The Dublin–London air route is one of Europe’s busiest for good reason: it’s quick, frequent, and surprisingly affordable if you know when to book. With more than 20 daily flights and one-way fares starting at €15, the challenge isn’t finding a flight; it’s picking the right one at the right price. This guide breaks down the real costs, airline differences, and timing strategies that can save you more than just a few euros.

4 related posts

Cheapest one-way fare: €15 (Skyscanner) ·
Ryanair daily flights: 16 ·
Flight time: 1h 25m (direct)

Quick snapshot

1Confirmed facts
2What’s unclear
  • Whether Tuesday is always cheapest across all airlines
  • Exact price variation by season for each airport pair
  • Which budget airlines include carry-on bags without extra fees
3Timeline signal
4What’s next
  • Set price alerts on Skyscanner for your preferred London airport
  • Consider flying to Gatwick or Stansted for the lowest fares
  • Book on a Tuesday – but verify with airline-specific data

Five key figures capture the essence of this route:

Metric Value
Shortest flight time 1h 25m (DUB-LHR)
Cheapest one-way €15 (Ryanair)
Most frequent airline Ryanair (16 daily)
Total daily flights Over 20
Main London airports LHR, STN, LGW, LTN, SEN, LCY

What is the cheapest day of the week to fly to London?

Comparing midweek vs weekend fares

  • Tuesday and Wednesday are often the cheapest days (Skyscanner (travel search engine)). Data shows midweek departures can be up to 40% cheaper than Sunday flights.
  • Friday and Sunday flights are the most expensive, driven by business and leisure demand.
  • Flexible date search on aggregators like Google Travel (price comparison tool) shows that shifting by just one day can make a big difference.
The paradox

Cheapest day varies by airline. Ryanair’s cheapest day might not align with Aer Lingus’s. Always check both if you have a preference.

Bottom line: Tuesday and Wednesday yield the lowest fares. Business travellers on Friday and Sunday pay a 30-40% premium. Budget-seekers: use flexible date search.

Data from Skyscanner and Google Flights

  • Skyscanner reports that travellers who search on a Tuesday often see the lowest published fares.
  • Google Flights’ insights confirm that midweek departure is typically cheaper.

The implication: if you can avoid Friday and Sunday departures, you can save up to €40 per way.

How much would it cost to fly from Dublin to London?

One-way and return fare examples

Budget airlines vs full-service carriers

  • Ryanair: €15–€35 one-way, but baggage fees apply.
  • Aer Lingus: €31–€139 one-way, includes a carry-on bag.
  • British Airways: €115–€200 one-way, full service with seat selection.
Why this matters

The advertised fare isn’t the final price. Ryanair’s €15 fare excludes luggage and seat assignment; add €20–€30 for a checked bag. Aer Lingus’s €31 fare includes a small cabin bag but charges for checked luggage. The trade-off: budget airlines win on headline price, full-service carriers on included perks.

Bottom line: Expect to pay €15–€50 one-way on Ryanair, €31–€139 on Aer Lingus, and €115+ on British Airways. Aggregator tools like Skyscanner and KAYAK give real-time comparisons.

Which month is the cheapest to fly to London?

Seasonal price trends

  • January is the cheapest month: average return $40 (KAYAK (flight data analytics)).
  • November is the most expensive: average return $429.
  • December also peaks at $356.

Peak vs off-peak months

  • Summer (June–August) sees higher demand, with typical one-way fares above €70.
  • Spring and autumn offer moderate prices, often between €30 and €60.

What this means: January flights are about 90% cheaper than November flights. If you can travel in winter, you save dramatically.

How long is the flight from Dublin to London?

Direct flight times to different London airports

Factors affecting flight duration

  • Wind and air traffic control can add 15–20 minutes.
  • All flights are direct; layovers are not typical on this route.

The catch: despite short flight time, factor in at least 2 hours pre-departure for security and boarding.

Which airlines fly from Dublin to London?

Ryanair – budget option with multiple frequencies

  • 16 daily flights to STN, LGW, LTN, SEN (Ryanair (budget airline))
  • One-way from €15
  • Baggage fees extra; no free seat selection

Aer Lingus – full-service to Heathrow and London City

British Airways and other carriers

The trade-off

Ryanair gives you more flights and lower headline fares. Aer Lingus gives you Heathrow access and a smoother experience. BA offers full service but at a high price. Choose based on your baggage needs and destination airport.

The pattern: Ryanair’s high frequency forces competitors to stay competitive on price, especially to secondary London airports.

Upsides

  • Very short flight time (~1h 25m)
  • Extremely low fares available (from €15)
  • Multiple airport options in London
  • High frequency (over 20 daily flights)

Downsides

  • Budget airlines charge extra for bags and seat selection
  • Peak-season prices can be 10x higher
  • London airport choice affects onward travel time
  • Flight delays possible due to air traffic

How to find cheap flights from Dublin to London

These steps combine aggregator tools with airline-specific checks to land the best deal.

  1. Set price alerts on Skyscanner (travel search engine) for your preferred airports.
  2. Use flexible date search to compare a whole month.
  3. Consider less popular airports like Luton or Southend for lower fares.
  4. Book in advance: 2–4 weeks for best deals.
  5. Check airline-specific fees for luggage and seat selection before booking.

The pattern: travellers who combine weekday departures with secondary airports routinely save 40-60% over peak-time Heathrow flights.

What’s clear and what’s not

Confirmed facts

  • Ryanair operates 16 daily flights to London (KAYAK (flight aggregator))
  • Direct flight DUB–LHR is 1h 25m (Aer Lingus (Irish full-service carrier))
  • Cheapest one-way fare €15 (Skyscanner (travel search engine))
  • January is cheapest month ($40 return) (KAYAK (flight data analytics))

What’s unclear

  • Whether Tuesday is cheapest airline-specific
  • Exact seasonal price variation by airport pair
  • Carry-on inclusion for budget airlines

“The cheapest one-way flight from Dublin to London was €15, often available on Ryanair.”

— Skyscanner travel insights, Skyscanner (travel search engine)

“The cheapest return flight on the Dublin–Gatwick route was $38, 58% cheaper than other routes.”

— KAYAK data, KAYAK (flight aggregator)

For the smart traveller, the Dublin–London route is a textbook case of how frequency and competition drive prices down. Ryanair’s 16 daily flights force other carriers to stay competitive, especially on the budget end. The real saving comes from timing: January is 90% cheaper than November, and midweek is 40% cheaper than Sunday. For the leisure traveller based in Dublin, the choice is clear: book midweek in January, fly to Gatwick or Stansted, and skip add-ons you don’t need.

Additional sources

expedia.com, travelupdate.com, skyscanner.com, skyscanner.com

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Frequently asked questions

Can I bring a carry-on on Ryanair flights?

Ryanair allows one small personal bag for free (40x20x25cm). A larger cabin bag (10kg) costs extra. (Ryanair (budget airline))

How far in advance should I book a flight to London?

Typically 2–4 weeks for domestic-style routes. For peak summer or Christmas, book 6–8 weeks ahead to avoid price spikes.

What is the cheapest airport to fly into from Dublin?

Gatwick and Stansted tend to be cheapest. KAYAK data shows Gatwick return as low as $38. (KAYAK (flight aggregator))

Are there direct flights from Dublin to London City Airport?

Yes, Aer Lingus operates direct flights to LCY (London City). Flight time is about 1h 25m.

What is the cancellation policy for Aer Lingus flights?

Aer Lingus offers flexible fare options including free cancellation within 24 hours of booking. Standard fares have change fees. Check their website for details.

Do I need a passport for flights from Dublin to London?

Due to the Common Travel Area, Irish citizens can travel with a valid passport or passport card. UK and Irish citizens do not need a visa. (UK Government (immigration guidance))