Cheap flights from Pennsylvania to St. Louis from $59
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Pennsylvania to St. Louis departing on 9/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Spirit Airlines flights from Pennsylvania to St. Louis
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American Airlines flights from Pennsylvania to St. Louis
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How to get the cheapest flight ticket from Pennsylvania to St. Louis
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to St. Louis?
In general, August is the cheapest month to fly from Pennsylvania to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $226. The month of July is another great option to travel to St. Louis, with average flight prices from Pennsylvania averaging around $271.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $382. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $463. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
What is the cheapest time of day to depart on your flight to St. Louis?
Flying to St. Louis from Pennsylvania at noon is the least expensive time of day to depart. momondo users have found prices as low as $369 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $414 per ticket.
What is the cheapest Pennsylvania to Lambert-St Louis flight route?
Fly from Philadelphia to Lambert-St Louis for the best Pennsylvania - Lambert-St Louis flight prices
How far in advance should I book a flight to St. Louis?
You are more likely to see cheaper flights to St. Louis from Pennsylvania when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $364 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Pennsylvania for as low as $307 on momondo.
What cabin class options are available on Pennsylvania to Lambert-St Louis flights?
There are 3 cabin classes available to choose from on Pennsylvania to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Pennsylvania to Lambert-St Louis?
Spirit Airlines, United Airlines, and American Airlines are the most popular carriers operating from Pennsylvania to Lambert-St Louis
What airlines fly to St. Louis?
American Airlines, Southwest and Frontier are the top three most popular airlines that fly to St. Louis from Pennsylvania according to our data. American Airlines is the first choice among our users, with 59% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
How many flights depart from Pennsylvania to St. Louis on average per day?
As of June 2025, there are 27 flights per day flying from Pennsylvania to St. Louis. The most common time of day flights depart is 6:00PM, with 46% of flights taking off in the evening.
How many flights depart from Pennsylvania to St. Louis on average per week?
As of June 2025, there are 195 flights per week flying from Pennsylvania to St. Louis. The most common day of the week flights depart is Wed, with 24% of flights taking off on this day.
Cheap Pennsylvania to St. Louis flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Pennsylvania to St. Louis
When did momondo last update prices for flights from Pennsylvania to Lambert-St Louis Airport?
Prices for flights from Pennsylvania to Lambert-St Louis Airport refresh daily.
How many operators does momondo search for flights from Pennsylvania to Lambert-St Louis Airport?
As of June 2025, there are 6 operators available to choose from for flights from Pennsylvania to Lambert-St Louis Airport.
How old do you have to be to fly from Pennsylvania to Lambert-St Louis Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Pennsylvania to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Pennsylvania to St. Louis?
Based on momondo bookings for flights between Pennsylvania and St. Louis, the leading plane model is Airbus A319, making up 24.15% of the total bookings. Other popular models include Boeing 737 MAX 8 with 17.93%, Boeing 737-800 Passenger/BBJ2 (winglets) with 14.97%, and Boeing 737-700 Passenger/BBJ1 (winglets) with 11.57%.
Best airlines flying from Pennsylvania to St. Louis
Compare and see reviews for airlines that fly from Pennsylvania to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $48 | Free Cancellation | Rating 5.9 3,296 reviews | |||
| PriceFrom $162 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $200 | Free Cancellation | Rating 8.0 7,965 reviews | |||
| PriceFrom $236 | Free Cancellation | Rating 7.4 8,840 reviews | |||
| PriceFrom $247 | Free Cancellation | Rating 8.0 4,278 reviews |
Traveling to a place near St. Louis?
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Why should I use momondo to find a flight deal from Pennsylvania to St. Louis?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Pennsylvania to St. Louis. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Pennsylvania to St. Louis with flexible booking policies on momondo?
momondo does allow users to show only those flights to St. Louis from Pennsylvania which offer a flexible booking policy as well as other useful filters and features.
How can momondo help me find flights from Pennsylvania to St. Louis?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from Pennsylvania.
I’m not ready to book a flight from Pennsylvania to St. Louis right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to St. Louis from Pennsylvania. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.