Cheap flights from Illinois to Lisbon from $294

In general, February is the cheapest month to fly from Illinois to Lisbon. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $360. If you are unable to visit Lisbon during the month of February, then departing from Illinois during the month May is also very affordable. Most momondo users find prices during this month for around $370.

Our data shows that Wednesday is the least expensive day to fly to Lisbon. Tickets to fly out on this day can be as low as $615. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to Lisbon for around $814.

The cheapest time of day to fly to Lisbon is in the evening when flights can be purchased for as low as $582. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $773 on average. Flights to Lisbon from Illinois in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Chicago O'Hare Intl to Lisbon Humberto Delgado for the best Illinois - Lisbon Humberto Delgado flight prices

You are more likely to see cheaper flights to Lisbon from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Lisbon for around $802 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Lisbon from Illinois for as low as $655 on momondo.

There are 3 cabin classes available to choose from on Illinois to Lisbon flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Aer Lingus, British Airways, and Delta are the most popular carriers operating from Illinois to Lisbon Humberto Delgado

TAP AIR PORTUGAL, United Airlines and British Airways are the top three most popular airlines that fly to Lisbon from Illinois according to our data. TAP AIR PORTUGAL is the first choice among our users, with 65% of people opting to fly with this airline when traveling to Lisbon. Keep in mind that there are 17 different airlines that fly to Lisbon on a routine basis, so you have a few additional options to choose from.

As of June 2026, there are 1 flights per day flying from Illinois to Lisbon. The most common time of day flights depart is 6:00PM, with 100% of flights taking off in the evening.

8 flights are operational weekly from Illinois to Lisbon as of June 2026. The most popular departure day for this route is Wed, with 25% of flights per week taking off on this day.