. And for the price we were forced to pay...

No lounge access with “United First” ticket. False alarm about late flight, jeopardizing connection. Wrong meal. Loose power socket would not hold plug, could not charge device. In-flight access to text messaging did not work. Toilet seat on plane would not stay up.

The boarding process and flight were great. However, I waited about 40 minutes for my luggage. It did not come up on the designated belt. Instead, everyone’s bags were on a cart. Not sure what the issue was, but we were not informed until another passenger went looking for her bags and found them.

There were delays on both ends. It made it less than excellent. This plane was great though

AA1537 the AC was not working properly. It was very hot and uncomfortable.

Worst experience flying American Airlines. I fly with them often, so I was super disappointed in the service I received at gate 30 in LGA on May 24, mid-day. The flight was delayed twice. I was patiently waiting in the American Airlines lounge when I received the notice on my app that the plane was boarding 45 minutes before its newly re-scheduled take off of 4 pm (from the orginal 1:45 pm then 3:00 pm). It took me 5 min to travel from the lounge to the gate and when I arrived there at 3:20 flight gate attendant told me the flight had closed and that they announced for passengers multiple times. I showed them the notification on my app and they were really rude and unempathetic. The person who rescheduled my flight at customer service wasn't any happier but was at least helpful in getting me on the next flight.

Flight was 1/2 hour delayed leaving Phoenix. Otherwise it was an average flight. Flight crew on this trip was very nice.

Everything was great except for the wifi was junk. Crew was super friendly and helpful

Was lucky to have a employee at the AA checkin counter that had compassion and understood they ordeal that we went through with our original flight being diverted, needing to stay in the aircraft and then flying to the original destination; adding hours to the trip and forcing us to miss our connection and our rebooked connection. She was able to get up on standby on the highest priority on the next flight to the closest airport we need to be at and it all worked out despite being many hours late.

Delayed so that missed connecting flight. Connecting flight was also delayed on the tarmac but they closed the gate before the rescheduled time.

Attendants were rude. Scowling. Seats were miserable and we paid extra.

Took off over an hour late with multiple mechanical issues. Gate agent in Dallas was lazy and was slow as molasses. Had a line 10 people long. Spirit bad..

It was ridiculously hard to check in for the flight, and Frontier charged us a LOT of money to have a carry on suitcase, and then told everyone we could not carry on bags and had to check them through at the gate, and didn't refund the extra money we paid to have the suitcase as carry on.

I had a terrible experience with Frontier. I arrived before the 60 minute cut off and was told that Frontier has a two hour window for bags. I was then told the next available flight wasn’t until the end of the day (I had booked a 6am flight). I took a look around and saw other people being told that they could not board their flights or that they had to pay additional fees. I opted to rebook on American Airlines. There’s absolutely no straightforward way to contact Frontier, so this ticket was a complete waste of money. Oh - and the kicker is that the lady lied about the two hour cut off.

Frontier won’t help you at the airport without paying $25. Carry on was $75. Then you get on the plain and every beverage or snack is also a charge. Seats are hard and real packed in. I would never fly them again.

Worst experience I have seen. The flight was cancelled without any reason.

My experience with frontier staff at the Denver airport was absolutely horrible. The manager on duty was even worst if was the worst experience I have ever had, I have never been treated so poorly as a customer in my life! The staff was extremely rude, eye rolls and attitude and then refusal to help me at all. I wish I could never fly frontier again that’s how horrible it was!

The Frontier app wasn’t working. So I could not pay for a carry on the week prior to flying. They charged me 99$ at the gate to carry on a duffle bag.

Good for the price. My only complaint is that the pilot should keep the air flowing while passengers are waiting to getting out of airplane.

Plane could have been more on time. More leg room .

I arrived 1 hour prior to boarding, and they said I was too late for a domestic flight. First time I heard that :-(

Check in online was easy. Seats aren’t very comfortable

Book cheap flights from Seattle to St. Charles

Recent round-trip flight deals

9/4Wed
1 stopSpirit Airlines
29h 50mSEA-STL
9/9Mon
1 stopSpirit Airlines
19h 43mSTL-SEA
$150
9/4Wed
2 stopsSpirit Airlines
22h 28mSEA-STL
9/9Mon
1 stopSpirit Airlines
23h 43mSTL-SEA
$161
8/24Sat
1 stopFrontier
12h 27mSEA-STL
8/31Sat
1 stopFrontier
14h 37mSTL-SEA
$179
9/19Thu
1 stopFrontier
12h 27mSEA-STL
9/22Sun
1 stopFrontier
17h 19mSTL-SEA
$188
10/1Tue
1 stopAmerican Airlines
7h 42mSEA-STL
10/8Tue
1 stopAmerican Airlines
8h 37mSTL-SEA
$195
10/4Fri
1 stopAmerican Airlines
8h 43mSEA-STL
10/8Tue
1 stopAmerican Airlines
8h 37mSTL-SEA
$211
10/2Wed
1 stopDelta
9h 27mSEA-STL
10/7Mon
1 stopDelta
7h 00mSTL-SEA
$221
8/7Wed
1 stopDelta
8h 46mSEA-STL
8/13Tue
1 stopDelta
7h 29mSTL-SEA
$226
8/26Mon
nonstopAlaska Airlines
3h 56mSEA-STL
9/3Tue
nonstopAlaska Airlines
4h 26mSTL-SEA
$277
8/21Wed
nonstopAlaska Airlines
3h 51mSEA-STL
8/25Sun
nonstopAlaska Airlines
4h 24mSTL-SEA
$297

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Recent one-way flight deals

9/10Tue
2 stopsSpirit Airlines
15h 46mSEA-STL
$59
8/13Tue
1 stopSpirit Airlines
11h 52mSEA-STL
$78
10/19Sat
1 stopAmerican Airlines
8h 05mSEA-STL
$97
6/15Sat
1 stopFrontier
10h 00mSEA-STL
$98
6/22Sat
1 stopFrontier
9h 00mSEA-STL
$110
9/30Mon
1 stopAmerican Airlines
6h 53mSEA-STL
$113
7/12Fri
1 stopDelta
8h 25mSEA-STL
$124
9/30Mon
nonstopAlaska Airlines
3h 51mSEA-STL
$159
6/19Wed
nonstopAlaska Airlines
3h 50mSEA-STL
$189
6/26Wed
1 stopDelta
6h 04mSEA-STL
$333

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Last minute flights from Seattle to St. Charles

Last minute flight, train and bus deals

6/1Sat
multi-stopFrontier
22h 24mSEA-STL
6/3Mon
multi-stopFrontier
13h 34mSTL-SEA
$185
6/1Sat
multi-stopFrontier
22h 24mSEA-STL
6/3Mon
multi-stopFrontier
18h 53mSTL-SEA
$190
5/29Wed
multi-stopDelta
8h 30mSEA-STL
6/3Mon
multi-stopDelta
7h 09mSTL-SEA
$276
5/29Wed
multi-stopAmerican Airlines
9h 13mSEA-STL
6/2Sun
multi-stopAmerican Airlines
7h 57mSTL-SEA
$356
5/31Fri
multi-stopAmerican Airlines
7h 20mSEA-STL
6/2Sun
multi-stopAmerican Airlines
7h 28mSTL-SEA
$357
5/30Thu
multi-stopUnited Airlines
7h 43mSEA-STL
6/2Sun
multi-stopUnited Airlines
6h 52mSTL-SEA
$407
5/29Wed
multi-stopUnited Airlines
9h 10mSEA-STL
6/2Sun
multi-stopUnited Airlines
6h 52mSTL-SEA
$412
5/30Thu
nonstopAlaska Airlines
3h 59mSEA-STL
6/3Mon
nonstopAlaska Airlines
4h 19mSTL-SEA
$667
5/29Wed
nonstopAlaska Airlines
3h 58mSEA-STL
6/2Sun
nonstopAlaska Airlines
4h 14mSTL-SEA
$827
6/2Sun
multi-stopDelta
8h 30mSEA-STL
6/6Thu
multi-stopDelta
5h 58mSTL-SEA
$1,053

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Flights to St. Charles